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1990 GMC C1500 starts then 2 sec. Later dies

Tiny
BRETTYBOY
  • MEMBER
  • 1990 GMC C1500
  • V8
  • 2WD
  • AUTOMATIC
  • 250,000 MILES
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.
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Saturday, January 5th, 2008 AT 7:52 PM

3 Replies

Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,749 POSTS
Yes oil pressure switch could cause this. Does vehicle run on carb cleaner or starter fluid?
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Saturday, January 5th, 2008 AT 7:56 PM
Tiny
BRETTYBOY
  • MEMBER
  • 2 POSTS
It will try to start if I squirt fuel into the tbi
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Saturday, January 5th, 2008 AT 8:01 PM
Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,749 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?
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Saturday, January 5th, 2008 AT 8:13 PM

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