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Number four plug not firing

Tiny
LOCLAY4474
  • MEMBER
  • 2004 CADILLAC SRX
  • 3.6L
  • V6
  • 2WD
  • AUTOMATIC
  • 170,000 MILES
Just replaced all injectors and coils and number four not firing at all. Can unplug coil and makes no difference in running. I ordered a used ECM and now rethinking that. The one I bought has the exact same numbers on it but now I was told I may have to have it programmed. Is programming a big deal and what is cost. This car was given to us for a second car and run great until this problem started. Any suggestions?
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Tuesday, November 12th, 2019 AT 1:51 PM

1 Reply

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

The first thing I would do is check the compression.

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

You have thrown a lot of parts at it with no success and now it is time to do the proper testing to determine the issue.

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

Yes, it needs to be programmed to your VIN. That runs about $150.00.

Roy

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Tuesday, November 12th, 2019 AT 2:43 PM

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