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Car want stay running

Tiny
LESTERTHEBOSSONEAL
  • MEMBER
  • 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
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Wednesday, August 8th, 2012 AT 3:08 AM

9 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Any codes?Also have you checked the coolant temp sensor?
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Monday, November 5th, 2018 AT 7:09 PM
Tiny
LESTERTHEBOSSONEAL
  • MEMBER
  • 5 POSTS
No there are no codes an coolant temp sensor has been replaced already
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Monday, November 5th, 2018 AT 7:09 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 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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Monday, November 5th, 2018 AT 7:09 PM
Tiny
LESTERTHEBOSSONEAL
  • MEMBER
  • 5 POSTS
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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Monday, November 5th, 2018 AT 7:09 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Do you have a scan tool that reads live engine data?
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Monday, November 5th, 2018 AT 7:09 PM
Tiny
LESTERTHEBOSSONEAL
  • MEMBER
  • 5 POSTS
Yes didn't pull any codes or anything of concern just normal reading s
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Monday, November 5th, 2018 AT 7:09 PM
Tiny
SATURNTECH9
  • MECHANIC
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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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Monday, November 5th, 2018 AT 7:09 PM
Tiny
LESTERTHEBOSSONEAL
  • MEMBER
  • 5 POSTS
Yes thermostat opens at right temp antifreeze is full and cmptr shows sensor properly reads
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Monday, November 5th, 2018 AT 7:09 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Have you checked cam timing?
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Monday, November 5th, 2018 AT 7:09 PM

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