General LSX Automobile Discussion Non-technical LSX related topics.

just got engine installed

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Old Jul 17, 2012 | 12:19 PM
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Default just got engine installed

ok i just got my lq4 with ls3 heads, ls3 intake, and a fairly large cam. But here the problem i can start it up and let it idle and it fine but once it driven just a little bit like 20 feet the idle jumps to 2500-3000 rpms it isn't dyno tuned yet but it has a tune put on it to make it run from the guy thats going to tune the car. So I'm not sure what the problem is?
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Old Jul 17, 2012 | 12:49 PM
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does it stay at 2500-3000 or does it go up and down?
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Old Jul 17, 2012 | 12:50 PM
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It pretty much stays right there
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Old Jul 17, 2012 | 01:03 PM
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just drove it again its stays at 3,000 rpms now. before i could turn the screw out on the throttle body and it would stay down until i drove it and now I'm out of room to adjust the throttle body. Any ideas?
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Old Jul 17, 2012 | 01:36 PM
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could it be iac or the tps??
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Old Jul 17, 2012 | 03:09 PM
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anyone?
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Old Jul 17, 2012 | 03:52 PM
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If you have a scan tool try post #6 in this post..Iac relearn.https://ls1tech.com/forums/pcm-diagn...-idle-ls1.html
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Old Jul 17, 2012 | 09:02 PM
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from what i understand the l92/ls3 heads don't need a large cam. can actually hurt performance. did you select the cam yourself or did someone spec it for you?

no idea if it relates to you're problem though....
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Old Jul 17, 2012 | 10:29 PM
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i guess "large" was a bad description lol it was spec'd for the l92 ls3 heads and I think i got it figured out the idle adjustment screw tightens its self up and raises the idle so i just have to find a way to keep the screw in one spot
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Old Jul 18, 2012 | 02:14 AM
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Set it and hit it with some low strength loctite.
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