Question about 2003 Chevrolet Impala

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Problem with power picking up speed

we have a 2003 impala that starts just fine, has no apparent leaks. the problem is we have no power as far as trying to pick up speed especially when we try to go up a hill. i just would like contact information from the person who had the same problem that contacted gm and had them pay for the repairs for his impala to please email the information so we can also try to have them do the same for us....we have spent alot of money also trying to get this problem diagnosed from 2 tanks of premium gas adding the fuel cleaning stuff, to transmisson flush , tune up.etc.. we are jus asking anyone who had the same problem to please email us with a solution... thank you

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  • Anonymous Feb 11, 2009

    my car feel like it will cut off when i stop. as long as i have my foot on the gaas it seems to run fine. the engine light is on

  • lsantore Apr 12, 2009

    The car runs OK at idle but then hesitates and surges on acceleration and I have the problem mostly above 3000 RPM. At higher speed when I try to pass another vehicle on the highway I have to push the pedal to the floor and when the car goes into passing gear the engine bogs down and the RPM's drop and then there is a loud rattling coming from under the car. The check engine light comes on flashing. Once I take my foot of the gas a little and get out of passing gear and reduce speed, then the check engine light goes back off but I still have a significant loss of power and fuel economy. I replaced the air and fuel filters, used a fuel injector cleaner and made sure my oil and transmission fluid is topped off. I am now thinking O2 sensor or catalytic converter but have no idea for sure.

  • lsantore May 11, 2010

    Do you happen to lnow the TSB number or the campaign number for this and does it only apply to original owners? Thanks!


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There is a TSB technical service bulletin for this car concerning clogged catalytic converters. The dealer will replace it up to 100,000 miles or ten years which ever comes first. Just sent a customer to chevy a month ago with the same complaint

Posted on Feb 01, 2009

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Mine did the same thing. start your car and go to the tailpipe and feel for the exhaust to be coming out. if it is real light on your hand then the cat is clogged. mine would hiss outta the tailpipe after shutting it off lol

Posted on Mar 20, 2009

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