Duramax Diesels Forum Truck of the Week
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Old 08-30-2018, 05:44 AM
blown1967camaro blown1967camaro is offline
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Join Date: Mar 2014
Posts: 14
Default 2015 gmc hard start after warmed up Need Help

Truck starts right up when cold but once it gets to temp and try to shut off/start it turns over 2-4 seconds, Truck had a tune with a 5 position switch before I bought it and exhaust. Egr was already unplugged from the tune so we romoved it along with the def tank. Also added a lift pump and removed the filter head.

Had a fuel pressure regulator code so we changed the one on the rail but still have them wed start issue. Gonna see if I can get scanner to check fuel pressure at the pump, that control valve would be my next guess
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