Classic Industries offers a wide selection of Pontiac Firebird parts, including Pontiac Firebird interior parts and soft trim, Pontiac Firebird exterior sheet metal, Pontiac Firebird moldings, Pontiac Firebird emblems, Pontiac Firebird weatherstrip and unique accessories, to nearly every nut and bolt needed for installation. no more hesitation or bog when you snap open the throttle from idle. But it bogs badly when. 2000 Tundra R Bogs at Full Throttle - posted in Freestyle / Legend / Tundra / Expedition Sport: Hi All, Im having a little trouble with a 2000 Tundra R. Vacuum secondary carburetor bogging If the engine is sluggish in response at full throttle then the secondaries may not be opening soon enough. hey man yeah id have to say deff a fuel problem "clogged line" "too much oil" or a carb problem,i just got a 2001 2 stroke 90cc quad and it ran like $#!t always died out when i gave full throttle and constantly bogging and or dieing out/stalling,so im like the carb,took off the carb sprayed it down with carb/choke cleaner and blew it out with an air compresser hose make shure to complety. Got annoyed with a lifter tick after numerous time setting the valve lash. The truck starts, idles, and revs normally and when accellarating slowly everything works just fine, but once you get past half throttle it falls on its face and acts like it has a clogged fuel filter or bad fuel pump. It runs great upto 3/4 throttle but once i bar it the bike bogs right out. If it bogs on 1/8 to 1/4 of a turn then it was about right and you should leave it. If you attempt to accelerate too hard off idle, to the point where the secondaries kick in, the car bogs and stumbles to the point where it dies unless you lift your foot off the pedal. Full throttle trimmed up to plane and engine rpms went up and i got her going 35 mph. (hard acceleration) As the vacuum recovers the dashpot pulls the throttle linkage shut. I messed up by Full throttle Bogging down. Make sure the secondary air valve vacuum pull-off is hooked up and working and set to allow only about 1/32" of movement at idle. Install a good throttle return spring. Bog/Miss Todd: At the higher settings, it doesn't even take full throttle for the bog to occur. Is finding parts going to be a problem here or could I just strip it. In any case, loosen it until it bogs and 1/8 turn back from that and you should be right. I have recently developed a loss of power, or bogging at 3/4 to full throttle. Useing premium fuel with a 50:1 ratio. if you give it any throttle, especially if you "gun" it, it will either jump the rpms to just a little more than "idle" rpms, and then actually decrease rpms until it stalls, or if you let off the throttle it stablizes. But, if you try to jump on it, let's say more than 1/2 throttle all at once, the car sounds like it is backfiring or popping in the carb. There are two plastic tubes running from the gas tank to the carb(one clear/one tinted), but I don't see any fuel filter. Accelerates smoothly and with no problem. Once home the fuel tank was almost empty so I filled it with 91 octane and added about 4oz of seafoam. My engine bogs when full throttle is applied If this is your first visit, be sure to check out the FAQ by clicking the link above. Check for interference at the accelerator pump linkage. com Indica vista quadrajet manual pdf If a repair manual with adjustment specifications is available, refer to the. It ended up being just a crank relearn that needed to be done. I have no success removing the bog with secondary air valve tuning so far. It doesnt do it everytime i give it full throttle, but enough to really piss me off. Is it worth ripping off those limiter's and trying to richen the jetting? Or is this just what you get with a 33cc mini motor with a relatively large carb? Once it's out of. If the air valve opens too quickly, the engine will bog. 4) Main Jet – This circuit affects the mixture from 1/2 throttle to full throttle. The engine bogs down. Recently, my bike has been cutting out or bogging down at full throttle, Anything below half throttle is fine, but this is strange as it was fine a few days ago, was happy at fully throttle, but now when i open it up from a slow speed, the rev's will die out and stall, if i do it at high speed, it sounds like im chopping on and off the throttle. First one: I have a 4. its a 99 R6, stock air filter, slip on, factory pro 1. Any idea what could be causing this?. A Problem That Most Q-jets Are Known For Is Hard Starting A problem that most Q-jets are known for is hard starting when cold. I've been driving it, and if you accelerate slowly or just average, like getting into traffic, it's fine. Even the faintest flick of the trigger and it bogs down. Less Likely to Bog Down in Heavy Grass. These are the only 2 ways I have found that actually allow me to drill a hole now. he