I have a 1991 Chevy K1500 5.7 truck. The truck is hard to start and when it does start it will not idle.

Tiny
MRKSMAN00
  • MEMBER
  • 1991 CHEVROLET SILVERADO
  • 14,000 MILES
This truck is hard to start and will not idle. I have replaced the tps, map sensor and coolant temp sensor. I have rebuilt the tbi new intake gasket, checked fuel pressure replaced fuel filter. Checked plugs wires and distributor. I can get the truck to run for a few minutes if I feather the throttle and it warms up if the map sensor vacuum line to the tbi is unhooked and the coolant temp sensor is unplugged. The minute either of these are hooked back up the truck dies.
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Monday, March 26th, 2012 AT 3:45 AM

2 Replies

Tiny
ASEMASTER6371
  • EXPERT
What was the exact fuel pressure? It is critical to the operation of the truck.
Make sure the cat is not clogged as well.

Roy
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Monday, March 26th, 2012 AT 3:49 AM
Tiny
MRKSMAN00
  • MEMBER
The fuel pressure was 13 psi and this truck does not have a cat
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Sunday, April 1st, 2012 AT 2:36 AM

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