Chevrolet - Suburban :: 1994 - Slight Buck When Step On Gas
May 12, 2012
"step on gas, truck feel like it is pulling a house, slight buck, but with more gas it moves, it has good presure out the exhast, all wheels are turning freely, engine idles great has lots of power,"
tested, cyl pressure, fine
check engine timing, fine
made sure all wheels spin freely, fine
check all fluids, fine
slight pinging sound can be heard, from time to time from center of truck. I'm thinking torque convertor. Feels like engine is binding only when you put it in gear.
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I have just swapped a new Vortec V-8 engine into my 1999 Chevrolet Suburban K1500 4*4, now when I start the truck and put it into reverse (foot still on brake pedal), I let off of the brake and the next time I step on the brake pedal the truck stalls. What would be causing this? I have no error codes on the computer, my fuel pressure is good, I just replaced the fuel pump. I think that it might be a sensor somewhere, but I am not sure where to look.
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I have a 94 C2500 suburban with a TBI 454BB. Obviously, I'm not concerned with fuel mileage, but I am currently getting about 4 miles to the gallon because the idle is stuck at 1800RPM. Normal idle for my model according to the index book is 750RPM. it's usually pretty close to that when operating normally (+/-25RPM). 3 days ago I did my biannual throttle body cleaning. Took it completely off replaced the gasket cleaned the throttle body and put it all back together. This is when the problem started... It now idles at 2300 RPM, it threw the code for bad idle air control valve, and I figured I probably got the plug wet when cleaning the throttle body, so I went ahead and ate the 60 bucks and replaced it.
Went through the reset process for the ECM to learn the new one and it the idle has come down to 1800RPM, it also literally DUMPING fuel through the injectors into the top of the throttle body. While I don't believe it is actually running rich, it seems more like the idle is trying to compensate for the excess fuel that is being dumped into the top end. Now, Before I go any further I want someone else's input. "I" think it is a also a bad throttle position sensor that probably got wet when cleaning the TB. But I am worried it could also be the PCM has finally gone out, although this is probably not likely because the entire ignition is run by this and if it was bad, it would stand to reason that it wouldn't run at all. Or it could be a bad vacuums control module. I have checked all my vacuum lines and do not have any leaks, so I know that isn't the problem. So that's where I am. I am hoping to check the leads on the TPS today with a ohm meter. I know my resistance levels.
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My 1994 Chevy Suburban will not engage the front drive shaft. It has an electric actuator and it will not engage. the transfer case engages but not the front axal. When I shift the transfer case into 4Hi or 4Low it will shift itself but the light will not turn on. I have heared rumors that you might have to manualy connect it to the battery and have a kill switch in the cab. What is the problem and should I connect it manualy?
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I have a 94 Chevy Suburban C1500 with a 5.7L, 350 Engine. It has 235,000 miles on it. I purchased it about 4 years ago with 191,000 miles in very good condition and obviously well maintained. I have continued to maintain it well.
For the past few months it has begun to start a little slower that before and when accelerating cold or warm there is a spot where it looses power. It doesn't sputter or die it just looses power. I can press the accelerator farther and it will come back to life and do fine. After a 20 -30 minute drive if I park for a while, 20 - 30 minutes, when I start it up it dies. The only way to keep it running is to give it the gas and smooth it out at about 1500 rpm for 10 - 15 seconds. Then I can drive it with no problem most of the time though it still has the dead spot on acceleration.
There is a good spray pattern from the throttle body injectors. Plugs and wires are relatively new and plugs look good (AC Delco Rapidfire Platinum). When I turn on the ignition without going to start, the fuel pump builds pressure for 4 - 6 seconds. I haven't checked the fuel pressure yet and am considering investing in the rig to do so. I recently replaced the fuel filter but that didn't work.
The check engine light has not come on but many of the lights in the cluster are burned out and I haven't felt like going to the trouble to fix that so it is possible that the check engine bulb is bad.
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I have the 5.3L FLEX Fuel with 98K miles. I have purchased this 2nd hand and having a slight idle stumble when in park as well as in drive @ a stop light...etc. If i am under way, the vehicle runs flawlessly. When i am idling with the brake on or in park, there is a slight stumble that is driving me crazy. I have replaced the high dollar IRIDIUM plugs but did not replace the wires...they looked fine. I did clean the throttle body. I get fuel from different places and it does not make a difference. I have not cleaned the fuel system professionally but I have used OTC additives such as SeaFoam. No codes are exhibited on a diagnostic computer or any updates available for that matter.