gave me the original carb with the bike and the newer carb thats on it now. tank and I add a bottle to a full tank every third tank or so. Still a bit sluggish if I go full throttle. To start this off, I just wanted to tell a little bit about the stock Q-jet that came on my truck (1985 C-10). The previous owner replaced the 305 with a Goodwrench 350. Bogs from 0 to 1/8th throttle, right off of idle, really. Firemanmike, I too have a quadrajet that I believe is a culprit, motor starts fine, throttles up good but only getting 2200 rpms out of engine. May backfire or. If I let off the throttle it would come back to life and then. Rochester Quadrajet 800cfm, new fuel filter and pump, less than 1200 miles on complete overhaul on engine and carb, No dwell capability in a HEI. I've got an ECU code, #34, knock sensor. Gearing can also be a significant factor. The code of manufacture is also at this location. They run a lot cooler when you're stuck in traffic. I also had a vacuum gauge hooked up in-line between the bulb and the motor. Ryobi CS30 bogs down when choke open I have a Ryobi CS30 trimmer that I am having some trouble with. Accelerates smoothly and with no problem. Engine starts great-no choke needed. seemed to be fine on flat ground but up hill gradually stalled again. the warmer it gets, the more pronounced the Bog. but i cant give it more than about 15-20% throttle. I turned the mixture screws all the way in and then set them around 2. *Removed carb and replaced all gaskets, now the snow blower will not start and I get NO gas in the carb. from a dead stop, when I step on the gas, i hear air intake, and then the rpms go down and then up and then the truck responds a second or so late. We carry a full line of moterhome, travel trailer, and wheel camper parts and accessories. I will give it full throttle but the bike will keep dropping speed or just hold the speed at ~65mph. If this is fixed, I will upgrade my current 3 star rating. with 50,000 coil i run 28 deg timing idle and 32. Hello, So I have a bit of a Frankenstein snowmobile. Next, I have a few drips of fuel leaking from either the throttle plate, or base plate of the carb, which I think shows that I have a vacuum leak. This thing runs great, starts every time and idles nice. 1985/86 Q-jets in U. Full Throttle then BOGGING, Check Engine, rough idle - Code Misfire cyl #1?? Jump to Latest Follow 1 - 3 of 3 Posts. So, I put a 1/4 rubber base gasket in place of the cheap, thin paper one. So just a quick update: I worked on the carb for a couple of hours today. Smooth engine operation and can get full throttle to about 4200 RPM. *Snow blower started right but was leaking gas out of the carb. 1st, here are my mods:. Ruckus bogs down when I try to accelerate. Car starts on a dime and drives great for about 10 mins just all of a sudden just bogs down and idles really low then finally stalls. I have fitted a SIP Road 2. but ive always had the problem with bogging but the backfire is new also when the car is just sitting in my drive way idleing i can press the gas and a little puff. willys_truck, Dec Also check for play in. In addition to this circuit, there is a tiny slot cut into the throttle opening on the primary side (and on all four barrels if the carburetor is equipped with four-corner idle mixture adjustment). I have replaced the entire carb, checked the fuel lines, checked the airbox, the tube from the engine to the fuel vacuum. QUOTE] I'm not sure I understand this part. ( some have still have to use the choke, some do not). Sounds like a plan. Just that a lot of tundra owners don't realize it. Aren't they supposed to open at full throttle? I'm no carb expert. The secondary vacuum-break is modified and installed to increase the opening of the secondary air door to eliminate bogging under rapid, hard throttle conditions. If the saw drops at full throttle, not. No tach, so I don't know what the actual RPM is, but it sounds a little low. 3) Replace the power valve. Try bending down the tip of the pump arm to take out the slack. 4v6 automatic, 4WD and for some reason, the truck is unresponsive and hesitates at full throttle, but as soon as I let off to about 3/4 throttle, I feel it pulling like it should, just doesn't really accelerate at full throttle, but revs up just fine. Few people realize that the Q-Jet has a strong racing heritage, particularly in N. The more I bury the throttle the more it bogs and losses power. Quarter or part throttle acceleration is fine and acceleration once the engine is up to 3000 rpm's and over is fine; no stumbles. if i let it idle again right after that it comes back and idles. A gentlemen ended up sending me a size 300 jet, i recently got around to putting it in the carb and doing a carb clean about a week ago. I'll be very surprised if you loosen beyond 3/4 of a turn of where it is now. I tried