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  #13  
Old 09-18-2013, 02:27 AM
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Re: 1999 cherokee o2 sensor mess

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Originally Posted by jeepman465 View Post
How do I swap coils? I've never done that before? And it wasn't a mopar crank sensor so I might have to go to the steelership and get one lol.
I was with my head with the 4.7 engine, which has separate coils for each cylinder. The 4.0 has a coil rail which needs to be changed as an assy.
If you have a scanner you better first erase the PCM memory and then see after some test driving which one(s) come back. (if you don't have a scanner, you could try any local garage or if you have an Android phone use the app Torque and buy a bluetooth dongle and you have your own scanner).
Check also if the crank sensor connector is fitting well, when its not locked, it could cause intermittent problems.
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  #14  
Old 09-18-2013, 02:34 AM
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Ok yes I have the 4.0. I'll reset the codes and drive it for a bit. And I'll check the connection on the crank sensor. $132 bucks for a new coil pack that sucks.
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Old 09-18-2013, 10:13 PM
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Well I reset the codes and it's didn't help much. Starting to be a real headache. Might end up breaking down and just bring it to a local shop to get it fixed once and for all.
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Old 09-18-2013, 10:33 PM
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Re: 1999 cherokee o2 sensor mess

Did all the same codes come back?
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Old 09-18-2013, 10:35 PM
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Yes they did so I'm not sure. I can have the shop test to see if the coil and crank sensor is what's bad then depending on what they want to charge I'll either do it myself or have them do it.
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Old 09-18-2013, 10:42 PM
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Re: 1999 cherokee o2 sensor mess

I don't know if your 1999 4.0 ignition system is the same as for the 2004. On the 2004 there are 3 coils in the rail. Each coil fires two cylinders at the same time, from which one spark is waisted. Since yours only says ignition coil #3 circuit, i wonder if the 1999 has an other type of ignition coil. Maybe an other member with experience on this can chime in.
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Old 09-18-2013, 10:52 PM
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There are three black boxes on the coil so would imagine that's the same as your talking about.

image-957269355.jpg
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Old 09-18-2013, 10:59 PM
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Re: 1999 cherokee o2 sensor mess

Seems to be the same yes. Look for a connector to this assy and remove/clean/reconnect it. You could also measure the wiring from the PCM to this connector, to be sure that there is continuity, and check for no continuity between theses wires and ground. On my work now and can't attach wiring diagram now.
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  #21  
Old 09-18-2013, 11:01 PM
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Ok thanks. When ever you get a chance post that for me.
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Old 09-19-2013, 12:26 PM
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Re: 1999 cherokee o2 sensor mess

Here you go. Check the wire from the PCM to coil #3 for continuity (so PCM connector C1 pin 1 to coil rail connector pin 4. Use a bend open paperclip or alike to not spread connector female side) . You could also check the primary coil circuit resistance and compare it with the two other coils.
Attached Files
File Type: pdf 1999 coil rail.pdf (172.4 KB, 0 views)
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  #23  
Old 09-20-2013, 12:02 AM
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Quote:
Originally Posted by Frango100 View Post
Here you go. Check the wire from the PCM to coil #3 for continuity (so PCM connector C1 pin 1 to coil rail connector pin 4. Use a bend open paperclip or alike to not spread connector female side) . You could also check the primary coil circuit resistance and compare it with the two other coils.
Thanks for the info.
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