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Old 03-22-2015, 09:04 PM
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97 4.0 manual won't start after engine swap p0320

Hi,

My old engine had a broken piston skirt. So I picked up a used engine. We finished putting it in and it won't start. I am getting a p0320. When installing the replacement engine We loosened the bolts holding the CPS and moved it out of the way to keep it from being damaged. It did get crushed a little when we raised the transmission to meet the engine upon installation. I understand it may be the CPS. However, I cannot figure out when I am at compression TDC when I put the distributor in. Wouldn't I get a P0320 for the distributor being 180 degrees out of time? I have removed the distributor and reinstalled it when the notch has lined up with "0" on the timing mark twice. I got the same P0320 error after removing the distributor and turning the crankshaft 360 degrees. I thought maybe I installed the distributor at TDC on the exhaust stroke originally. The jeep actually ran real well before I pulled the old engine-just noisy. I get no spark now. Any ideas?

Thanks, Ron

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Old 03-24-2015, 04:19 AM
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I just plugged in my code reader and I do not get any RPM readings while trying to start the jeep. Is that a further indication that the problem is a CKP sensor? I would think if the computer does not see an RPM it would mean it is not seeing the engine turn to give ignition.

Help?

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Old 03-24-2015, 06:17 AM   #3
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Correct regarding crank position sensor. Check working and connections before condemning sensor just to be sure that isn't where the problem lies
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Old 03-24-2015, 08:21 PM
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Found cut wire at the sensor. Looks like it was damaged by pinching it between the body and bell housing. i reset the timing and it starts and runs well.

Thanks for your help AU
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Old 03-24-2015, 08:34 PM   #5
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Excellent and basically a free repair. Thanks for following back up
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