1990 GMC C1500 starts then 2 sec. later dies

1990 GMC C1500

250,000 MILES • V8 • 2WD • AUTOMATIC

BRETTYBOY

MEMBER
2 POSTS

I have checked fuel filter, battery and alternator are good, Ignition module has tested good, found vacumm lines bad and fixed. don't know how to test iac. can't find the tee and fuel pressure test gauge required to test pressure. Is the egr valve diaframe supposed to bleed by or should it hold vacumm. the truck was running then one day just quit with the above mentioned problem. can oil pressure switch cause this? lots of questions, sorry. by the way, when changing fuel filter, fuel squirted as i loosened connections. fuel pump is working but I don,t know how well.

Jan 5, 2008 at 7:52 PM

MASTERTECHTIM

✓ASE Certified Mechanic
4,750 POSTS

yes oil pressure switch could cause this. does vehicle run on carb cleaner or starter fluid?

Jan 5, 2008 at 7:56 PM

BRETTYBOY

MEMBER
2 POSTS

[quote:e0ff657482="mastertechtim"]yes oil pressure switch could cause this. does vehicle run on carb cleaner or starter fluid?[/quote:e0ff657482]
It will try to start if I squirt fuel into the tbi

Jan 5, 2008 at 8:01 PM

MASTERTECHTIM

✓ASE Certified Mechanic
4,750 POSTS

if there was a fuel problem it would run fine on carb cleaner. back to basics, is it possible the plugs are now fouled from repeated unsuccessful attempts to start. does vehicle have spark?

Jan 5, 2008 at 8:13 PM

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