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Jared D
Jared D, ASE Certified Technician
Category: Mazda
Satisfied Customers: 1914
Experience:  Shop Supervisor at County Fleet
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I have just replaced my pcv valve and replaced the cmp

Customer Question

I have just replaced my pcv valve and replaced the cmp sensor because I had the code and now the car barely runs and stalls out.
JA: Is the check engine light on? Does the car stall at idle or when driving?
Customer: Yes it barely idles and cel is on however if I install old sensor the engine runs but smokes a little
JA: What is the model/year of your Mazda?
Customer: 2004 Mazda 6 2.3 l
JA: Are you fixing your Mazda2 yourself? What have you tried so far?
Customer: The car was smoking very badly and cel was on. Checked codes an had cmp fault. I replaced the cmp and pcv valve and the car barely runs. If I install old sensor the car runs but doesn't smoke as much
JA: Anything else you want the mechanic to know before I connect you?
Customer: That is all
Submitted: 1 year ago.
Category: Mazda
Expert:  Jared D replied 1 year ago.

Most of the Mazdas won't run without a cam variation relearn procedure if you replace the CMP sensor. Do you have a scan tool to perform the relearn?

As far as the smoking goes it might be related to the timing issue, but a stuck open PVC is a much more likely cause. If you already swapped the PCV then I would suggest to let the system burn out residual oil once you get the cam variation set and see if it clears up.

Expert:  Jared D replied 12 months ago.

Please let me know if you need additional information.