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Old 09-15-2013, 01:47 PM   #1
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97 wrangler won't start

My 97 wraglner won't start. It ran about 3 weeks ago,we had a bad storm alot of rain that weekend. It looks like I am not getting a spark,I checked for voltage on the coil ,green wire with black strip and a gray wire. No voltage. I traced the gray wire to the computer. I think the computer maybe bad. Dose and one have an ideals,anything else I can check? I want to make sure I am not missing something small.

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Old 09-15-2013, 01:55 PM   #2
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Ignition switch maybe. the computer wont power the coil unless the ignition switch tells it to. But could also be a crank position sensor.

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Old 09-15-2013, 02:17 PM   #3
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i just had that problem no spark or fuel presser so i replaced the ignition switch,the coil and still nothing it could be the crankshaft positioning sensor. if none of that works take it to a shop for diagnostic before you try any thing else. i did and they found a wire on the exhaust that was shorting out my fuse. i also have a 97
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Old 09-15-2013, 02:45 PM   #4
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Sounds like the issue I had with my '99... a new CPS put me back on the road.
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Old 09-15-2013, 04:38 PM   #5
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The engine's starter motor cranks the engine over at the usual speed but it just won't start?
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Old 09-30-2013, 09:06 PM   #6
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Hi,I don't know if you can help. I watched your ytube vid on crank shift sensor testing. Here is the whole story about my jeep. It is a 1997 jeep wraglner 2.5 5speed. I have had it for 10 years.
I droved it on a friday night on the way home it spuder,the first time it ever did that to me. It sat all hoilday week,friday night till tuesday am. In the morning it would not start just cranks over. That night I came home from work gave it a shot of starting spray,it popped over and has not even come close to starting again. I used to have to crank it over turn the key and then it would start but no luck this time. I have a Haynes manule but the wiring digrams are not that good in it. I replaced the crank shaft and cam sensors and it still will not start. I did find something odd I am not sure what it means but here is somemore info.

key off cranck sensor
pin #1 to pin #A8 000 ohms
pin #1 to pin #A4 open
pin #3 to pin #A4 .597 ohms

key off Cam sensor
pin #1 to pin #A4 .598 ohms
pin #2 to pin #A4 .108 ohms
pin #3 to pin #A4 open.

I don'tknow what wire on the CPU are for the Cam sensor,do you know?
Pin #3 to pin #A4 should be open,that is the 5 volt feed from the CPU rite?
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Old 09-30-2013, 09:20 PM   #7
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there is a fuse in the rear of the glove box. I think it is in center column 2rd or 3rd row. It is a 10 amp I think it is labeled primary coil.

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Old 09-30-2013, 09:20 PM   #8
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So it was cranking but now nothing? Pull your engine oil dipstick and see if the oil is over full and full of gas.
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Old 09-30-2013, 10:01 PM   #9
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I headed to bed so I will post again. If you have fuel in the oil I had the same problem a couple weeks ago. If no fuel in the oil still do this check. There is a small "fuel damper" at the from of the fuel rail. It has a vacuum hose going into it. Pull that vacuum hose off and turn the key on. If fuel shoots out that is your problem. It is the shiny piece in my pic at the from of the fuel rail. Hope this helps you out.
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