General LSX Automobile Discussion - just got engine installed
07-17-2012, 12:19 PM
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?
07-17-2012, 12:49 PM
does it stay at 2500-3000 or does it go up and down?
07-17-2012, 12:50 PM
It pretty much stays right there
07-17-2012, 01:03 PM
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?
07-17-2012, 01:36 PM
could it be iac or the tps??
07-17-2012, 03:09 PM
07-17-2012, 03:52 PM
If you have a scan tool try post #6 in this post..Iac relearn.http://ls1tech.com/forums/pcm-diagnostics-tuning/1288500-setting-idle-ls1.html
07-17-2012, 09:02 PM
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....
07-17-2012, 10:29 PM
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
07-18-2012, 02:14 AM
Set it and hit it with some low strength loctite.
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