Question about 2003 Chevrolet Impala

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2003 Chevy Impala 3.8 engine . . . power loss

Hi, I have a 2003 Impala with the 3.8 engine. I recently noticed that it seems to be losing power over the last few weeks. When you start off from a stop, it just doesn't have the "get up and go" it used to. Heaven forbid you try going up a hill from a stop, then it really dogs it. When you push on the gas pedal it's just like "blah". It eventually gets up to speed but we're trying to figure out what the problem could be. We thought it may of been bad gas but I've been through 2 new tankfuls and no improvement really. Also put some Lucas "tune up in a bottle" in both new tanks of gas as well. The car has 132xxx miles on it. My husband tried to change out the plugs and wires but could only get 3 of the 6 done because the back 3 are apparently a bugger to get off and he cut his hand all up trying to get them off. We will get them changed out, but I don't really think that is the problem. Any other suggestions? I saw something about an EGR valve and clogged converter on previous posts. Are those hard to fix?

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  • Katott50 Nov 06, 2008

    Have the same problem with my Impala. No pick up speed at all, quite scary driving in heavy traffic. Replaced fuel filter, changed oil, replaced plugs and had fuel injectors cleaned. What and where is the ERG valve?

  • beastoakland Nov 27, 2008

    My 2003 window wont roll up or it takes up to 2 hrs to do so.

  • Anonymous May 11, 2009

    HI! I have a 2003 Impala. Went into passing gear and heard a pop./flutter and then no power. Cannot go any faster than 30 to 40 mph. Down hill is fine. I have 98,000 miles on the car. They changed the EGR valve and transmission oil and kit. Took to another dealer waiting for reply. He said Friday, 5/9/09 that it is not the transmission. I need help as I need the car for work. Any results would be appreciated greatly! Thank you!

  • uptowns_fyne
    uptowns_fyne Feb 28, 2012

    I have a 2003 Impala LS and the EGR Valve sits right up top to the right of the manifold cover. im having the same problem it doesnt have the get up that it should when it comes to a 3800 V6 and that p4 code pops up mine is still not fixed but so far i know that the EGR Valve And The Catalytic Converter works together to help the engine bread and give u the RPMS you need and i know my catalytic converter is bad so im going to get both those replaced and hopefully that fixes the issues i have.....Hope this comment was helpful to you all and hope we all can get our impalas up to par......

  • uptowns_fyne
    uptowns_fyne Feb 28, 2012

    the egr valve sits to the right of the manifold cover right up top if you go to an autozone they should be able to point it out to ya

  • uptowns_fyne
    uptowns_fyne Feb 28, 2012

    im having the same problem wit the get up of the car its weak for a 3800 V6 i know my catalytic converter is bad and the p4 code pops up and thats for the egr valve so im gonna get both done and hopefully i can get the RPMS i need to make my impala move...i can not go above 90mph

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Hey,

I had that prob about 2 years ago. at about 100,000 km.
The only other thing that was different later on after I lost some power was there was a squeeling like the fan belt to when I took it in for an oil change I asked them to replace the fan belt.

They did but then told me what the real problem was which was not good news.

It was the intake manifold gaskets which if left long enough then it would result in a total engine replacement. Luckly I bitched enough at a GM Dealer and called GM directly and after the run around they replace the gaskets at their cost. If I would have covered the charges it would have cost me well over $2,000.00.

Good luck with your fix and I hope it is not what I had go wrong but the 2002-2003 have this problem often, actually there is a class action lawsuit going on about it regarding the coolant reacting with the intake manifold gaskets and making them corrode.

Now I have a dirver window that will not go up which means it is the switch or the motor... which apparently is another common problem.

Posted on Sep 25, 2008

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I have a 2001 Impala that had the driverside window drop while we were a way on vacation. Fortunately it haden't rained and no one stole anything out of the car while we were away. A plastic bushing that secures the window regulator cable, had failed. I went to a salvage yard and pulled a regulator assembly out of a wreck for $25. I am also experienceing the lack of power/no power @ 138,000 miles, I replaced the fuel filter, and crank sensor, neither helped, the catalytic converter is next.

Posted on Jul 30, 2010

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I have a 2003 w/ 3.4l no power at all. I did a lower intake gasket (due to leaking coolant) after that really noticed how doggy it was after several other attempts took it to muffler shop, they put small hole in pipe to convertor to check back pressure it should be 1.25 psi max at 2500 RPMS mine was like 16 psi changed convertor and car runs like a champ. check with dealer on convertor they are covered longer due to a problem with them i heard 8 yrs 80000 miles so may be a warranty item GOOD LUCK it only cost me $300 for convertor including installation.

Posted on Jun 05, 2010

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I had the same problem.  I took it to the shop and they diagnosed it as a clogged catalytic converter.  Replaced it for about $600 at the shop and it works really great now.  

Posted on Oct 20, 2008

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