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LS Swap Rough Idle

This is a discussion on LS Swap Rough Idle within the General Help forums, part of the LSx Technical Help Section category; Need a little trouble shooting help. My car was running perfect up until this past Sunday. I go to start ...

  1. #1
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    LS Swap Rough Idle

    Need a little trouble shooting help. My car was running perfect up until this past Sunday. I go to start it and its idling horribly. I had just driven it friday with no issues! I checked the plugs and they are black with carbon build up so it's running rich. I don't have any vacuum leaks that I can see, it has a speed density tune so the MAF is not the issue, has a brand new Coolant Temp Sensor. The only thing I can think of is the O2 sensors although I'm not getting a code for them on my scanner.

    Any ideas?

  2. #2
    Spaz is My Mentor SMWS6TA's Avatar
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    LS Swap Rough Idle

    check the ict in the throttle body. they get fairly clogged up from oil blow by from the POS pcv system. that could explain some of the build up.

    Cheap gas is another. Or bad gas can explain the rough running too.
    Bignon likes this.
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  3. #3
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    OK, Thanks. I'll check that out.

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