Code P1391 - JeepForum.com

 
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post #1 of 11 Old 08-05-2010, 08:57 AM Thread Starter
barcand
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1997 TJ Wrangler 
 
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Code P1391

My 97 Wrangler Sport has a check engine code of P1391. I have replaced the Crankshaft positioning sensor and that did NOT correct the issue. I am at a loss of what to do next. When google p1391, it seems that this code is always tough to troubleshoot. Your ideas and thoughts are much appreciated.


1997 Jeep Wrangler Sport
4.0 Straight 6
5 Speed Manual
205 k

Thanks

Brian

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post #2 of 11 Old 08-05-2010, 09:20 AM
oakmckinley
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In my manual it says "Intermittent loss of either Camshaft or Crankshaft position sensor".
Just so you know I replaced a Crank position sensor once and the sensor itself was defective, I guess they have a history of being crappy.

1999 TJ
2000 XJ Cherokee
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post #3 of 11 Old 08-05-2010, 09:23 AM
Sundowner
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That code is listed as "intermittent loss" of either the Crankshaft Positioning Sensor, or the Camshaft Positioning Sensor. Keywords: intermittent and loss. So, at times, it's working...

Thus, your first check should be wiring and connections.

In fact, that's your first step every time...wires, connectors, fuses, relays, etc. Simple stuff first. By not doing so, you've replaced a working, functional sensor. (Not that I'm getting on your case...that was more for people reading this in the future.)

So, check that stuff first, and then check the cam sensor. They can both trip that code.

If it's worth doing, then it's worth overdoing.

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post #4 of 11 Old 08-10-2010, 06:39 AM Thread Starter
barcand
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I am on my 2nd crank sensor and the light is still on p1391

I checked all of the connections and they seem fine. Is it worth trying the camshaft postioning sensor?
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post #5 of 11 Old 08-10-2010, 06:45 AM Thread Starter
barcand
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I just noticed that my Jeep 97 sport 6 cyl doesnt have a camshaft positioning sensor..
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post #6 of 11 Old 08-10-2010, 06:47 AM Thread Starter
barcand
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When advanced autoparts put it on their scanner, it came up with p1391 then when he scrolled through it stated a misfire on all six cylinders. It was already tune-up about 20k ago.
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post #7 of 11 Old 08-10-2010, 05:20 PM
Knuckelhead
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Quote:
Originally Posted by barcand View Post
I just noticed that my Jeep 97 sport 6 cyl doesnt have a camshaft positioning sensor..
Did you look in the distributor?...
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post #8 of 11 Old 08-11-2010, 06:15 AM Thread Starter
barcand
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What should I look for?
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post #9 of 11 Old 08-11-2010, 06:56 AM
ManInBlackTJ
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my brother has a 96 xj that had pretty much the same problem. I took his distributor cap off and found the bushings were shot in the distributor, I could grab the rotor and move it about half an inch side to side (over 190kon the engine). We replaced the dizzy and no more problems!
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post #10 of 11 Old 08-11-2010, 06:58 AM Thread Starter
barcand
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Ok, because I am not experiancing any misfires, it is just what the code is throwing...
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post #11 of 11 Old 08-19-2010, 09:37 AM Thread Starter
barcand
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I have resolved this by putting in a new distributor... thanks to all..
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