Not firing on cylinder 4 and 5 - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > ZJ Grand Cherokee Forum > Not firing on cylinder 4 and 5

FS: 2007-2013 Jeep Wrangler "HALO" Angel Eye KitFS: Wranger BRIGHT License Plate LED! Just $3! Great valueIntroducing MONSTALINER™ UV Permanent DIY Roll On Bed Line

Reply
Unread 07-16-2014, 07:25 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?

95gc is offline   Reply With Quote
Unread 07-17-2014, 07:13 AM   #2
zjosh93
Registered User
1993 ZJ 
 
Join Date: Aug 2010
Location: Austin
Posts: 1,192
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.
zjosh93 is offline   Reply With Quote




Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.