My 1992 GMC Sierra will start but will only run for 20 seconds exactly.

Asked by 808gordon Apr 16, 2015 at 02:26 PM about the 1992 GMC Sierra 1500

Question type: Maintenance & Repair

My 1992 GMC Sierra will start but will only run for 20 seconds exactly. Change fuel pump, fuel relay, tested computer. Swapped computers, Replaced Cap and it still runs for only 20 seconds.

3 Answers

cbpatterson answered 9 years ago

My 1994 GMC Is doing the same thing. If I unhook the small wire from the altinator it will run but I still don't know how to fix it.

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