Question about 2000 Chevrolet Impala

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While driving 40-50 up slight grade. Trans still locked in 4th. I detect what could be called a misfire, but it is too subtle to actually be a misfire. More like a shudder. If TC unlocks or trans shift, it stops.

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  • ghostk9 Jul 03, 2009

    Stops when trans shifts to lower gear and RPM goes up.

  • ghostk9 Jul 03, 2009

    Plugs are good, coils are new. Could EGR valve or O2 sensors cause this? Very high mileage. Did before and after trans was rebuilt.

  • ghostk9 Jul 03, 2009

    No CE lights; would TPS set a code that would turn on the light? Hmmm, maybe intermittant/unstable TPS signal.

  • Mike Butler
    Mike Butler May 11, 2010

    Does it stop when transmission shifts up to next gear, or down? Up to lower RPM's, or Down, to higher RPM's?

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  • Chevrolet Master
  • 3,854 Answers

It sounds like your torque converter is not unlocking. Best thing to do is take it to a transmission shop and have them hook it up to a tech 2 scanner and hope it's will have a DTC code in it's history. it's hard to say what is going on, it could be as simple as a oil and filter change due to the loose of transmission fluid line pressure from dirty filter, or a faulty TPS that sends signal to the ECM that will control the torque converter lockup solenoid and line pressure solenoid. Best thing to do and have it scanned since that is cheaper then and rebuilt transmission of something simple. Oh and check the transmission fluid for level and condition, it should be bright red, not dark like burgundy. Keep me posted, be glad to help you save some money. 

Posted on Jul 03, 2009

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