Question about Chevrolet Impala

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2002 CHEVY IMPALA, 3.4L ENGINE, NO POWER ON ACCELERATION. IDLES FINE. Car idles fine but has no power on acceleration. Especially when going up a hill. Check engine light did come on and code alerted to EGR Valve replacement. I replaced EGR valve and there was no change in performance. I then did a standard tune up (plugs, wires, air filter, pcv, etc) with no change in performance. Last, i changed main inline fuel filter under car by gas tank. No change in performance. As of today, i started hearing a "whining" sound coming from front left of car, perhaps from under the hood, whenever i hit the gas. It i hit the gas pedal, i hear a whining sound. As soon as i release gas pedal, whining sound goes away. Other than all the parts i have already changed, possible solutions i have found include: a.) torque converter is bad b,) transmission needs to be serviced c.) fuel pump d.) catalytic converter clogged. i do not have a gauge to test fuel line pressure and rule out fuel pump. i did drive car 7 miles @ night and immediately checked to see if pipe in front of catalytic converter was cherry-red hot implying the converter is clogged. The pipe was not glowing hot. front exhaust pipe was same color as the others. With all of this information, can anyone help me diagnose what is causing this problem? Am i wasting my time if tomorrow morning i try to replace the transmission filter, clean the trans pan and screen and add all new trans fluid + a quart of Trans-X transmission no-slip additive? Any advice will be appreciated. I am not a mechanic, i sell toner cartridges, but i am doing the very best i can with no success. Thank you all in advance for any help you can provide. -Scott

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  • info15108 Apr 25, 2010

    This is by far the best answer i have ever received on this website. Thank you very much. I will start tackling your suggestions in the morning and get back to you. You are a good man and a scholar. Thanks again. -Scott

  • info15108 Apr 25, 2010

    Thank you again. I banged the MAS sensor while running. No change in idle. I also banged the CAT while running. No change in idle. I will take it to AAMCO for a free trans diagnostic check now.

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Scott,

Here are some additional suggestions:

1. open hood - locate MAS (mass airflow sensor) - with engine idling, tap on it with a screwdriver handle or a wrench. If the car hesitates, stalls or dies, replace it.

2. Whinning - check tranny fluid first - if full, good but it may need changed (if not already) I recommend adding a court of Lucas Oil to it in replacement of regular fluid (do this for your oil as well). Also, if the whinning is comming from your tranny, don't drive the car anymore. Pull the tranny and replace the torque converter and seal. If it still does this replace the drive axles and seals on the tranny that they slide into.

3. If you suspect the CAT is plugged (if so, won't necessary glow when overheated, as the plug may not be that bad yet), start the car and lightly tap on the cat with your foot or with a long object such as a broom handle. If the car stalls, or the idle changes, it may be a good idea to change it as well as the O2 sensors (oxygen sensors) if you haven't already. On this car there may be two - first one should be located just behind the engine on the exhaust manifold. (If standard V6 placement: piston fron and back, not side to side). The second will be located just before the CAT.

Also, as a precaution and safe measure - and before all or any of the above - (especially for tranny) ensure that all vacuum lines are connected and in good repair. One loose or leaky line will make all the difference, especially in drivetrain power.

Please let me know if you need any further assistance.

Thank you,

carsandcomps,

Guru, Premium Expert @Fixya.com

Posted on Apr 25, 2010

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Your solutions are correct: a.) torque converter is bad b,) transmission needs to be serviced c.) fuel pump d.) catalytic converter clogged

You can rule out the CAT converter since it was not red hot after driving it seven miles. I would first check the wheel bearings and see if that is causing the whining sound. If your wheel bearings are good then the next thing to do is check the power steering fluid level. If your power steering fluid is low it would make a whining sound. If that is ok then the last thing to change is the automatic transmission filter kit and ATF fluid. Look for metal filings in the pan after you remove it. If you have alot of metal filings then your transmission will need to be rebuilt. I owned a Buick Park Ave that would not go into reverse and I used the Trans X additive and it gave me another 1000 miles before the transmission finally gave out.

http://autoforums.carjunky.com/Automotive_Repair_C1/Car_Making_Funny_Noises_F7/Whining_noise-2002_Chevy/Impala_P35968/

http://www.carcomplaints.com/Chevrolet/Impala/2002/transmission/whining_noise_from_transmission.shtml

Posted on Apr 25, 2010

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2 Answers

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