adding fuel in the low and mid load tables around that RPM, tried upped the boost and map enrich. Re: Engine Bogs at Full Throttle The Rochester Quadrajet has the Identification numbers stamped into the vertical boss on the driver's side secondary throttle shaft. Stage 2 OTS bogs & goes full rich at part throttle Hey, I finished the stage 2 setup on my 2004 WRX this weekend and I am now having drivability issues. Orangewrx · Registered. It runs and idles but when I give it full throttle it bogs down. spring, changed the power valve nothing helps it i checked the plugs they look just like the normal pic in the Haynes manual i have a HEI dist. After I let the engine warm up and move the choke lever to the open position and give it the gas, it just bogs down. It runs and idles but when I give it full throttle it bogs down. It’s almost as if it is getting too much gas on run with full throttle. 2002 WRX throttle response/ bogging problem. This is why the secondaries should remain closed. Stock everything, except 2 into 1 short pipes going down right side. hello i have a 1987 kdx-80 and bored, i went to my bike just to hear it rev up whilst in neutraland as soon as i opened up full throttle the bike bogs downdoes this everytime i get to full throttle, this some kind of built in measure to make sure i dont ruin engine or is something need work? could it just be a low gas issue?. It doesnt do it everytime i give it full throttle, but enough to really piss me off. Seems like 3/4 throttle is full throttle. What I'm seeing is that the engine just wants to bog down once I get to about 1/2 throttle. com Indica vista quadrajet manual pdf If a repair manual with adjustment specifications is available, refer to the. Problem CONDITION POSSIBLE CAUSE CORRECTION 3) Ford& Holley Only. (hard acceleration) As the vacuum recovers the dashpot pulls the throttle linkage shut. I've got an ECU code, #34, knock sensor. spring, changed the power valve nothing helps it i checked the plugs they look just like the normal pic in the Haynes manual i have a HEI dist. Upon throttle up, I then get backfire through the secondary on the carb. My engine bogs when full throttle is applied If this is your first visit, be sure to check out the FAQ by clicking the link above. Its beautiful outside today! So I'm working on a 1977 Puch Maxi 1hp. A couple of degrees can make a big difference in acceleration characteristics. Firemanmike, I too have a quadrajet that I believe is a culprit, motor starts fine, throttles up good but only getting 2200 rpms out of engine. I have a 96 z240 7. if i let it idle again right after that it comes back and idles. Had the boat out today after some work to the carbs. Like the title says I have a 1999 Tacoma 3. Problem: When the tach reaches around 6-7 rpm, the engine begins to bog but it doesnt cut out. A single barrel carburetor will normally squirt a single stream; while a two or four barrel carburetor will normally squirt 2 streams. The Full Throttle Saloon Off-Road Rally powered by Polaris RZR is your rally for all ATVs, UTVs, Jeeps and any badass off-road vehicle you’ve got. Problem CONDITION POSSIBLE CAUSE CORRECTION 3) Ford& Holley Only. It's been bogging out when I give it 1/2 or full throttle. Bad MAP (manifold absolute pressure) sensor Bad TPS (throttle position) sensor Bad or dirty MAF (mass airflow) sensor Low fuel pressure (leaky fuel pressure regulator or weak fuel pump). But it bogs badly when. Install a good throttle return spring. Hi i am new to jet skis. With the engine operating at full throttle, the blades will be spinning at full velocity, meaning that they will not get bogged down in heavy patches of grass. Why does A CHEVY 350 engine run flawless at idle but bog and sputter at wide open throttle? Answer. problem: last week it would bog with a. When starting cold, engine idles (set at 700 RPM) just fine, when engine is warmed up (5 -10 min), engage full throttle and all is good. A: For many years, it has been widely accepted that the major difference between the 400 Firebird and GTO engine (1967-1968) has been the carburetor. as soon as you hit a certain spot in the throttle. Maybe a tip to the Edelbrock on a "base" engine and a tip to the Holley on a "TNT/Magnum. If the saw drops at full throttle, not. When the engine is cold, more fuel is needed for transition from idle to part-throttle. So to stay in the factory air/fuel ratio at full throttle, you need to stay close to the. bogs at full throttle 99 R6 (carbs) This is a discussion on bogs at full throttle 99 R6 (carbs) within the R6 Maintenance & Technical forums, part of the Yamaha R6 category; i've had this problem ongoing since end of last season and have tried to fix it myself but i am. Q: Firebird Q-Jet 'Tab' for 1967 / 1968 Does anyone have information of the bent tab used to limit the horsepower for the carburetor found