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Thread: Malibu ECM/ECU Questions

  1. #1
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    Malibu ECM/ECU Questions

    I drive a 2002 Chevy Malibu with 3.1L V-6, automatic, with a/c and cruise.
    It surges/revs/chuggles at highway speeds by 100-300 rpm. It sometimes
    does it enough to kick it out of cruise-control. We first addressed it as an
    engine-problem. We changed fuel-injectors, MAF sensor and brake-switch.
    It still did it. We re-flashed the ECM/ECU. No go.

    So, we changed the torque-converter, torque-converter clutch, solenoid,
    hydraulic-valve, shaft and seal. It still does it.

    Next, we disconnected the cruise-control. It still does it. We re-flashed the
    ECM/ECU again. It still does it. One tech feels it may be a glitch in the ECM/
    ECU itself. I have a re-manufactured one on order. Any thoughts or suggestions as to what it could be or what to try next? This has been going
    on since April......

  2. #2
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    Question 2002 Malibu Rev/Surge - ongoing....

    I now have a re-man ECM/ECU in my possession. Two different avenues of advice have been received concerning it. One is to take it to the GM-dealer and have them re-flash and have a trustworthy auto-electric tech install it OR take
    the unit to the dealer, have them install it and then re-flash it. Any suggestions?

  3. #3
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    I'm curious as to why you would come to a CarPC forum and ask a question like this?
    Jan Bennett
    FS: VW MKIV Bezel for 8" Lilliput - 95% Finished

    Please post on the forums! Chances are, someone else has or will have the same questions as you!

  4. #4
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    Why come here?

    I was advised to by another gent. He said that maybe those with PC
    experience would know the answers to my questions about the ECM/ECU.

  5. #5
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    Since it's a 2002 it should be OBD-II - meaning you should be able to go to an auto parts store and have them scan it for codes that are being thrown with a scan tool. It should give you an idea about what's going on.
    Jan Bennett
    FS: VW MKIV Bezel for 8" Lilliput - 95% Finished

    Please post on the forums! Chances are, someone else has or will have the same questions as you!

  6. #6
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    2002 Malibu follow-up....

    I have brought it to a dealer, an auto-tech and a "Precision AutoTune".
    No luck in retrieving any codes. None have been read. No "service engine
    soon", only the rev/surge/chuggle of 100 to 300 rpm at highway speeds.
    I suspect it does not last long enough to code. Even when the tech was
    on the road with a partner and reading his scanner, they did not get any
    readable code, yet he said it did it often enough to kick the vehicle out
    of cruise-control. Thus far, we are all stumped. I will go on the Chevrolet
    Forum and see what I can find out there. Thanks for your input. I will not
    be a bother here again. Ciao.

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