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I have a 1975 Chevy Caprice Convertible with a 454 cubic inch "big block" engine with a 4 barrel carb. The car is in mint, original condition with 24,000 miles. Usually the car runs flawlessly, however, lately I have noticed that the car doesn't like going uphill. On level ground and downhill, everything is fine. However, when the engine and car are hot, and I come upon a hill, the car will start to buck and sputter as if the gas is being chocked off. A few extreme times, the car has stalled out completely. Once I role back down the hill onto level ground, the car starts up and everything is back to normal. The problem is not noticeable when the car is cold.
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I have a 1994 4x2 shortbed standard cab Ranger XLT. It has the 4.0 OHV engine, A4LD Automatic transmission, and 195,000 miles.
Under average driving conditions, it operates fine. It shifts up through the gears much like it always has, although the shifts may not be quite as firm as they used to be.
If I'm at cruising speed and step harder on the accelerator, it downshifts, RPMs increase, and it upshifts rather poorly, & then I feel a thump, (maybe the torque converter locking up when it shouldn't be?), and I'm in the higher gear. This seems to happen when it upshifts from 3rd to 4th gears for sure, maybe from 2nd to 3rd, but I'm not sure. Again, it only seems to happen when I attempt to speed up from cruising speed, not from a stand-still.
The transmission fluid and filter have been changed at regular intervals, and the truck has never been abused. The fluid is red in color, doesn't smell burnt, and the level is correct. I don't want to get rid of this truck if I can avoid it. It has been super-reliable and mostly trouble-free for the 16 years I've owned it.
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I have a 1994 4x2 shortbed standard cab Ranger XLT. It has the 4.0 OHV engine, A4LD Automatic transmission, and 195,000 miles. Under average driving conditions, it operates fine. It shifts up through the gears much like it always has, although the shifts may not be quite as firm as they used to be.
If I'm at cruising speed and step harder on the accelerator, it downshifts, RPMs increase, and it upshifts rather poorly, & then I feel a thump, (maybe the torque converter locking up when it shouldn't be?), and I'm in the higher gear. This seems to happen when it upshifts from 3rd to 4th gears for sure, maybe from 2nd to 3rd, but I'm not sure.
Again, it only seems to happen when I attempt to speed up from cruising speed, not from a stand-still. The transmission fluid and filter have been changed at regular intervals, and the truck has never been abused. The fluid is red in color, doesn't smell burnt, and the level is correct. I don't want to get rid of this truck if I can avoid it. It has been super-reliable and mostly trouble-free for the 16 years I've owned it. What might be wrong with it?
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My fuel pump is about 5psi low. Is that enough to justify replacing it. The car likes to buck when accelerating. Had the cat converter tested. It was in good shape. Replace plugs and wires a while back. Regular maintenance. 2002 Monte Carlo SS 100k miles.
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I have a 2003 impala I just bought and it has an intermittent problem. Sometimes when I step on the gas the motor will 'slam'---kinda like if the motor mounts were bad but they look good and it doesn't always do this. Also, if I hit the gas pedal hard and then almost as quickly let off the gas pedal I get the same effect--shutter/slam. I suspect the mounts but they look fine. If I keep on the gas all gears shift very smoothly. Gear shift is smooth thru all gears if I floor it or go slowly accelerate so it seems not to be the transmission either.
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I have a ac compressor that doesn't work all the time. I have read how voltage or low power can effect this. When mine does not start up, if you tap the end of the compressor with a rubber mallet, it engages and runs fine for an extended period. Am I dealing with a power supply issue, or could this just be a bad ac clutch?
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In V8 mode the engine runs smooth but as soon as it switches to V4 I get a noticeable vibe, the same kind of vibe when an engine is missing, and that slightly different sound that sounds like a miss. It never stays in V4 at steady speeds, instead quickly switches back to V8 because V4 can't hold speed. All this and the fact my mileage sucks makes me think I'm down a cylinder. Everyone else says their switching goes unnoticed whereas I can hear and feel mine. Is there a simple way I can check if I have cylinders missing or even pinpoint which ones? Does the V4 operation always use the same cylinders? I've hooked up OBD and that says nothing.
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I have a 1994 suburban1500 heater is not working in front or rear and in the front I have no control on the vents it only blows on the floor flashes if I try and change from floor to vents or defrost also blows air on floor while driving with the fan off so seems that the vent is stuck open the rear I have control on vent or floor just will not blow heat just outside temp air I had the same problem with a buick I had and never figured out the problem this is driving me crazy.
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Started having problems with my Chevy Malibu (1999, with 95,000 miles on it) while driving two times this week. Both times an alert warning flashed on my dashboard. The first time, flashed the brake check and ABS warning on the left side of the dashboard, and the second time the check oil and check battery warning on the right side. In both cases, after the warnings flashed, the car was still running, but stepping on the gas pedal resulted in no acceleration, but brakes still worked. The steering wheel also locks-up to the point where I can't turn any more. Both times, I stopped and shut off the engine, waited about 30 seconds and restarted, after which everything is fine and normal. The brake pads were changed recently, but not the rotors which may not be in very good shape.