on the 400 Firebird. Hello, So I have a bit of a Frankenstein snowmobile. So far I have changed fuel, fuel filter, spark plugs (gapped them), plug wires, distributor cap and still have the same problem. Shop Now for Archery & Bow Hunting Gear from Archer Full Throttle. I've had my new bike running for two days and I've noticed if i twist the throttle all the way all at once it bogs down and wants to die. It accelerates smooth, but after a few blocks at top speed, it starts to sputter, bogs, and will die unless I let go of the throttle. This thing runs great, starts every time and idles nice. Re-jetting your Carter carburetor can pay big dividends at the race track and with increased fuel efficency. Runs perfectly fine at the first 3/4 of throttle and idles. 1973 Corvette, 350 small block, quadrajet, all vacuum hoses correctly connected. Outboard Marine Motor bogs down when giving it throttle it too would bog down when I gave it gas. 3 with stock cam, no cats, and CAI, on 91 octane runs between 23. Above half, it bogs and will pretty much die if you keep your foot down. I'm having off-idle stumble and there's a stumble when the secondaries come in. This book, How to Rebuild and Modify Rochester Quadrajet Carburetors, seeks to lift the veil of mystery surrounding the Q-Jet and show owners how to tune and modify their carbs for maximum performance. Hello, So I have a bit of a Frankenstein snowmobile. He said he flushed the fuel system, changed the fuel pump actuator, 02 Sensor actuator, spark plugs, replace a. Vacuum secondary carburetor bogging If the engine is sluggish in response at full throttle then the secondaries may not be opening soon enough. Upon throttle up, I then get backfire through the secondary on the carb. Almost stalls. Like the title says I have a 1999 Tacoma 3. Quadrajet 4 MC, 4 MV Carburetor Trouble Shooting E4MC, E4ME Adjustment Procedures I have a Rochester Quadrajet Marine Carburetor #17059286. Maybe a slight edge to Edelbrock for economy and stock-like behavior (starting, warm-up, etc. Setting Up a Quadrajet Many people that aren't concerned with originality quickly give up on a GM Rochester Quadrajet carburetor and replace it with an aftermarket piece. We are not affiliated with Mercury Marine and accept no advertising. I have a '14 1000 and at a ride last weekend it started cutting in and out at full throttle. July - Aug. Every factory Rochester Quadrajet flows a minimum 750 cfm, and there were a few units rated at 800 cfm. These are the only 2 ways I have found that actually allow me to drill a hole now. Accelerates smoothly and with no problem. From there on, main jet / metering rods and spring are very important. trucks have dual capacity accelerator pumps. In addition to this circuit, there is a tiny slot cut into the throttle opening on the primary side (and on all four barrels if the carburetor is equipped with four-corner idle mixture adjustment). The actual secondary throttle blade lock-out lever is down on the bottom. So my '85 200x has had this problem for a while nowWith the choke all the way down if you punch the throttle it almost diesWith the choke half way up or all the way up it won't do it but doesn't seem to have that much power. Make certain that it positively closes the throttle. 1 Tuning Your Carb for Best Performance - Rochester 4GC Rochester 4GC Carburetors - Information and General Operation When designed, the 4CG used as small a venturi as possible to keep air velocity high and as such allow efficient metering of the fuel. The Zako ATS Throttle Shaft Tool is a one-piece, foolproof solution to installing bushings with perfect alignment, every time! Product Specifications Each kit includes the precision four flute reamer with depth stop and pilot. Got annoyed with a lifter tick after numerous time setting the valve lash. It was when I was running the Stage 2 Power pack from Ford with the GT350 throttle body. The car works normally when you give it f. So if you are riding along at middle rpm in 3rd gear, and whack the throttle full open, what happens? Does the bike just instantly bog, gradually work through the bog and then accellerate to high rpm?. You say you replaced a diaphragm, so it sounds like you have CV type carbs? If you have CV carbs, can you see if the slides are actually going up when you open the throttle and it starts to bog? Is the bike rideable? If the rear cylinder is only heating at a low rate it sounds like that cylinder isn't burning, could be spark or fuel. Just bought a used 2006 Honda TRX450R. Once this happens, I can't run more than 5 mph or it dies. The problem gets worse as you go up the clip (lean) and better when you go down (rich). so every works great now, got it to idle correct, cold start no problem, but when im going down the street and give it full throttle, its bogs down,i have to slowly push the pedal