Question about GMC Sierra 3500

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2002 gmc sierra, 3500, 8.1, flashing mil, dies, starts rough idle

I have a 2002 gmc sierra, 3500 with 8.1, the truck will start immediatly(sometimes) and drive but after some time could be minutes to hours it will die. mostly if i'm at stop light or at low speeds less than 40. IF it dies I can pull over wait around 20 seconds and it usually starts a few times it has taken longer up to 30 minutes. The light used to not come on at all, then it started coming on/shutting off. Now it would flash but then it went out. It does Idle rough when at stop and it does seem to be running more rough when driving but could just be me. From my research I heard flashing light is not a good sign. Thought about buying a diagnostic scanner since paying someone to do it will cost just as much, but like everyone else in this economy situation dont' have alot of money. My research shows could be throttle position sensor, idle air control system, catalyc converter

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First buy the alldata subscription for your unit and read the engine power management system, once you understand this then you will see you don't need a scanner, you can code out if it's a engine problem then read the codes itself with a paper clip. Then once you get the codes post them here to get a better answer, the more information you can provide the better the answer you will get. A digital test meter will be better than a scanner. Without understanding the engine management system you won't be able to fix it without replacing a lot of parts.

Posted on Aug 02, 2009

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Posted on Jan 02, 2017

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