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Thanks. Forgot to mention, it has a new FPR. I'll try another one but I'm thinking it's deeper than that. Or I have a poor understanding of how the regulator works, haha.

Also just wanted to throw it out there, it's a one owner, never been off-road, and has been meticulously cared for. I have a 3" binder full of service records going back to the purchase invoice. No chance of "abuse" or anything that could be causing this other than a parts failure that I'm not...

Hey gents. 1992 XJ 4.0 with an interesting and long one for you. I have done research on all forums, etc until my eyes bled and I can't figure it out. Any ideas would be much appreciated. TL;DR - Jeep stinks and won't smog, abnormally high fuel pressure for a 92, lots of replaced parts...

*Solved* It was the distributor off by a tooth, as Diesel stated. Thanks guys! I should've gone with my gut and checked it before I threw $400 worth of parts at it. Oh well.

Cool thanks Mud, I'm doing the timing as we speak and if that doesn't fix it, I'll look to the o2's. Which one would be the better of the two to start with? Don't want to buy both if I don't have to ya know?

I'll give that a shot, thanks Diesel. Anyone else able to comment on that or further?

Hey guys, I understand that this issue is constantly beaten to death but I'm at my wits end and need some help. I have a 1997 XJ with 212k on chassis and 98k on the replacement 4.0 (done by P.O) that's having some issues which I've researched the hell out of and repaired most of them, to no...