in to get full throttle. Install a good throttle return spring. if it is held open then it continues to bog till it completely dies but if i roll the throttle back and then get back on it then it picks back up and runs fine. The car has a weird noise when the throttle is full open. from a dead stop, when I step on the gas, i hear air intake, and then the rpms go down and then up and then the truck responds a second or so late. i asked if a screamin eagle intake would help and they said no. 32/36 Weber Bogs Down At Full Throttle I took it for a test drive the other day and everything is great except when applying full throttle. The Zako ATS Throttle Shaft Tool is a one-piece, foolproof solution to installing bushings with perfect alignment, every time! Product Specifications Each kit includes the precision four flute reamer with depth stop and pilot. Hi all I'm new here I need some help I have a 253 in my one tonner and I just put a new quadrajet on it that i brought from bursons and it started up after I put it on and mucked arround with the choke I got it to run but it run real rich it went ok I drove up the street to get fuel and then went around the block and it started running rough and now it won't start if any one is around the. Runs and idles good and revs up fine with no load on it. I can set the idle high, to minimize the stall, but this is a problem trying to land with it pulling to much. Ended up being the damn water pump, just something you might wanna check out. You will then need. Finally figured. If your carburetor has vacuum secondaries and a noticeable bog on full-throttle acceleration, the secondary spring may be too weak. Like PawPaw mentioned, it could be a fuel starvation issue, but also check for bad gas or a clogged main jet. problem: last week it would bog with a. Stage-1 Typical Application: Stock engine; For those looking to utilize a performance-upgraded Quadrajet, the Stage 2 rebuild might be just what you need. We also found our full-throttle A/F ratio to be near 11. com has led you here!. Re: Quadrajet / 350 Chevrolet Also, nothing like a Q-jet for reasonable fuel mileage with those tiny primaries. 75 turns out idle mix adjuster, 3rd clip down (middle) needle. I have checked for vacuum leaks and found none. 00 for this. Its the chainsaw on my tag. The Zako ATS Throttle Shaft Tool is a one-piece, foolproof solution to installing bushings with perfect alignment, every time! Product Specifications Each kit includes the precision four flute reamer with depth stop and pilot. The problem I'm having is that when I stab the throttle from a start or very low RPM range it bogs for a second and then takes off. dies if i hold. Wide open throttle bog I have learned so much from this forum. in a full tank of gas. You mentioned "bog" at full throttle - The air screw won't be doing anything at full throttle. Observe the pump jet in the carburetor, and with your hand, work the carburetor throttle to the wide-open position. I agree that your setup can handle several more degrees of timing. The Q-Jet is a very capable but often misunderstood carb. Car starts on a dime and drives great for about 10 mins just all of a sudden just bogs down and idles really low then finally stalls. It idles good but when i lay into it it sutters and bogs down. trucks have dual capacity accelerator pumps. On engines equipped with Quadrajet carburetors, make certain. Cliff's High Performance Quadrajets - Quadrajet rebuild kits, tuning & Carburetor restoration services for Rochester Quadrajet repair, kits and parts. In addition, the idle cicuit continues to deliver fuel even when the carb is delivering fuel through the main metering circuit. From 1976 or so until 1978, the Jeep 360 and 401 4bbl engines used a unique spreadbore carburetor known as the Motorcraft 4350. 0 second 1/4 mile with the Carter BBS 1bbl carb, automatic transmission, and 2. Quadrajet Tech. Learn about this problem, why it occurs, and how to fix it. The engine does not want to rev over 2500 grand or so. When an engine won't rev up with throttle increase, it means the carbs are starving for fuel/air mixture which comes from the pilot circuit. It looks like this:. It runs great upto 3/4 throttle but once i bar it the bike bogs right out. Using the LM-1 as a Tuning Aid. The body is a 340, engine is a 400 free air (I can't find any. The problem I am experiencing is when I floor it or nearly floor it, it has good power for a couple of seconds, then bogs down. Finally figured. Husqvarna 235 bogs out at full throttle? Was running fine I replaced the primer bulb and now it won't idle unless the choke is open and bogs down and wants to die at full throttle Bob Prunty August 2013. I've been driving it, and if you accelerate slowly or just average, like getting into traffic, it's fine. High capacity accelerator pump featuring materials that are resistant to alcohol and other additive commonly found in today's fuel. Contrary to what you may think, street engines spend a majority of time at idel and at very low throttle openings. com/3fbtm/ltwab. Bogging at full throttle after headers. Broke down and bought a new set of lifters and pushrods. Stage-1 Typical Application: Stock engine; For those looking to utilize a performance-upgraded Quadrajet, the Stage 2 rebuild might be just what you need. 5 mains and 17. it hits the power band at weird times, and has to build up to its top speed and if you hit full throttle loses power. I have taken the TBI unit apart and soaked it in cleaner solution, did the kit with the diaphragm, same thing. 