Question about 2003 Chevrolet Aveo

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I drove a 2003 chevrolet aveo hatchback 1.5L SOCH GM E-Tec II engine AT. My car suddenly lost a lot of power during overtaking another vehicle or climbing hill specially when it's in hot weather although the rpm almost hit the redline. The transmission doesn't shift to a higher gear position even though the engine already give enough power to the transmission, i had to release the throttle so the transmission can shift to a suitable gear position. These problem cause high fuel usage and also unnecessary roaring engine sound but no power. My aveo is a AT transmission so i think it is not a clutch problems. There also no smoke come out for the exhaust when i extremely push the throttle.

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  • Aidy Jon Sep 03, 2010

    The "check engine" light off. But i noticed there's something different with the sound of the exhaust system. It was bit rough. When i drove my car in normally( in city area where the roads are flat ) my car can go form idle position to 40mph smoothly (took about 12-15 seconds) and the transmission shifted normally, but the problem occur when i push the engine bit hard for example when i want to climb a hill or overtake another vehicle the engine will roar to the redline and only shifted if i release the throttle a bit. Imagine in 2nd gear position the engine roar to 6000rpm but the car only goes 15-20mph.

  • Aidy Jon Sep 21, 2010

    Thank you for you advise, i have checked my car's exhaust system and as you said there was a blockage in the catalytic converter. After i changed the cat con, my car seem back to the normal performance. thanks.

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  • Chevrolet Master
  • 8,522 Answers

If you are saying there is no exhaust coming out the tailpipe, you have a blockage in your exhaust. Either the catalytic converter or the muffler has failed closed. Take the car to a muffler shop to diagnose which part needs to be replaced (they will need to break open the exhaust between these components).

Posted on Sep 03, 2010

  • 1 more comment 
  • Aidy Jon Sep 03, 2010

    I meant there's no black or white smoke coming out the tailpipe, that means my engine's piston ring still in good condition. If there's a blockage in my exhaust system probably my engine will be hard to start or it will hard to get to 5000-6000 rpm. My engine response was good, is like my engine have power but it fail to channel does power to the transmission. I still don't know why my car lost so much power.

  • Jeff Turcotte
    Jeff Turcotte Sep 03, 2010

    OK, the transmission uses engine vacuum to decide when to shift. You should check for vacuum leaks, especially if there are any hoses leading to the transmission. Also check any other hoses that are coming from the top of the engine (intake manifold). Is the "check engine" light on?

  • Jeff Turcotte
    Jeff Turcotte Sep 03, 2010

    OK, in addition to checking for vacuum leaks, also check the transmission fluid level and color.

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