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Old 05-18-2011, 11:10 AM   #1
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Help !! Crankshaft position sensor, vs flywheel

Just finished installing a rebuilt 2.5 , 4cyl in my 89 Jeep wrangler. Runs but is idling rough. Cylinder 4 is the only one where the plug is clean after running for only a minute or so,,, #2 is soaking wet and #1 and #3 have carbon build up on only one side.
I am really trying to find out if anyone knows where the timing mark, on the flywheel is supposed to be when I am at TDC on cylinder #1. Should it be on the crankshaft position sensor, or is it there at the beginning of the compression stroke. The flywheel will only go on one way the best I can tell, A little worried that the new crank shaft was machined wrong.

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Old 05-18-2011, 02:46 PM   #2
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I'm guessing with your other post you got it running good now...

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Old 05-18-2011, 02:55 PM   #3
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No, I am at a loss, about to pull the trannie so I can get to the flywheel and try to figure out why my timing marks on the flywheel aren't lining up with the crank pos sensor
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Old 05-18-2011, 03:00 PM   #4
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Timing marks should be on the crank and cam gear under timing cover on front of engine, are you sure they are lined up correct ? From what I've read they can be a pain to get correct!
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Old 05-18-2011, 03:00 PM   #5
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Who installed the dizzy? If you went by the service manual your prolly too advanced.
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Old 05-18-2011, 03:08 PM   #6
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With a timing light it is too advanced at idle, however the timing is not adjustable, is controlled by the control module and the computer, from what I understand. Shouldn't the gaps in the teeth on the fly wheel line up with the crank pos sensor at tdc on one or the beginning of the compression stroke on one?? Isn't that how the electronics know how to advance or retard?? If it should line up... it doesn't.
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Old 05-18-2011, 03:13 PM   #7
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But....if you put the dizzy in advanced from the getgo it cant retard it enough. Try moving your plug wires back one position and see how it runs. If it straightens out, then you know the dizzy is one tooth too advanced.
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Old 05-18-2011, 03:16 PM   #8
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Nice , I am going to go try it.

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