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Skip at idle

This is a discussion on Skip at idle within the General Help forums, part of the LSx Technical Help Section category; My LQ4 silverado is skipping at idle. I just changed the head gaskets and everything seems to be in order ...

  1. #1
    Junior Member Matt Smith's Avatar
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    Skip at idle

    My LQ4 silverado is skipping at idle. I just changed the head gaskets and everything seems to be in order as far as installation, compression, and sealing. It only does it at idle; once the throttle is pressed it ceases. MAF sensor maybe?

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    Member jb3golf's Avatar
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    Quote Originally Posted by Matt Smith View Post
    My LQ4 silverado is skipping at idle. I just changed the head gaskets and everything seems to be in order as far as installation, compression, and sealing. It only does it at idle; once the throttle is pressed it ceases. MAF sensor maybe?
    I would re-check all your lines, and make sure everything is tight. ..If you weren't having issues with the idle before your install..then go over the small details...good luck..

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    Junior Member Matt Smith's Avatar
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    Thanks for the guidance. I also meant to bring up that it's burning very rich at idle. I also unplugged the MAF sensor at idle at it began to idle fine.

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    Smiles for 9.5 Years cammed goat's Avatar
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    Clean the MAF with C&C MAF cleaner and see if it works. If not, your MAF is probably on its way out. Has the MAF ever been cleaned? How many miles on your rig?

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    Junior Member Matt Smith's Avatar
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    156,000. It finally threw an active fault and CEL after I cleaned the MAF. it doesn't skip anymore but it idles high and it stumbles when the throttle is pressed.

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    Smiles for 9.5 Years cammed goat's Avatar
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    Might have to clean your IAC valve next to get that idle issue sorted.

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    Junior Member Matt Smith's Avatar
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    I cleaned the MAF sensor. Didn't work so I got a new one. And it still idles weird. I'm looking at it being the IAC. I'm gonna clean that then see. When I go to work tomorrow I'll be able to test it. I don't have a VOM in my toolbox here.

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    Yea, replacing parts on a hunch is a bad idea.

    Have you checked for vacuum leaks? Running rich and poor idle both can be contributed to a vacuum leak.
    It's on jackstands.

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    Smiles for 9.5 Years cammed goat's Avatar
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    I agree with Jon. With these vehicles, clean MAF, throttle body and IAC as well as check for vacuum leaks. From what I have seen in person as well as on the forums, changing the MAF is a 50/50 chance fix. Sometimes the replacement works, sometimes it doesn't.

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    Can you be more specific -- "idles weird" means what?

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    Junior Member Matt Smith's Avatar
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    I was able to find the cause. After I tested the IAC I decided to try some ether just to check if the intake wasn't sealed. And the EGR was the cause. It had a slight vacuum leak. So I fabed a cover for it and the headers. Fixed the idle issue.
    SMWS6TA likes this.

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    Good work - tracking down idle issues can be an exercise in patience.

  13. #13
    Smiles for 9.5 Years cammed goat's Avatar
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    Good to hear.

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