LS376/480 won't idle

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Apr 24, 2009 | 07:03 PM

braggr1

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From: Oregon

LS376/480 won't idle

New 2008 LS3 GMPP create engine won't idle. Runs great, just won't always idle. Any thoughts? Am using GMPP harness and ECM.

Apr 25, 2009 | 09:41 AM

Haans249

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From: Fort Worth, TX

Are you getting proper voltage at idle?

Apr 27, 2009 | 12:22 AM

bmxer8699

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From: dfw

No idea what the could be

Last edited by bmxer8699; Jul 2, 2009 at 04:11 AM.

Apr 27, 2009 | 08:19 AM

Haans249

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From: Fort Worth, TX

Quote:

Originally Posted by bmxer8699

i have this same problem same motor.. and am using the ls1 computer with a lingenfelter converter box.
Starting the car it idles fine, idle is set at 950 with that hot cam. and still once leaving after first starting the car the idle dips and the i have to fight with it to keep it idling.

You have to work out your throttle follower, desired airflow, spark, and AFR's to get your car to idle off throttle without stalling. If its too rich/lean coming down to idle it'll bog/stall. If your throttle follower decays too quickly or is too small for the larger motor it'll bog/stall etc... Idle tuning can be a real hassle if you don't know what to look for.

Nov 20, 2011 | 08:17 PM

LS6Nick

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I just installed a LS376/480 in my 68 C10 truck with a 4L80e and Speartech controller. When at a stop light, the truck wants to surge forward and feels like it is going to stall. Also, hot starts are like I have a carburator and the thing is really sucking fuel. Any ideas on how to fix it?