Number four plug not firing

2004 CADILLAC SRX
170,000 MILES • 3.6L • V6 • 2WD • AUTOMATIC
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LOCLAY4474
  • MEMBER
  • 2 POSTS
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?
Nov 12, 2019 at 5:51 AM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 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

Nov 12, 2019 at 6:43 AM
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