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2001 LS1 Firebird hard to start

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  1. #1
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    2001 LS1 Firebird hard to start

    I took it into a local shop after replacing the battery. The engine is turning, good fuel pressure, but we arenít getting spark. The coils are good, but it hard to test because after about 5 minutes if troubleshooting the car will fire up. No codes and it will run fine. It will continue to start most of the day after that with no problem. The shop is thinking it could be the computer, but says theyíre back ordered at local dealership. Any thoughts? Should I try another shop? Iím happy to try to swap a PCM myself if thatís the issue.

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    Spaz is My Mentor SMWS6TA's Avatar
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    Possible bad grounds.


    If it was the ecm it would not run at all.

    Also could be a VATS issue too.

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    Quote Originally Posted by SMWS6TA View Post
    Possible bad grounds.


    If it was the ecm it would not run at all.

    Also could be a VATS issue too.
    I suggested the bad ground as a I had that issue once before, but in that case it caused the car to misfire bad under load. Regardless, I hope they check it before giving up.

    Iím inclined to agree with you about the ECM, hence this posting. It also doesnít make sense to me that the problem would go away after the engine has started and ran for a little while. After struggling to start the car, once it does fire up, I can run errands all over town, shutting if off and cranking the car back up without issue.

    The VATS is an interesting idea, but wouldnít that prevent the engine from turning? Anytime Iíve had issues with the key not making a good connection for whatever reason, the engine wouldnít even try to turn.

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    Super Moderator pajeff02's Avatar
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    +1 on a ground issue. Also, check the connectors at the PCM (sometimes the pins have issues) and VATS remains a possibility. Just for giggles, do you have a spare key to try?

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    Also crank sensor can be an issue

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