Stumped!
08-29-2019, 09:13 PM
#1
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Stumped! Hello. New to this. I have a freshly rebuilt ls2 stroker 402. Runs great. Close to 500 rwhp. Recently it just started acting erratically and shutting off after it gets warmed up. Runs great cool. Can't drive it. It's not overheating . Any suggestions?
08-30-2019, 10:39 AM
#3
TECH Resident
Assuming that the engine ran fine at some point and then started acting up, I'd say throw a cheap scan tool on it and watch the front O2 sensors. Usually when an engine only acts up when warm it's O2, vacuum leak or electric fans pulling too much power when they kick on. I've experienced all of these issues over the years in different GMs
08-30-2019, 05:08 PM
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Assuming that the engine ran fine at some point and then started acting up, I'd say throw a cheap scan tool on it and watch the front O2 sensors. Usually when an engine only acts up when warm it's O2, vacuum leak or electric fans pulling too much power when they kick on. I've experienced all of these issues over the years in different GMs
11-01-2019, 05:11 PM
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Ok Still stumped. Same ls2. Fixed the shutting off problem. Was the header bolts?. New problem. When started idles fine then if hit the gas no matter how much the idle jumps to 2000. Put in gear it drops and back in park stays normal till the gas is pushed again then back to 2000. Any help would be appreciated. Thanks