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Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > ZJ Grand Cherokee Forum > Not firing on cylinder 4 and 5

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Unread 07-16-2014, 08:25 PM   #1
95gc
Registered User
1995 ZJ 
 
Join Date: Dec 2006
Location: Cincinnati, OH
Posts: 59
Not firing on cylinder 4 and 5

3 days ago I parked my ZJ and it was running fine. The next morning I decided that I was going to treat it to some exhaust work at the local shop. It had developed a misfire overnight. I drove it a couple of miles and it got worse.

Started by pulling the spark plug wires to determine which cylinders weren't firing...4 and 5 were the issue so I pulled the plugs and they looked worn out (brownish color and very large gap). I replace all of them and it didn't fix the issue.

I then checked for trouble codes and got code 27(Injector #3, and/or 4, and/or 5, and/or 6 output driver does not respond properly to the control signal. )

Next I looked at the injectors. All voltage and ohm measurements checked out but I still pulled the injectors and threw in 2 that I got from the local junk yard just in case. Still has the same issue.

I'm not sure where to look next. Any suggestions?

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Unread 07-17-2014, 08:13 AM   #2
zjosh93
Registered User
1993 ZJ 
 
Join Date: Aug 2010
Location: Austin
Posts: 1,323
The first time my coil went bad it had a misfire. I checked for spark and it had spark it just was too weak to fire sometimes. Might be worth checking.

Wasn't there also a post recently about not having spark on 1 and 6 that was caused by a bad CPS? Might check that out too.
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injector , misfire

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