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Cranks but will not start

Tiny
ERICSNYDER011
  • MEMBER
  • 2004 OLDSMOBILE ALERO
  • 3.4L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 190,000 MILES
I have crank but I have no spark. Changed ECM, coil packs, etc.
Tuesday, March 24th, 2020 AT 5:57 AM

3 Replies

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

You need fuel, spark and compression for it to run.

https://www.2carpros.com/articles/car-cranks-but-wont-start

Did you check the fuel pressure? Can you hear the fuel pump run?

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

Did you check for spark? Check at the spark plug while cranking.

https://www.2carpros.com/articles/how-to-test-an-ignition-system

Did you check for compression?

https://www.2carpros.com/articles/how-to-test-engine-compression

Did you have your replacement ECM programmed to your VIN number?

Roy
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Tuesday, March 24th, 2020 AT 6:06 AM
Tiny
ERICSNYDER011
  • MEMBER
  • 2 POSTS
I have done all but program the ECM to my VIN wasn't sure you had to.
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Wednesday, March 25th, 2020 AT 9:32 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Yes, you must for it to operate correctly.

What were the results of all the tests I suggested?

Roy
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Thursday, March 26th, 2020 AT 4:49 AM

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