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Old 03-02-2010, 10:08 PM
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Exclamation p1391 code

ok, 01 wj Limited. 147000 miles 4.7 liter the #1, #3, and #8 rod bearings spun. so, i bought a new 4.7l long block and put it in. all new everything.
hit the key for the first time and it spins but will not start! that felling suck by the way! so i got inot the book and tried everything! it has correct fuel pressure, it has fire, then i gave me the p1391 code. intermentent signal from the crank or cam position sensors. i checked and re checked everything grounds, and the replaced both sensors. still nothing! the mechanics have no clue and im lost at this point. so anybody got anything for me?
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Old 03-02-2010, 10:13 PM
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Re: p1391 code

its the cam sensor
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Old 03-02-2010, 10:13 PM
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Re: p1391 code

cam or the crank for sure
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Old 03-03-2010, 12:34 AM
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Re: p1391 code

look at this
http://wjjeeps.com/tsb/tsb_wj_082200a.pdf

CMP SENSOR OUT OF SYNC
DAMAGED TONE WHEEL/FLEX PLATE (CRANKSHAFT)
DAMAGED TONE WHEEL/PULSE RING (CAMSHAFT)
IRREGULAR LAB SCOPE PATTERN OF CMP SIGNAL
WIRING HARNESS INTERMITTENT
INTERMITTENT CKP SIGNAL LOSS WHEN WIRING IS WIGGLED
IRREGULAR LAB SCOPE PATTERN OF CKP SIGNAL
INTERMITTENT CMP SIGNAL LOSS WHEN WIRING IS WIGGLED
SENSOR CONNECTOR/WIRING
CAMSHAFT POSITION SENSOR
CRANKSHAFT POSITION SENSOR
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