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Engine runs for two seconds and shuts off

Tiny
SEANH51
  • MEMBER
  • 1995 OLDSMOBILE 88
  • 3.8L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 55,000 MILES
3800 mk2 stalled and shut off at idle. Since then have changed crank and cam sensors, all intake gaskets, and temperature sensors. Plugs are soaked in fuel, plugged in scan tool. Injector pulse is at 66ms for cold start. All other data (ambient temperature, water temperature, O2 sensors, TPS) is exact in range. What's happening here?
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Wednesday, July 8th, 2020 AT 12:36 PM

7 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

I would check the fuel pressure regulator. there is a vacuum line on the regulator. Remove it and turn the key on. See if any fuel comes out of the port on the regulator.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

I attached a picture of the location for you.

Roy
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Wednesday, July 8th, 2020 AT 2:16 PM
Tiny
SEANH51
  • MEMBER
  • 4 POSTS
Fuel pressure holds steady at 53 psi. No leaks in the regulator.
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Wednesday, July 8th, 2020 AT 2:25 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, good. Then you must be losing spark.

Does it start right back up after it shuts off?

This could be a module, coils or a crank sensor.

https://www.2carpros.com/articles/how-a-crank-shaft-angle-sensor-works

https://www.2carpros.com/articles/crankshaft-angle-sensor-replacement

https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor

I attached wiring diagrams for you to view. Do you have a test light and a voltmeter to do some testing?

https://www.2carpros.com/articles/how-to-check-wiring

Roy
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Wednesday, July 8th, 2020 AT 2:33 PM
Tiny
SEANH51
  • MEMBER
  • 4 POSTS
I have good spark. I have good fuel pressure and flow. I have compression. The PCM is hanging injectors wide open and flooding cylinders. Only starts and runs for 1 second. Will not restart unless I dry plugs because they are soaking with fuel.
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Wednesday, July 8th, 2020 AT 2:49 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, then you have a bad ECM. The quad drivers are not working correctly.

Roy
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+1
Wednesday, July 8th, 2020 AT 2:55 PM
Tiny
SEANH51
  • MEMBER
  • 4 POSTS
Thank you.
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Wednesday, July 8th, 2020 AT 2:58 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You are welcome.

Always glad to help.

Roy
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Wednesday, July 8th, 2020 AT 3:14 PM

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