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1993 GMC Suburban Engine suddenly stopped running

Tiny
GREGHOWL
  • MEMBER
  • 1993 GMC SUBURBAN
  • V8
  • 4WD
  • AUTOMATIC
  • 280,000 MILES
While driving my 1993 Suburban 5.7l the engine sputtered a couple of times and then backfired thru the throttle body and stopped running. There is spark but it looks weak, and there is fuel pressure. It has not started since. Thanks in advance
Friday, October 9th, 2009 AT 10:35 AM

2 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Welcome, use a gage and check fuel pressure. Can you see injector spray pattern, engine cranking? I've seen injector spray patterns that looked good to me, TBI system, but the pressure was 5 psi should have been around 10 psi. 5psi wasn't enough to run 5.7 l engine.
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Friday, October 9th, 2009 AT 10:50 AM
Tiny
GREGHOWL
  • MEMBER
  • 2 POSTS
Yes pressure is fine, also just to see if it would light off I sprayed staring fluid in and nothing. When I checked spark at the coil it seemed very weak. I am hoping for a coil failure and not having to replace the timing chain set.
Thanks for your response
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Friday, October 9th, 2009 AT 11:01 AM

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