1990 cherokee 4.0L starting problem - JeepForum.com
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Unread 08-14-2009, 09:20 AM   #1
vintage_car
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Join Date: Aug 2007
Location: Nashvile
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1990 cherokee 4.0L starting problem

a few things have happened and no idea if any of this is related.

2 days ago, hard starting, that afternoon, it cranked but wouldn't fire. I sprayed some starter fluid in the throttle body and it fired up. Yesterday morning, it cranked but wouldn't fire. Starter fluid didn't help. Yesterday afternoon it did 2 things, cranked but would start, and then just a click no turning over. Waited a couple minutes and it would crank but not turn over.

I checked spark, there isn't any at the plug or the distributor.

Would a low battery allow for turning over but no spark? Not sure what to look at first.

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Unread 08-14-2009, 11:15 AM   #2
GeologistFelix
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1990 XJ Cherokee 
 
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Location: Vashon, WA
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My guess is that it's a bad coil or a bad crank position sensor. The starter fails as a result of low voltage before the coil/distributor, I believe. The clicking was probably your starter solenoid, though, which means the starter wasn't getting enough juice, so a low battery could be contributing to all of this.
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Unread 08-14-2009, 11:56 AM   #3
vintage_car
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replacing coil or CPS

how difficult is it to replace the coil and CPS?
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Unread 08-14-2009, 03:12 PM   #4
GeologistFelix
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Well, the CPS is a gigantic pain (note: I say that never having done it myself; just reading about it here on the forums), but the coil is pretty easy; you just have to move the wires and hoses out of your way and unbolt it, then put in the new one.

Probably good to disconnect the battery first, but that's all there really is to it, since it's right under the hood, not under anything large or difficult to move.
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Unread 08-14-2009, 08:07 PM   #5
vintage_car
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cps did it

It was the crank position sensor. You are right it is a pita! 7/16th socket worked on the bottom bolt, I had to bend a 7/16 wrench to get to the top one, along with jamming my arm between the firewall and rear of the engine. Fired up after I was done.
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Unread 08-15-2009, 01:37 PM   #6
vintage_car
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midfiring now

jeep ran great for about 20 miles and now it is shuttering with any sort of accelleration or even at idle. I'm assuming this shuttering feeling is misfiring. Would the CPS go bad that quick? I got this part from Auto Zone, has a 2 yr warranty. Can the CPS move at all and cause this problem?
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