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Cranks will not start

Tiny
CWBY0205
  • MEMBER
  • 2004 OLDSMOBILE ALERO
  • 3.4L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
Have already spent money just doing the replace and hope, but nothing has worked.I have replaced both crank position sensors, the cam position sensor, the ignition module, and the computer. I have spark and 53 pounds of fuel pressure, have not checked for power at the individual injectors. When cranking then fuel pressure stays constant most the time sometimes the needle moves. The engine will occasionally fire but will not run. With this information can you speculate on what my issue is?
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Wednesday, August 21st, 2019 AT 8:35 AM

9 Replies

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

52 is the bare minimum for the fuel pressure.

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

If you spray some starting fluid into the air filter, will it start and stall?

Did you check the compression to be sure the engine timing is correct?

Did you have the new PCM flashed to your VIN?

https://www.2carpros.com/articles/how-a-car-computer-works-pcm-ecm-bcm

Roy
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Wednesday, August 21st, 2019 AT 1:34 PM
Tiny
CWBY0205
  • MEMBER
  • 5 POSTS
Yes, the new PCM was flashed to the VIN number. I have had the front of the motor apart to view timing chain everything was clean with no filings and timing marks appeared to line-up. No the starting fluid will not make it fire. If it doesn’t fire is that a lack of compression deal for sure? So the way it sounds your thinking the chain jumped and threw it out of time then.
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Wednesday, August 21st, 2019 AT 3:33 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
That is why I suggested a compression test. Just do the front three and see how much compression you have.

Roy
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Wednesday, August 21st, 2019 AT 3:35 PM
Tiny
CWBY0205
  • MEMBER
  • 5 POSTS
I will do that need to borrow a gauge so it may be a day or two.
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Wednesday, August 21st, 2019 AT 5:00 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Sounds like a plan.

Keep me updated.

Roy
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Thursday, August 22nd, 2019 AT 2:15 AM
Tiny
CWBY0205
  • MEMBER
  • 5 POSTS
Alright I have compression checked #2, #4, #6 and have 49 lbs on 2, 0 lbs on 4 and 6.
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Thursday, August 22nd, 2019 AT 4:39 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
There is your issue. You have no compression.

It should be at least 130 lbs.

Sounds like you should start with a timing chain since they are all low.

Roy
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Thursday, August 22nd, 2019 AT 4:42 PM
Tiny
CWBY0205
  • MEMBER
  • 5 POSTS
That’s what I was thinking so I’ll put it in this weekend and update you when I’m done
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Thursday, August 22nd, 2019 AT 5:03 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Sounds like a plan.

Roy
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Thursday, August 22nd, 2019 AT 5:09 PM

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