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Dave Nova
Dave Nova, Cadillac Technician
Category: Cadillac
Satisfied Customers: 1522
Experience:  ASE Master Certification. GM World Class Certification
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I have misfire codes on cylinder 1 3 5 I have changed the

Customer Question

I have misfire codes on cylinder 1 3 5
I have changed the spark plugs and spark boots today
Cylinder 5 is now OK
But 1,3 are still misfiring causing a rough idle on my 2003 Cadillac cts
Submitted: 2 months ago.
Category: Cadillac
Expert:  AZTechBrian replied 2 months ago.

Hello. The usual cause is a bad ignition coil. Since all the misfiing cylinders are on the same bank, I would suspect that either the coil pack has gone bad, or there is an issue with the wiring or the connector.

Customer: replied 2 months ago.
Coil pack been changed already
Expert:  AZTechBrian replied 2 months ago.

Ok. That hadn't been previously specified. The issue may be somewhere in the wiring, possibly at the connector. Are you positive that cylinder 5 is not misfiring any longer? was any work done under the hood before this started?

Customer: replied 2 months ago.
Some one had been Perviously under the hood before I got it
And when the mechanic checked it it was no longer misfiring
As of the time we checked
Expert:  AZTechBrian replied 2 months ago.

the mechanic released it back to you with no misfires, and then the misfires returned? or he gave it back still misfiring? Did he do a compression test, or a cylinder leak down test?