I took the car to garage and found the belt is good, but I have replaced both the alternator and battery, and also changed the brake pads. Car ran fine for a day. Yesterday while driving, had another issue of the accelerator not working while in the middle of driving. Was going up a small hill, tried to accelerate, but stepping on the accelerator didn't do anything. A few seconds later, I could not press down on the pedal anymore (as if the car was off). Brakes worked, I could turn, and no warning lights. Turned off ignition, restarted the car, and everything was fine. Same problem with the accelerator as I first reported, but no problem with charging or turning the wheel, and no warning lights since the alternator and battery are new.
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My 2007 4 cyl. Malibu does a shimmy and shake when I step on the brakes. It seems to be worse when traveling at a faster rate of speed then when driving around town.
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First bit of cold weather and I'm getting thirty seconds of loud clicking (or clacking) coming from the immediate vicinity of the blower motor on start up and shut down. Doesn't matter whether my climate control is on or off, it still makes the noise. I'm assuming it's stripped out teeth on one of the blend door actuator gears and I'll probably just end up replacing it. My problem: Where exactly is the offending actuator? I've removed the glove box and noted one located on the left side. I unplugged this but am still getting the ratcheting sound so it obviously isn't the culprit. I had this happen a few years back (same time of year) and out of ignorance and frustration solved it with a well aimed kick but the way it's acting this time I don't think I've got a big enough boot.
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1999 Suburban 5.7L Vortec
Symptoms: While driving after engine warm-up the engine misfires on cylinder 2 under slight load (basically whenever maintaining speed, and slight acceleration) between 1500-3000 rpm's. Backfires through exhaust when this is happening. Misfire counts on Cyl. 2 collect rapidly and only a few on Cyl. 1 but no P0301.
History: Purchased vehicle with a blown engine (intake gasket leaked coolant into engine and was hydro-locked) with the intention of using it to pull a boat or camper but never did buy either one. Replaced the engine with a new Goodwrench engine and rebuilt the tranny figuring I would drive it till the body rusted off of it. I honestly never felt that the truck ran as strong as it should have with a brand new engine but just attributed it to being as big as a cruise ship. A couple of years later started receiving multiple codes (don't remember what they were at this time) found the distributor very corroded inside due to the ear on the distributor being broken off.
Replaced the distributor, cap,rotor,plugs and wires and fixed it. About a year later, only in the summer I would start to receive the P0302 sometimes, would not happen in the winter. Did the usual plug swap, wire swap, checked spark to rule out ignition with no change. After a while the catalytic converter failed (big surprise with a missing engine) and replaced it as well as both O2 sensors on the rear bank and one on the front bank. P0302 did not change. Last year the fuel pump failed so I replaced it. This April I took the truck on a road trip to visit relatives, about 80 miles out it started backfiring through the exhaust whenever I got over 70 mph and the CEL would flash. Finished the trip babying it the whole way but now it does this all the time when warm.
Repair attempts:
* Distributor, cap, rotor, wires, plugs. (Due to distributor failure mentioned above.)
* Fuel pump and filter. (Due to pump failure mentioned above.)
* Upgraded fuel injection spider. (Because of GM bulletin regarding misfires and multiple failures found on the internet.)
* Repeated valve and fuel system cleanings. (Grasping at straws.)
* Removed rear bank cylinder head and sent to machine shop, All checked good. (After ruling out ignition and fuel figured it had to mechanical. Compression was good, cylinder leak down test was good. The problem seems to be temperature related so thought maybe the exhaust guide was mis-manufactured too tight causing it to drag when warmed up.)
* Crank sensor with a used one from a u-pull it place, I got too much money wrapped up in this. (Found a reference to this repairing a similar problem on another vehicle.)
One final note: After replacing the fuel injection spider the truck ran extremely well, this only lasted a few days and the problem came back. After replacing the crank sensor the truck again ran extremely well, but only for 1-2 days. What is the connection between the injection spider and the cranks sensor? The only other thing that I can think of that would create a misfire on one cylinder only is the PCM but that gets misdiagnosed so much that I don't want to jump to it unless all other options have been checked out.
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I've got a 1982 automatic chevy 454 engine with only 46,000 miles on it (in my Winnebago RV). It runs just fine except each time I step on the gas pedal from a stopped position for an instant it sounds like the engine is about to die and then it starts going. Is this a major engine problem or something that requires minor adjustments? I want to sell the RV. If it's going to cost a lot to fix, I'd rather lower the price of the rig.
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If sensor or control module malfunction. Brakes are fine. If ABS relay, so where is it located, cant find in fuse box. This is a 1500 2WD suburban.
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My 2003 Suburban shakes when I drive over 70 mph. I don't know if the tires need realignment?
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