Thread: P1391 stumped
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Old December 6th, 2017, 12:13
wes3337684 wes3337684 is offline
NAXJA Forum User
Join Date: Dec 2017
Location: KY
Posts: 5
P1391 stumped

Hi everyone long time looker first time poster, I have a 98xj 4.0 Auto, its got 283k on it with only minor issues like freeze plug leaking into bell housing . Now I have the p1391 code, put in new Mopar crank sensor still have code, put in new Mopar cam/ pick up sensor coil, still has code. Checked wiring to o2 sensor ect. and all grounds. Put #1 at TDC with harmonic balancer on TDC and pin fits like a glove into slot in distributor with no play in shaft. What am I missing? SES light comes on as soon as i start it twice, but runs fine. I can unplug crank sensor with jeep running and it kills the engine, unplug cam sensor engine stays running.
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