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1993 grand Cherokee dying and not starting - coil?


 
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terryh80
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Joined: 13 Jan 2008
Location: Kansas

PostPosted: Mon Jun 02, 2008 4:18 pm    Post subject: 1993 grand Cherokee dying and not starting - coil? Reply with quote

We bought a 93 Grand Cherokee with 5.2 that wasn't running. Checked a few things and replaced the coil and ran great for 8 months. Died while driving and wouldn't start. My son got anxious and installed a new coil and it did the same thing 17 miles later. I checked the plug wires and found two that ohmed bad. Replaced them and it ran for awhile and died again. Tried to measure voltage to coil and had one wire that alternated between ground and 12 volts and the other went from 0 to 6 volts. Whats the wires going to the coil supposed to read? I don't want to throw parts at it. We're waiting for it to cool down right now so we can drive it home from the store. Any ideas? Would the shut down relay do this?
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sjhill81
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Joined: 03 Jun 2008
Location: Springfield, MO

PostPosted: Tue Jun 03, 2008 11:04 am    Post subject: Reply with quote

i have a similar prob on my 93 zj. i'd be driving and it would die any where from 30 to 70 mph. i'm in the middle of changing the plugs and wires now, the shop said i had bad wires and they were arcing to the block ruining my coil. they put 2 new coils on it before they realized the cause. i busted the emissions elbow on the top of the valve cover so i haven't been able to test it yet.
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swamp boy
Cherokee Muderator
Cherokee Muderator


Joined: 01 Jan 2004
Location: New Orleans LA.

PostPosted: Tue Jun 03, 2008 9:17 pm    Post subject: Reply with quote

I had a simular problem .. My coil wire was grounding out on the valve cover..

Might want to check yours.. It will not ohm bad unless it is grounded while your are checking..

did you change all the wires or just the 2 that where bad???

It wont hurt to change them all..

Lots of things will cut coil power .. Bad CPS .. I think if the fuel pump is bad the computer wont switch coil on.. but thats prolly the shutdown relay..

But none the less I would start with the plug wires.

then trace the coil power input wires to make sure they are not shorted somewhere..
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EYESIC
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Joined: 21 Sep 2007
Location: ARIZONA

PostPosted: Fri Jul 18, 2008 9:32 am    Post subject: Crank shaft positioning sensor? Reply with quote

Hehe sorry to post this tiwice but it also sounds like the crank shaft sensor.
my 93 zj did this to me i would work then it would die i also changed the coil but what really did it was the CSPS
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