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Old 12-08-2008, 05:24 PM
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Jeep Cherokee won't start

Hey fellas, I have a Jeep problem and I believe it to be a simple, PITA electrical problem; 1994 Cherokee 4.0L L-6, approx 120k on the clock, bone stock. All was well until this happened; Engine has intermittent misfire causing a no start. Seems as if the spark is totally random causing pre-ignition during cranking- it sounds like it's sparking at the wrong time. I?ve checked the spark directly from the coil wire, which is NOT a consistent spark after spark. It's a totally random spark. The engine is other wise healthy and HAS started and ran as smoothly as before a few times, but then soon dies and fails to restart. Right now it will crank but not start.

Thing I've checked and/ or replaced so far:
Crank TDC sensor- it checked out 'good' electrically as per motor manual instructions. (Resistance check)
Fuel- good pressure, good gas.
Distributor pick up, coil, cap, plugs, wires.
Battery is grounded to engine with the normal battery cable and ground strap to body- connections clean and tight.
Engine is grounded to body at firewall. Have checked to assure good clean connection.

Any ideas? (thanks for reading all that)

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Old 12-08-2008, 08:55 PM
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crankshaft position sensor has failed... On chrysler products, the primary ignition circuit will not pulse until it has a CKP signal, and this faliure is very common on Jeeps.... the correct way to test the CKP sensor would be an oscilliscope as it is a hall effect sensor, and a resistance test really tells nothing...
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Old 12-11-2008, 06:24 PM
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You were correcto-mundo, sir. Thank you for that.

So I removed the CPS and noticed the business end was nice and shiny, with metal shavings on it. Hmmm. It's a non-adjustable bracket, hmmm. The reluctor wheel on the flexplate isn't loose. Now what the heck is going on here....

Oh, I see, the engine and trans is almost ready to part company. Only ONE more bolt (and it was loose also) and the guy woulda ran over his own trans. The sensor was being machined away by the signal wheel. Neat!

I'm glad it's not my J(H)eep.
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Old 12-16-2008, 09:45 PM
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Well let me just say that the Heep, oh sorry, Jeep is running is running flawlessly.
I can't thank C-10 enough for fixing it for me.

It does have some other issues that will need sorted out but it is drivable and I will get to it after frying up the bigger fish so to speak.
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Old 12-16-2008, 10:34 PM
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Quote:
Originally Posted by vwhammer
It does have some other issues....
Issues like a loose nut behind the wheel.

Oh and, you're welcome.
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Old 12-21-2008, 11:39 AM
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Well crap!
Now my brakes are fubar.

I can fix it but I don't want to.

Hey C-10 you think if I pull it into your place with the brakes on fire you can fix them for me.

No. I'm just kidding.
I will be fixing it tomorrow in the garage at work.
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