LS1TECH - Camaro and Firebird Forum Discussion

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- - LS376/480 won't idle (https://ls1tech.com/forums/generation-iv-internal-engine/1106477-ls376-480-wont-idle.html)

braggr1

Apr 24, 2009 07:03 PM

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.:confused:

Haans249

Apr 25, 2009 09:41 AM

Are you getting proper voltage at idle?

bmxer8699

Apr 27, 2009 12:22 AM

No idea what the could be

Haans249

Apr 27, 2009 08:19 AM

Quote:

Originally Posted by bmxer8699 (Post 11499443)

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.

LS6Nick

Nov 20, 2011 08:17 PM

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?

Jimbo1367

Nov 27, 2011 11:03 AM

Quote:

Originally Posted by LS6Nick (Post 15644782)

Take it to a good chassis dyno tuner

cam	Nov 27, 2011 01:20 PM

Check for vacuum leaks. Also bump timing in lower RPM if you have swapped cams

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