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GM Tech (Cam)
GM Tech (Cam), Pontiac Technician
Category: Pontiac
Satisfied Customers: 2373
Experience:  GM Grand Master Technician 2007. 14 years experience.
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1990 BONNEVILE 3.8. RUNS GREAT UNTILL GETS HOT. MISFIRE AND

Customer Question

1990 BONNEVILE 3.8. RUNS GREAT UNTILL GETS HOT. MISFIRE AND THEN STALLS FUEL PRESSURE OK. CHANGED CRANK SENSOR. O2 SENSOR WAS DEAD REPLACED.
Submitted: 9 months ago.
Category: Pontiac
Expert:  Roy Belding replied 9 months ago.

good morning my name is ***** ***** I will assist

what is the actual fuel pressure when it is running and when it wont start???

Roy

Customer: replied 8 months ago.
Fuel pressure is good 45psi disconnect pressure sensor jumps to 55
Expert:  Roy Belding replied 8 months ago.

Ignition ON Engine OFF40.5 to 47.0 psi

With Regulator Vacuum Applied [1]3.0 - 10.0 psi Less than Ignition ON Engine OFF

REMARKS:
[1]
May be checked with either of the following methods.

  • With Pressure Regulator Vacuum Line Attached at normal idle speed.
  • Ignition ON Engine OFF with 10 Inches Of Vacuum Applied To The Pressure Regulator.

good, did you verify the pressure when it stalls out??? the pump may be good cold but seize up when hot

Roy

Expert:  Roy Belding replied 8 months ago.

how are you making out

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