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Unread 10-29-2009, 01:36 AM   #1
xKingSizex
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93 5.2L is a coil killer

Okay, so I have a 93 5.2L limited Grand Cherokee. The jeep has been killing coils every two to three weeks for the past few months. Last Monday, it wouldn't start at all even after putting in a new coil (the usual fix). I had it towed to the shop that has been trying to figure out why it is killing the coil (I've had it in 3 shops now, with no luck), and it started for the shop after it got towed there. I picked up the car, drove it home, and it hasn't started again since.*
I was told by a service manager at Jeep to try switching out the crankshaft position sensor, as this was a common problem on this year jeep, which is a 93 limited 5.2L V8.*
I bought the part, but can't find where it goes. According to my repair manual, it is in one of two places. Either on the back side of the block or on the top of the bellhousing of the transmission (which I can't see).*
I've noticed that some of you have switched yours out, but only found one diagram...which was no help. If anyone can think of the possible fix on this one, let me know.

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Unread 10-29-2009, 05:09 AM   #2
Kramer H
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before you start throwing parts at it, have you checked resistance in the circuit? maybe you have excessice resistance which is killing your coils?
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Unread 10-29-2009, 11:46 AM   #3
xKingSizex
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The shop that I had it in told me that they checked all of that and found a couple of shorts in the wiring, which they fixed. Everything else checked out fine, according to them. I also sourced a new connector that goes into the bottom of the coil and switched out the old one because the clip was broken on the old connector.
I've replaced the plugs, wires, cap and rotor, MAP sensor and idle sensor so far. I'm not even as bothered right now about the coils burning out as I am about my car not starting at this time. It's my only vehicle and I need it running.
Thanks for the reply.
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Unread 10-29-2009, 12:47 PM   #4
LordHobbit
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I go through a couple coils a year. I've determined it is heat that kills it. So I relocated. http://www.jeepforum.com/forum/f13/4...cation-873973/

However, if you aren't driving great distances and the coils are dying, I'm not sure what would be the cause.
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Unread 10-29-2009, 01:48 PM   #5
xKingSizex
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Heat may be a factor, but they aren't lasting longer than a month at the most. I had two of them only last a couple of days. I have planned on moving mine as well, but there is definitely something else going on.
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Unread 10-29-2009, 02:10 PM   #6
LordHobbit
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I bought one from NAPA that lasted 8 miles.
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Unread 10-29-2009, 05:44 PM   #7
Kramer H
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i would find specs (what the voltage/resistance) should be before the coil and see if its in spec. thats where i would start.
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Swapped, SUPERCHARGED Locked, Lifted and Long Armed.
02 Cummins. It has a smoking problem, And it wont quit.
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Unread 10-29-2009, 06:53 PM   #8
ratmonkey
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the cps is next to the pass side head, a little towards the distributor. you need tiny hands to get to it.
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Unread 10-29-2009, 07:10 PM   #9
xKingSizex
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Great to know, thank you. I have the repair manual and it just wasn't specific. I also don't have tiny hands, I have fat sausage fingers...I'll see what I can do though.
I was trying to look and feel around there last night and found that the egm vacuum transducer was apparently not connected to the tube it was supposed to go to, plus it was apparently laying on the rear of the passenger side head and got melted on top and bottom, which created holes in the part. I plan on replacing the part, but was wondering if this could be causing any issues in the vacuum system?
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Unread 11-05-2009, 12:51 PM   #10
xKingSizex
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So the non starting issue was due to a bad fuel pump, even though the shop two weeks ago said it was fine. I don't think they checked it at all.
Now just hoping that the coil issue doesn't come back up, it has lasted for a month so far without dying when most only lasted two to three weeks.
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