1985/86 Q-jets in U. (The fun part!) Decrease the wrap (loosen) until a loss of performance is noted by bog. 4) No power or heat source to choke. 5 and timing is 36 @ 3000. If it bogs on 1/8 to 1/4 of a turn then it was about right and you should leave it. Check for interference at the accelerator pump linkage. my bike has gone through a lot of ups and downs it recently decided to stop running and i got a lot of help from people on this forum. This pressure controlled throttle provides relatively even intake pressure throughout the engine's speed and load ranges. FLOAT BOWL UNDERSIDE Fuel Well Plugs. so say I'll be idling through a channel through a no wake zone and then I get back to open water. I have to back off for it to 'catch up', if that makes any sense. That spring to hold down the secondaries was a great idea! With the secondaries held shut, it is less of a bog now and more of a hesitation. A Problem That Most Q-jets Are Known For Is Hard Starting A problem that most Q-jets are known for is hard starting when cold. Just bought a used 2006 Honda TRX450R. Less Likely to Bog Down in Heavy Grass. Full Forum Listing. have to see how many turns out they are set with vacuum gauge. Since its introduction in 1965, the Rochester Quadrajet has never received the respect it deserves. Other online resources and digital media. Ford Ranger 1991 ford ranger bogging down when accelerating to much - 186 reports. Its beautiful outside today! So I'm working on a 1977 Puch Maxi 1hp. If the saw drops at full throttle, not. It actually goes slower than below half throttle. Idles and runs great with no load but as soon as we put her in the water she bogs down and loads up at just past 3/4 throttle. Fresh 89 octane+2cycle(50:1) has been added as well. The last test is the one that I want a second (or third or fourth) opinion on. Also if that doesn’t work, I have found that if I move the choke lever to in between half and full choke it will drill through the ice but with less power. Bogs from 0 to 1/8th throttle, right off of idle, really. The Latest. You may have to register before you can post: click the register link above to proceed. I added a new carb from 17mm to a 20mm for more power. It is also strange because if I mess with the choke enough, I can get it to blow pretty hard with half throttle (and it won't die down), but it is very hit-and-miss and still doesn't blow. *Snow blower started right but was leaking gas out of the carb. Hi guys, hope you can help me, once i start my On road nitro car the engine gets up to temperature about 215f and idles perfectly, when i give it full throttle it bogs down and will sometimes cut out, am i running too rich or too lean on the HSN. Start at 4:51 if your in a hurry for a solution. It bogs down past 3/4 throttle. Orangewrx · Registered. I did have one guy PM on another forum saying he had the same issue, Horizon sent a new carb and that didn't fix it. I have fitted a SIP Road 2. I am here !!!!! A bog from idle is a lean condition not a rich condition ! if you crack the throttle hard from idle on a smoker and it goes baooooor and dies it is lean, the motor sucks a huge gob full of air and dies, if you replaced the carb with say a 30mm item it would never happen. Few people realize that the Q-Jet has a strong racing heritage, particularly in N. Why Does My Stihl Chain Saw Bog Down When I'm Cutting? 3 My Stihl Weed Trimmer Is Dying at Full Throttle; After engaging the throttle, place a digital tachometer next to the spark plug and. Hey Everyone, Thanks for having me on the forum. The Q-jet has large secondaries so it really sucks the gas. a 2mm drill bit fits easy thru the idle holes the mixture screws seat still thou so they have been drilled out. After setting the lash and reassembling took it for a drive and when full throttle it bogs down. The Dashpot pulls the throttle linkage shut so disconnecting it would cause the problem all the time. It has a "bog" going from idle to full throttle. Just prior to [the onset of this problem], some gasoline fuel was added to the engine's fuel tank from a jerry can. Almost same indications. The advantage of the Q-jet is its small primary throttle venturis with very quick-responding boosters that offer excellent throttle response, making it an excellent street carburetor. If I happen to release the throttle the speed will drop and if given more throttle it will stay at that lower speed and not go faster till I pull over. Clean your carb and spray carb cleaner in all small passages, make sure air can flow through all ports no matter how small. Hook up the throttle linkage and adjust for full throttle with someone pressing the gas pedal. It is now running best and holding best idle at 1/2 turn to 1/4 turn out on the Air screws. The code of manufacture is also at this location. Comparing the Motorcraft 4350 Spreadbore Carburetor. 