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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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Rough idle started and gradually got worse over a couple of

Customer Question

Rough idle started and gradually got worse over a couple of weeks. Now it has rough idle, loss of power when accelerator is pressed and missing badly. Scan shows camshaft position bank b, misfire on cylinders 2,4,6 and now 1.
JA: Is the rough idle intermittent or consistent?
Customer: Consistent.
JA: What is the model/year of your Cadillac?
Customer: 2007 CTS 3.6
JA: Are you fixing your CTS yourself? What have you tried so far?
Customer: I have had a mechanic look at it and try to diagnose. So far we have replaced both Cam Shaft Position Sensors on Bank 2. No Change. Checked voltage to the coils, good. Checked the pins on the PCM, good. Disconnected the Catalytic Converter, no change.
JA: Anything else you want the mechanic to know before I connect you?
Customer: I just replaced the plugs and one of the coil packs within the last few weeks. Should I replace all of the coil packs?
Submitted: 10 days ago.
Category: Cadillac
Expert:  Chris (aka- Moose) replied 10 days ago.

Welcome, I'm Chris (aka Moose).

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Can you check the compression on the side that is misfiring?

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