Need some help

babyed · Aug 31, 2018

I just swapped a 4.0 out of a 98 xj into my 97. I swapped the throttle body, distributor, oil pressure sending unit, and coil off my 97 onto the 98 because the plugs didn't match on the 98.. Fired it up and its hard to start, idles rough, and it backfires terrible and will not rev past 2000 rpm...Im 100% sure the timing is right. I've checked it 3-4 X's now. I did notice today that I didn't hook the grounds that go on the dipstick tube back up. So I cleaned them and put back on... Still no difference. There is no check engine lights on, and I'm lost. Any help would be greatly appreciated.

Forbanger · Aug 31, 2018

Is there a difference between the 97/98 flywheel? Crank sensor issue?

Zjman · Aug 31, 2018

Sounds like you may need to get a adjustable cps and have you checked fuel pressure?

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Zjman · Aug 31, 2018

Sounds like you may need to get a adjustable cps and have you checked fuel pressure? Also try swapping pcm from donor Jeep

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babyed · Aug 31, 2018

I never even thought about the flywheel...... I haven't checked fuel pressure yet. Do they make an adjustable cps?

mdo817 · Sep 1, 2018

Did you have distributor out? 4.0 doesn't point at #1 @ TDC

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babyed · Sep 1, 2018

babyed · Sep 1, 2018

Here's the latest..... Swapped the ecu, and o2 sensor off my donor. No difference. Went back and checked the timing, it was set correct. So I advanced it 1 tooth just to experiment, and it ran better, but it was too much. Any ideas on what could be going on?

Zjman · Sep 1, 2018

Might be 180 out. Try this https://www.cherokeeforum.com/how-tos/a/jeep-cherokee-1984-2001-how-to-replace-distributor-398978

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babyed · Sep 2, 2018

Thank you very much!!! Your link solved my problem. My fsm does not match what you sent. Fsm shows the #1 plug being where the #4 plug is on the distributor cap. Your link was right, runs great... Thanks again zjman, I have fought this after work everyday for 3 days.. lol