79 K20 rattling noise at full throttle, idling too high C lag that all quadrajet carbs have at initial throttling). It starts around 6500 RPM and keeps gaining RPM into high 7000's but is cutting in and out the whole way. I agree that your setup can handle several more degrees of timing. I did manage to start it periodically and let it get up to operating temps, same with the genset and roof A/C's. Make certain that it positively closes the throttle. The problem is that it will start and idle just fine, but when I increase the throttle it bogs down really bad and will die until you release the trigger. Even with a big vac leak it never set a lean code, just thrashed around trying to compensate. Seems a pity. The motor has about 5000 miles on it and seems pretty solid. Like the title says I have a 1999 Tacoma 3. After I let the engine warm up and move the choke lever to the open position and give it the gas, it just bogs down. 350 with HEI and quadrajet, Stumble when full throttle It is hard to get that off idle bog out of a old quadrajet. I'll be very surprised if you loosen beyond 3/4 of a turn of where it is now. It took some work to get the car running because the idle mixture screws were turned in and the car would stall as soon as choke started to open. I have a very well maintained '05 Eclipse with the 2. Problems Carburetor doesn't adjust properly Carburetor floods Fuel leaks at shaft Internal fuel leak Misses or surges Stumbles or loads up Engine won't idle Rough idle Backfires Bogs Hard starting Lack of power Pinging at moderate cruise just off idle Engine stalls on hard braking Low fuel economy Possible Solutions. no vacuum lines on it at all and. If it idles fine but it bogs down with throttle, your high speed gas jet is probably clogged. Narrowing down the cause of engine bog and dead spots in the rpm range - Hot Rod Magazine. I just got a 70cc motor, and so far i've put around 20 miles on it, but it seems to bog down when i give it full throttle. Also if that doesn’t work, I have found that if I move the choke lever to in between half and full choke it will drill through the ice but with less power. If it idles fine but it bogs down with throttle, your high speed gas jet is probably clogged. It's been bogging out when I give it 1/2 or full throttle. The Zako ATS Throttle Shaft Tool is a one-piece, foolproof solution to installing bushings with perfect alignment, every time! Product Specifications Each kit includes the precision four flute reamer with depth stop and pilot. After cleaning the air filter and putting it back in, the scooter now bogs down when applying full throttle. Stage-1 Typical Application: Stock engine; For those looking to utilize a performance-upgraded Quadrajet, the Stage 2 rebuild might be just what you need. I'll be very surprised if you loosen beyond 3/4 of a turn of where it is now. 71 chevy with 350 engine, edelbrock intake and 600 cfm carb setup, new HEI distributor put installed, 8mm spark plug wires. There's issues with throttle linkage, purchased custom studs and was able to re-mount the stock Merc linkage bracket This is not a plug and play swap, if, or when you decide to scrap the Quadrajet. they assured me it was quite normal and that all heritages do that at high throttle and i tend to beleive them. My son just picked up a fairly clean 1999 RM250. The motor has about 5000 miles on it and seems pretty solid. 4) No power or heat source to choke. The trouble starts when I smash the throttle to WOT engine starts to rev then cuts out, acts like it is going to stall but doesn't. 1/4 to 3/4 throttle, needlejet (atomiser) needle position and taper of needle. As for choke adjustment when the choke is closed and cold you want the choke butterfly closed down so there is a little gap not slammed shut. Q: Firebird Q-Jet 'Tab' for 1967 / 1968 Does anyone have information of the bent tab used to limit the horsepower for the carburetor found on the 400 Firebird. Less Likely to Bog Down in Heavy Grass. 3/4-full throttle: sputtering and VERY low power SOHC/4 Owners Club Forums But also, it has zero power above maybe 3500 rpmit just won't do much under load.