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Old 06-21-2013, 04:45 PM   #1
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Unhappy 97 Jeep Wrangler 4.0 Auto

I have a 1997 Jeep wrangler 4.0 Automatic. Just got it. When I drove it home it started to jerk and stall. Would run at idle. I got it home and read a lot on this forum and others and started to replace parts. I have replaced the crank shaft position sensor, cam shaft position sensor, distributor button, coil. Right now it turns over but no spark. I took off a plug wire to check but nothing. I need some help! How can I trouble shoot this before I replace everything! Need help fast.

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Old 06-21-2013, 04:47 PM   #2
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What about the plugs themselves?

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Old 06-21-2013, 04:49 PM   #3
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Is the fuel pump doing its normal short cycle on then off 1-2 seconds later when you turn the ignition switch to its 'On' (not Start) position? If your surroundings are quiet enough you should be able to hear the fuel pump inside the gas tank cycle on-off if you give it a second before turning the key to the Start position.
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Old 06-21-2013, 04:49 PM   #4
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There is no spark to the plugs.
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Old 06-21-2013, 04:53 PM   #5
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I pulled the tank and replaced the filter. The fuel pump works fine. Cuts on and works like it should.
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Old 06-21-2013, 05:18 PM   #6
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It's not the fuel. It's not getting spark. Is there a certain pattern of trouble shooting I should do.
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Old 06-21-2013, 05:20 PM   #7
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So no spark leaving the coil or no spark at the spark plugs? Have you checked the coil's output for spark before it gets to the distributor and then spark plugs?
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Old 06-21-2013, 05:20 PM   #8
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Codes showing are 12, 54,55.
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Old 06-21-2013, 05:23 PM   #9
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That helped, how is the electrical connection and cable leading to the camshaft position sensor located inside the distributor?
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Old 06-21-2013, 05:34 PM   #10
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There is voltage from the coil. When I hook up the tester to the wire coming from the coil it test for power when its turn over.
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Old 06-21-2013, 05:38 PM   #11
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I tested the wire coming from the distributor cap to the spark plugs and no spark. replaced the crank position sensor. still no spark.
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Old 06-21-2013, 05:40 PM   #12
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Ok but did you check the output of the coil itself for spark as asked above? Is the connector at the ignition coil receiving +12v?
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Old 06-21-2013, 07:03 PM   #13
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I am checking that in a few. I will reply in just a bit.
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Old 06-22-2013, 10:37 AM   #14
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Ok, I checked it over from the coil to the distributor( Have power there). No power from the distributor to the spark plugs, but spark from the coil to the distributor. I
Double checked the wires that come from the cam sensor in the distributor, which I replaced earlier. When I plug the new plug in it pushed one of the connection post back into the connector. That was why it was not sparking. There was no connection in the connector! Fires up! The reason for all this in the first place was after running it for a while the jeep will sputter and run at idle. So now I'm back to the first issue. I bought a crank shaft sensor and a O2 sensor. I hope this is the issue. But for now it fires up.
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Old 06-22-2013, 03:38 PM   #15
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I'm back. I changed the o2 sensor, crank shaft sensor, cam shaft sensor, coil, fuel filter in he tank, ( pump runs fine) and now it starts! The only thing is after about 20mins of driving it starts to spit and sputter. What do you think? I know there is a rear o2 sensor. Could that be it? Help! Codes showing 11, 12, 55

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