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Unread 04-11-2010, 07:09 PM   #1
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Join Date: Apr 2010
Location: west virginia
Posts: 3
just dont know

my brother has a 93 yj with a 4 cylinder straight drive.we went muddin one day and he was pretty tough on the motor,on the way home it started missing real bad.when you start it up it idles fine.as you start down the road it does decent for about a hundred feet or so then it starts missing terribly and a little backfiring,almost like it was out of time.the timing is right,and we already replaced the plugs,wires,cap,button,coil,converter,and throttle positioning sensor.we found that the wires on the crank sensor were a little burnt,we tried a sensor off a 4.0 with no luck.is their a difference in ohm readings between a 4 and 6 cylinder.could this be the problem or something else.he is getting fed up and im running out of ideas.someone please help!

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Unread 04-11-2010, 07:43 PM   #2
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1989 YJ Wrangler 
Join Date: Jan 2009
Location: mi
Posts: 4,160
You can not read ohms on a hall effect sensor. Now you can see the pulses if you read between the +voltage and sensor out.Unless you have a scope you will not be able to see the pulses them self but you will see a small a DC voltage it should be about 2-4 volts when cranking or running. Now if you do not have this voltage. then I would suspect a bad kps.
A 89 yj with a 4.0 aw4 sye out of an 92xj. Now the hard part is done time to get it up in the air just a bit. Working on 8.8 with 3.73 and lsd for the rear. and new D30 hp with 3.73 .
For those who have not figured this out I'm old school but can handle the new too.
Originally Posted by bigsquat View Post
im just cheap, and cheap makes you creative.
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Unread 04-11-2010, 08:00 PM   #3
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1993 YJ Wrangler 
Join Date: Aug 2008
Location: Raleigh, NC
Posts: 10,256
Did the exhaust get submerged? Might have gunk in the cat and or muffler.

I have a jeep...and it is modified...I win.

YJOTM July 2012
YJOTM February 2014

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Unread 04-11-2010, 09:24 PM   #4
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1995 YJ Wrangler 
Join Date: Dec 2008
Location: Greenwood, Arkansas
Posts: 1,536
Sounds like mine and I have been hunting this problem for almost a year now. Check out this thread of despair!! Good Luck, I hope you have better luck then I have so far.

(Hank is Yellow Lab) He loves it!!
95yj 4.0L, 4" RC Lift, 8.8, Aussie Locker, Posi-Lok, Rock Sliders, 1" Booms, 33 X 12.50's, Rhino Lining, KC Day Lighters, Rock Bumpers, LED Dash Lights, XRC10 Winch
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