Mazda Repair Questions? Ask Mechanics for Answers ASAP
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Does your car have a misfire and running rough condition??
not all the time, it comes and goes.
Disconnect the battery and touch the cable ends together for 30sec. This will reset the module.
With the engine running wiggle the wiring harness from the engine and ignition coil areas to the PCM. Note any running change.
Let me know if you can duplicate the concern.
Also check to see if check engine light comes back on and what the fault codes are.
I already did the good ole Ford wiggle test. Testing individual modules I get the communication code faults from the instrument cluster. Is this a common problem or a possible problem. The car has about 100k on it now. someone else has been all over it already
Code P0304 and P0303 are for the rear cylinders. Inspect the injector connectors for broken loose connections also.
Yes you are correct.
Now back to the question at hand. I would suspect that you checked the wiring harness connectors and they checked out ok.
1.When you swapped the coils to a different location, did the misfire code change??
2.Do you have a scan tool that can monitor misfire data??
3.After you disconnected the battery and reset the module, which codes came back??
4.Did the U-XXXX codes come back??
Most U-codes are generated because of low battery voltage or module communication software error. If you cleared the U-codes and the didn't come back, don't worry about them. Since a U-code will not cause a misfire concern, lets focus on the misfire codes.
5.Inspect the crankshaft and camshaft position sensors?
6. Check the MAF sensor and the air intake hose between the intake and air cleaner for cracks/torn.
7. Can you watch fuel trims on your scan tool and record the readings during misfire??
Please let me know the answers to all 7 of my questions.