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My XJ 4.0 is having strange engine issues. Lately, at random times the engine is idling very high. Sometimes on start up she will go to 3000rpm and stay there. Occasionally it will calm itself down after a while and go back to hover around 700rpm (which has always been about normal). I have been...

I dunno if this has been talked about on here yet but, I am just about to do my oil change and I had to go all over around town to find enough of the Valvoline High Mileage 10w30 that I have used since I got the XJ (it always had valvoline before that) and in talking to a guy I know who works at...

Well my plastic sided 87 Rad has sprung a leak and if I have to replace the rad I may as well switch over to an open system one and get rid of the leaking pressure bottle. I have a pretty good link (has part #s ect) http://jeep.off-road.com/jeep/article/articleDetail.jsp?id=257864 I was just...

well today my 87 4.0 overheated on the way to work. It was idleing for a little while (in line for the drive through, what can I say) and it started to go up to the redzone. I pulled it over and the expansion tank was boiling over. Also I noticed some steam coming from the radiator (87 renix...

OK well my problem with the IAC is getting worse, I have tried cleaning the connection and replacing the latch relay. I think the old latch relay was good though because it was still starting the fuel pump. Unless I manually unplug and reseat the connection for the IAC, the engine will crank and...

well, I switched out my latch relay and I am still getting the same intermittant problem with my 87 4.0. Usually it will run great, but ocassionally, like it did this morning, the engine will just keep turning over and not catch until I pop the hood and unplug/replug the IAC. The IAC was...

first thing is my green 4wd warning light on my 87 with an NP231 just stopped working yesterday, it used to go on but not anymore it seems to me the jeep is still going into 4wd but there is a chance it may not be. I was wondering where the switch was that makes the indicator light up, might...

well my jeep won't start now in the "morning" unless I unplug the IAC. The engine cranks great, lots of power in the battery. The IAC was replaced about 2 months ago, made really sure not to touch the pintel. What I am wondering is, by unplugging the IAC, does that reset all of the computer's...

I'm probably going to be having a look at the TPS and maybe have the throttle cleaned but lately my 87 has been running like crap. It seems a bit under powerd and the exhaust pipe is jet black on the inside. Its not burning oil (no blue smoke and the Oil level is good) so I figure its running...

well for as long as I can remember I have had a in the engine that has been getting gradually worse, but not by very much. The other day while doing a tune up I decided to pull the valve cover (which had a leaking cork gasket anyways) and while it was off to listen to the rocker arms with a...

ok well this is going to sound really weird but, I think there is somthing going on inside my gas tank. every so often (and much more frequently when the tank is low) I can hear what sounds like bubbles that sounds like its gas tank. The only thing I can compare it to is its almost like the...

well right now its really hard to start (cranks for a really really long time), sometimes it won't start and I have to leave it sit for a little while (I don't want to flood it) and when it does start its after about a good 15 seconds of cranking. I won't crank it any longer because I don't want...

I'm really not sure whats doing this but my 87 Jeep is idleing like it has a mind of its own. Usually from a cold start on a warm day, it revs right up to around 1500-2000 rpms, this is on start up. At other times, usually after I have been driving it for a little while and a few other times...

just following up on an old post. I'm taking my 87 XJ in for a tranny flush, about 6months ago I dropped the pan and changed the filter and most of the fluid (other than the stuff in the torque converter) with ATF+3 (its what they gave me at the dealer). After hearing a little about how the AW4...

A while ago (probably 6 months ago now) I did a fluid and filter change on my AW4, got everything from the Chryco dealer. I remember hearing somthing about the AW4 not liking ATF+3 or not being designed to use it or somthing to this extent. Well I was in my garage today and I found what one of...

I just have a few questions about an enigne rebuild. I am thinking of rebuilding my 87 4.0 myself in a month or two because the lifters are getting pretty noisy. I was just wondering if there is any way for me to do a simple rebuild without having to involve a machine shop since the nearest shop...

well I think my engine is going to need a rebuild soon, it seems that I have a bad lifter (I have tried EOS and Lucas to no avail the tap comes and goes). THe problem is that the nearest machine shop is over 150 miles away and its going to be a PITA to get the engine transported to and back...

well I took my jeep in to a garage because of what was happening before (noisy lifters and low oil pressure) and it turns out that I have a bad sending unit so I wasn't getting the correct oil pressure at the gauge (I'm getting around 52 PSI instead of 22). Also as far as the noise goes I ran a...

So far its got worse and worse and when it started it was only when the motor was cold but, I have a really bad ticking noise coming from my engine. I wouldn't call it a knock, but its kind of a tick tick tick that goes a way for a few seconds and then comes back and is getting much more...

I am pretty sure I know what the problem is but I didn't think it would hurt to post it on here just to run it buy a few other ppl and get some oppinions. I just went out to start my 87 XJ 4.0 (it has the Mitsubishi starter motor that came on the Renix 4.0s, mine was rebuilt with a few peices...