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Tim Mohr
Tim Mohr, ASE MASTER TECH
Category: Nissan
Satisfied Customers: 560
Experience:  30 YRS EXPERIENCE, FOREIGN AND DOMESTIC, GAS AND DEISEL
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Altima: 2010 nissan altima cylinder 4 missfire no ground p

Customer Question

2010 nissan altima cylinder 4 missfire no ground pulsating
Submitted: 1 year ago.
Category: Nissan
Expert:  Roy Belding replied 1 year ago.
good afternoon my name is ***** ***** I will assist 2 possibilities. the crank sensor controls injector pulsations. if it is bad, it will not toggle themthe other is the pcm. the crank sensor sends the signal to the pcm and based on that info, it fires the injectors.does the tach show rpm while cranking?? Roy
Customer: replied 1 year ago.
Its not sparking from sylinder 4 it turns on and runs just dosebt have any spark
Expert:  Roy Belding replied 1 year ago.
ok, spark not coming from one cylinder indicates a possible bad pcm Roy
Customer: replied 1 year ago.
I sent the pcm out already to be fixed and its still doing it
Expert:  Roy Belding replied 1 year ago.
ok, thats new info you never posted. what else have you done??? Roy
Customer: replied 1 year ago.
I tryed new spark plugs and new coils also...do you know what wires from cylinder 4 go to the pcm connector?
Customer: replied 1 year ago.
I checked for power at the coil an it has 2 positives and 1 ground
Expert:  Roy Belding replied 1 year ago.
the coil has a 12 volt feed, ground and signal wire to the pcm. do you have a scan tool?? the pcm quad driver inside is what controls the coil firing.I am leary about the pcm even though it has been re built or repaired. it still may be the issue Roy