4.0 GC Quits running - JeepForum.com

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post #1 of 8 Old 12-06-2006, 02:50 PM Thread Starter
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4.0 GC Quits running

My 1999 GC Laredo quits running (turns off). It was just a idle but now it happens when going 45-50 mph. The code that is set is P320. After it quits you can crank the engine and it just cranks and nother happens. Seems that turning the key off then back on then cranking will allow it to start. This restart only takes a 5 secs or so. Not sure if the key off thing is a clue or not. Code says crank sensor not seen during cranking. I have checked the cable and ground. Seem good. I am thinking about swapping the crank sensor out. Fuel pressure is good.
So can these crank sensors fail intermittent and if it did should I get some other codes? This is the only one that I get. Also I have reset the codes and when it quits the P320 reappears. Any ideas out there?

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post #2 of 8 Old 12-06-2006, 02:54 PM
Mr. Hyde!
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Replace the CPS and go from there.

'04 WJ, 6" Clayton LA's, 242 SYE, 35" BFG MT KM2's, 4.56 gears, & D44a locked
'14 WK2 Limited w/5.7L, ORAI, & Tow Package
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post #3 of 8 Old 12-06-2006, 03:02 PM
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yea.. the codes that come up, come up for a reason usually, unless you completely submerge your jeep in water during a river crossing, and everything starts coming up till it all dries out

Safari'd out ZJ.
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post #4 of 8 Old 10-21-2014, 06:31 AM
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Did you ever get this problem figured out? My 2002 jeep wrangler is doing what sounds like the exact same thing. What did you find?
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post #5 of 8 Old 10-21-2014, 03:34 PM
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1994 ZJ 
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First thing is to scan for codes...and try to clear them! The engine computer self diagnoses. Then repost for advice....

Proud owner of two 4.0 Laredos
Red 94 mint!
Silver 98 w/283k runs like new!
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post #6 of 8 Old 10-21-2014, 11:49 PM
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Use Mopar sensors, others may work but can give a lot of troubles.
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post #7 of 8 Old 10-23-2014, 08:21 PM
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It's not showing any codes ... Except when I turned the key off and on three times, it showed p0320. Is that for the crank sensor?
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post #8 of 8 Old 10-23-2014, 08:40 PM
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1996 ZJ 
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P0320 Ignition/Distributor Engine Speed Input Circuit Malfunction

Possibly the crank sensor or cam angle sensor in the distributor.

I'd replace the crank angle with a new Mopar part and go from there.
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