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Drew, Super Mazda Tech.
Category: Mazda
Satisfied Customers: 2188
Experience:  19 yrs. experience. Mazda Senior Certified Tech, with Ford, Linc. & Merc. experience. ASE L1 Advanced Certified Master Tech.
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Like everyone else P0303 Cyl 3 missfire, 2007 CX7 has new

Customer Question

like everyone else P0303 Cyl 3 missfire
JA: What is the model/year of your Mazda?
Customer: 2007 CX7 has new coils and plugs
JA: Are you fixing your CX-7 yourself? What have you tried so far?
Customer: No, I am a used car dealer in NC and my regular competent Ford certified and ASE mechanic that rarely gets stumped
JA: Anything else you want the mechanic to know before I connect you?
Customer: none other than that I know about this year models timing chain issue
JA: How many miles on the car? How responsive has your car been lately?
Customer: 119k great other than the Miss
Submitted: 4 months ago.
Category: Mazda
Expert:  Todd M replied 4 months ago.

Hello. My name is ***** ***** I will be attempting to help yo today. My next step would be checking that injector to see if it's spraying properly. Have you tested for spark 'after' you changed the coil?

Customer: replied 4 months ago.
replaced plug again and moved coil packs around
Expert:  Todd M replied 4 months ago.

My next step would be to preform a pressure test on that cylinder. I believe you may find the pressure to be low.