Question about 1993 GMC Sierra K1500

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1997 gms 1500 with 5.7. replaced fuel pump this summer, this fall engine started stumbiling when accelerating. did basic tune up (plugs, rotor, etc) added injector cleaner. truck continued running bad with occasional backfire. Truck died, finally got it started now will not start unless primed and only runs if constant priming. good fuel pressure - actually seemed a bit high.

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I had an Oldsmobile that was doing the same thing and I also replaced map sensor,crank sensor, cam sensor, electronic module, and many more items. Even put it on a computer scanner and it said that all systems checked out ready to start and run. (and it woudn't even start then unless I primed it)I had done this before I replaced everything. Finally a friend of mine (who was helping me diagnosis this problem and had his on automotive shop)said well the only thing left is the computor and after replacing it never had anymore problems. Hope this information helps.
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Posted on Feb 26, 2009

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Could be map sensor or vacuum leak

Posted on Jan 30, 2009


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