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Okay guys. Did compression test today. Cold, dry. 1: 110 2: 110 3: 120 4: 115 5: 110 6: 121 Notes: Engine runs cool (new pump, radiator, thermostat) A recent emissions test showed high NOx Great fuel milage (18-19mpg highway) Plugs look great Has some piston slap on startup So... the...

Ah, that makes sense. Will check it out! If I recall, I just barely passed emissions on NOX last time as well. Maybe this video holds a clue. I've never heard a 4.0 sound like this on startup.

Not sure about mileage. It was a junkyard motor I swapped in. They said 90K if I recall, and I put on about 50K since then. It does have piston slap while cold. I just ordered a bore scope. Maybe I will check compression too. Why do you ask about compression/leakdown?

Good question. It does run cool. Goes up to 195, then tstat opens, and drops to about 170. I've tried dozens of different thermostats to no avail.

What da? Jeep is running like a champ. 17-18mpg. Spark plugs are beautiful. How is this thing making so much soot? I do have a new O2 sensor I guess I'll toss in.

What brand do you guys like for injection rated fuel hose? My buddy got some junk that rotted out within a few years...

Duuude that gasket is awesome, thanks for the tip!

Alright, I bought a Bosch fuel pump, and a 91'-'93 sending unit from ebay. Can't wait for the gasoline shower. https://www.ebay.com/itm/371268383987 robably should change my filter too...probably has never been changed...

ball joint nuts shoiuldn't be moving at all. That's a loose ball joint.

Wow thanks for the complete run down... Since installing the parts store sending unit years ago, my gauge has functioned strange. It moves in the correct direction but it does not accurately represent the amount of gas in the tank. For instance, I will fill up, gauge reads full. Drive 40...

Does anybody know which years the sending units were compatible with the 1991? I replaced my unit about 6 years ago with something from the parts store (which was supposed to be gtg) and due to different resistance in the design its been reading wrong ever since... Would kinda like to...

Can anyone confirm whether or not the stock bumper gets pushed out, leaving a gap? Or does the bumper remain in its normal position?

I did the standard whoosh-whoosh but wasn't even close. Measure the temp of your drums after a drive and see how close they are... Maybe you have some magic I dont :gee:

I did. It didn't do anything for myself.

Well as I understand it, this is just a thing that happens with XJ's. I put in an OME 2" lift about 6 years ago. There's a good 1/2–3/4" difference between L & R as it sits today. I was thinking about perhaps adding a spacer up front, but then I'd have no solution for the rear. What...

Recently replaced many of the wear items in my brake system. Afterwards, I went through the standard process for setting rear brakes, which isn't exactly super precise, and the trouble was the Jeep would dart left under heavy braking. To figure out what was going on, I took temperature...

Well that's cool. I didnt know about that thanks! @RCP I think it's the mag chloride they use in CO now. My blue XJ is completely white the day after a snow storm :(

Well I purchased the following: Walker Exhaust Quiet-Flow Stainless Steel 21357 https://www.amazon.com/dp/B000C918CS Northeastern Stainless Steel Tail Pipe Fits: 1996 - 1999 Jeep Cherokee https://www.ebay.com/itm/193310104081 They both appear to NOT be stainless as both are magnetic.

Yeah I don't mind cutting off the extra hanger. Hopefully identical other than that. I do already have a new aluminized one but I'd really like to not replace exhausts regularly... Maybe I'll give 'er a go.

Interesting. Do you guys know if a 96-99 tail pipe section will fit a '91? Looking at this guy: https://www.ebay.com/itm/193310104081