Question about 2008 Chevrolet Aveo

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Car bucks alittle when it reaches normal temp

When i am driving my car and i sit at the light it starts to buck a little. why is that?

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The vehicle may be over fueling or not getting enough fuel at idle . Could be caused by a sensor in the engine reading improperly, spark plugs with excessive gap or a vacum leak. Chances are this vehicle has a check engine light on that would give you a better indication of what sysem is being affected causing the problem.

Posted on Jan 14, 2013

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Fuel filter plugged or fuel pump going bad,try some injector cleaner,also in the winter months put heat or isopropyl in gas tank at each fill up,also check your air filter

Posted on Jan 14, 2013

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Posted on Jan 02, 2017

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SOURCE: 1994 LT1 Engine "balks" under acceleration intermittently

Your fuel pump or your catalytic is plugged. have it tested with a infrared gun it will tell you if the cat is bad and if it is replace it test the fuel pump for fuel rail pressure it should read 50 psi then hold to 20 psi for 1 minute.. Also check to see if the intake plate is dirty and if it is do a top engine clean, buy GM's top engine cleaner and run it threw the engine, if you have carbon buildup the compression and cause the car to run bad and the knock sensor will not be able to adjust time. I know this sounds silly but these three things will cause your problem and so will a bad fuel filter.

Posted on Jul 22, 2009

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SOURCE: 1994 corvette starts good if sits for 2 days but

Coolant temperature sensor is bad. Telling computer that the engine is still cold and over fueling as if it were a cold engine.

Posted on Aug 26, 2009

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SOURCE: car is bucking, engine light on code po742

"Torque converter clutch" solenoid is stuck open which is causing your bucking problems. The solenoid is either disconnected or faulty. if you ran over something, it may have damaged the wiring, but if not, you need to take it in for checkup.

Posted on Nov 06, 2009

  • 6826 Answers

SOURCE: bucks and stalls

Need to have it put on a code reader,auto zone can do this for you,for free.

Posted on Jan 23, 2010

  • 21 Answers

SOURCE: 2000 Impala ls car runs fine when first start.

There are NO choke coils on your vehicle, so don't bother looking for something that doesn't exist, just like there is NO carb on your engine. What you have is either a 3.4 or 3.8 liter V-6, sequential multi-port fuel injected engine.

The first thing you should do is replace the fuel filter. This is located underneath your vehicle, in front of the rear suspension. You will need a 10mm socket or wrench to remove the bolt that holds on the mounting bracket for the fuel filter. You will then need to push the fuel line forward towards the filter, while you are pushing in the white plastic retaining clips, then while holding them him, continue to hold the filter with one hand, while pulling back the line with the other, It should easily come off. Repeat for the other line. I recommend this as the first step, because many vehicle owners don't bother to get their fuel filter changed as often as they should. It should be changed at least every 24,000 miles.

Drive the vehicle and see if that took care of the problem. If not, you most likely have a bad fuel pump, which is mounted in the fuel tank, a bad fuel pressure regulator, which is mounted on the fuel rail on the engine, it is usually black with a vacuum line going to the top of it, and you may also have a catalytic converter that is starting to go bad, as once they heat up is usually when the internal grid expands and can begin blocking the exhaust.

This may all seem overwhelming to you, but an easier solution might be for you to take it so a reputable shop and have them run diagnostics on it, with you then bringing home and doing the repair yourself to save on parts and labor. Diagnostic fees could run slightly less than $100, to slightly more than that, but could save you from buying and replacing parts that you don't need.

Hope this helps.

Posted on Apr 07, 2010

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