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08 MKZ misfire and ac not working


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5 replies to this topic

#1 josh1506

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Posted 17 February 2016 - 03:27 PM

Have an 08 MKZ that has cylinder 4 misfire. Also the ac stopped working when the misfire happened. I have read about it happening on f150's. Wire insulation was worn and shorted both out. I've tried looking to see if I could find a short or bad wire but cant. Anyone else have a similar probably? I've checked around where wires have contact with engine but cant find it. Any help is appreciated.





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#2 4N1M4L

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Posted 22 February 2016 - 03:10 PM

On my 2010 the compressor wouldn't kick in during a misfire to keep load off the faulted engine. When I replaced the faulty injector the ac came right back. Be careful driving on misfires. It can lead to a ruined catalytic converter if left that way.
  • drolds1 likes this

#3 josh1506

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Posted 22 February 2016 - 06:37 PM

I had someone check it out the wiring and found nothing wrong. But the #4 cylinder will not fire. I thought maybe it was a short or something but he couldn't find anything. I have read of the pcm going out and was hoping that wasn't the problem.

#4 drolds1

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Posted 23 February 2016 - 03:23 AM

Have you inspected the coil on that cylinder?  Is it blistered, burnt or cracked?  Did you try swapping coils to see if that cylinder fires with a known good COP?

 

You haven't mentioned if the CEL is lit.  If so, what are the code(s)?

 

What usually happened with these is that a bad coil took out the ECM, not the other way around.  There was a TSB for coil/ECM failures in certain instances.

 

As 4N1M4L states, don't drive the car with a misfire. You don't want to be paying for catalytic converters on top of the existing problem.



#5 josh1506

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Posted 23 February 2016 - 12:17 PM

Cel was on for cylinder #4 misfire. Check coil and looked fine. Replaced coil with new one and new plug and still dead. Swapped out other coils and still the same. He told me there was power to the coil but not a stable ground from the pcm.

#6 4N1M4L

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Posted 04 March 2016 - 12:36 AM

Injector??






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