CAR WANT STAY RUNNING

  • Tiny
  • lesterthebossoneal
  • 1998 Pontiac Bonneville
  • 242,752 miles

My car want run with out holding pedal down. Its a 98 bonneville with no super charger. Ive changed fuel pump. Fuel pressure regulator. Computer, coils, plugs wires, control module, mass airflow, idle air control valve. Checked for vacuum leaks an there arent any, also changed pcv valve and egr an catalytic converter and o2 sensors im stuck

Wednesday, August 8th, 2012 AT 3:08 AM

9 Answers

  • Tiny
  • saturntech9
  • Expert
  • 28,260 posts

Any codes?Also have you checked the coolant temp sensor?

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Wednesday, August 8th, 2012 AT 3:19 AM
  • Tiny
  • lesterthebossoneal
  • Member

No there are no codes an coolant temp sensor has been replaced already

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Wednesday, August 8th, 2012 AT 12:35 PM
  • Tiny
  • saturntech9
  • Expert
  • 28,260 posts

Have you used a fuel pressure gauge to see if your fuel pressure is leaking down to see if maybe the fuel is some how leaking into the engine causing it to flood?

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Wednesday, August 8th, 2012 AT 3:25 PM
  • Tiny
  • lesterthebossoneal
  • Member

Yea it had good pressure no leaks. Computer ecm. Coils. Plugs. Wires. Iac valve. Mass airflow.O2 sensors. Catalytic converter. Intake plenum. Vacuum lines. Cleaned the throttle. Pcv am housing. Tested the injectors. Crank sensor. Control module an harness. Fuel pump an regulator

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Wednesday, August 8th, 2012 AT 3:58 PM
  • Tiny
  • saturntech9
  • Expert
  • 28,260 posts

Do you have a scan tool that reads live engine data?

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Wednesday, August 8th, 2012 AT 4:11 PM
  • Tiny
  • lesterthebossoneal
  • Member

Yes didn't pull any codes or anything of concern just normal reading s

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Wednesday, August 8th, 2012 AT 5:02 PM
  • Tiny
  • saturntech9
  • Expert
  • 28,260 posts

I know you replaced the coolant temp sensor but have you actaually compared the what the computer says for coolant temp with the actual coolant?To make sure its within 10 degrees all the way up till the radiator fan comes on?

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Wednesday, August 8th, 2012 AT 5:17 PM
  • Tiny
  • lesterthebossoneal
  • Member

Yes thermostat opens at right temp antifreeze is full and cmptr shows sensor properly reads

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Wednesday, August 8th, 2012 AT 5:30 PM
  • Tiny
  • saturntech9
  • Expert
  • 28,260 posts

Have you checked cam timing?

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Wednesday, August 8th, 2012 AT 9:12 PM

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