redneck_rollercoaster

sorry guys I've been busy, anyway I changed the oil and ran motor flush thru the engine. and my oil pressure went up. to 30 pounds at idle and 45 to 50 running! . but I'm still haveing problems with it running poorly, you know... still spits, sputters and cuts out? ONLY if I run it right after start up. If I let it warm up for about ten to fifteen minutes it runs fine? but if I run it all over, shut it off for even a minute and try to go again it acts up? :headpop: . oh and the strangest thing happened the other day, on the way home from work at a stop light it started to idle high and it continued to idle high all the way home. so when I got home I shut it off and started it right back up and it idled really high for about two or three minutes and then idled fine? but it only did it that one time? :cry: someday I'll figure out what the deal is.

I have a 4.0 with a straight pipe and a stock cat. it sounds good. also it didn't really affect my milage at least not that I noticed? I have stock pipe from the header back and run 2.5" from the cat back. :cheers:

thanks Pete, I guess I don't have to crank for a long period of time really? it just seems that I have to crank longer than I should have to for a fuel injected engine. I mean my 02 silverado fires right up where as my favorite MJ has to crank for a short time. I don't know? I'm probably making a big deal out of some thing very small. :nuts: :D Oh I have another question, my MJ is a pioneer model and it doesn't have a tach but I would like to put one in so I was wondering if I get a guage cluster out of a 87 to 90 XJ or MJ lareado would it be fairly simple to put it in my truck? (as far as a direct bolt in with the wiring harness working correctly) and if so would the smaller fuel guage work properly? Thanks again, you guys have been a HUGE help! Derek. Also Pete what brand would you suggest for an oil filter?

once again I let it warm up and it runs fine? anyway thanks Pete, I am going to run a system cleaner thru the engine and change to a different oil filter. aemsee I'm not sure if the dealer tested that so I called them and they said they tested so much stuff on it there not sure if they tested that or not? sounds kind of funny to me but whatever. when I run the motor flush thru it and change the filter I will let you guys know how it turns out. also I think that I may change the CPS to. for some reason I think that it's just not working properly?

Hey aemsee, good to here from you again. and yea it's the strangest thing once it's warm it runs fine... a little doggy (like it's tired) but fine. well running temp for my MJ seems to be about 175 to 185 farenhieght and the radiator seems to be fine theres no leaks, I'm not losing any coolant and the fins look clean, oddly enough the only time it got hot which according to you Pete isnt hot at all (and I was not aware of the normal running temps so thank you) was at the dealer when they held the rpms at about 1200 for roughly ten minutes the temp went up to about 215 farenhieght. and yes I am running a fram filter on the oil and air. oh also it runs a good ol' fashion clutch fan. my oil grade is 10-30 valvoline. I'm with you mjeff, I think that was just a stab from the dealer because they don't know whats wrong and they even said there not sure what the deal is.and I was under the impression that if you have a valve problem like floating or dropped, the engine would make sounds almost all of the time and mine just makes a lifter tick sound sometimes? One thing I am concerned about outside of the obvious is my oil pressure over all. when it's cold outside, at initial start up my oil pressure is about 40 pounds but after warm up at idle its 10 pounds and running down the road it's only about 25 pounds? Thanks again guys. :cheers:

here's a new development I have just encountered, in the course of the last day ( and mabye it's just a fluke ) every time I let my MJ warm up to running temp, about ten to fifteen minutes it runs fine? Man I'm confused. :headpop:

the rocky road outfitters are based just about 200 miles south of where I live, in Heber City UT, I have toured there facility. the lift that you are speaking about if I'm correct is the 5" SOA lift and the components are of high quality. I saw there MJ in action last year down in moab ut well at least I think it was there's if not it sure was a rolling billboard for RRO, I do know for a fact that it had the 5" RRO soa lift and it seemed to hold together nicely! however I also am not sure what they are doing for lower control arms, I need to find out. at any rate I would like to run the lift as soon as I can afford it. I know that they were getting about 28 to 30 inches of flex out of there's. here is the address for there site. ( www.rocky-road.com/comanche.html ) :cheers:

ok guys I've got bad news and even more bad news, My MJ just spent the last two days at the dealership and while they were running a battery of test which involved testing all electrical sensors, ohm test on the wiring harness, cps test, and ecm test. all of which passed with flying colors. However while running the tests my MJ started to heat up (not redline) but it got hot and the oil pressure dropped to less than ten pounds! and while the heart attack started to comence the top end started to chatter not bad but like a heavy lifter tick. and the only thing that the dealer could think of is that I have floating valves. so all and all it's time for an overhaul. the reasons that they came to this is the obvious sounds but also they said that while the truck is rev'd to about 1200 rmps and held there it starts to cut out every 18sec's, revs and then runs smooth. if this doesn't sound accurate to any one please let me know. Thanks again guys. Derek :cry:

aemsee I will definently try the things that you have posted and let you guys know how it turns out. once again I GREATLY THANK all of you!!! your insight has been a god send. Derek

ok first of all please understand that the little guy dosen't die it just spits and sputters, cuts out while it's idleing or driving, and if it starts to act up while at a stop light for instance it starts to idle very rough for a few seconds and then revs for just a moment ( like it would at start up) and proceeds to run smooth. there is no smoke, the compression is good across the board, and if you read my first entry you will see what I have replaced which is more than the fuel pump and filter. there seems to be no rhime or reason to the problem I've tried to figure out if there are certain times when it does this. at start up, braking, turning, shifting, lugging the engine, warm or cold outside, racing the engine thru the gears,ect... the one thing that I can say however is if I let it warm up until its at running temp and then drive it, sometimes it doesn't do it at all but if I run all over town like this, shut it off and restart it after only a couple of minutes it starts doing it again! and sometimes when I start it in the morning after sitting all night it does cough and stutter like its missing ever so slightly and when it warms up there seems to be no miss? but the timing index it accurate according the the dealer. urgh... Oh I checked the C101 connector and it seems fine, I unpluged the plugs and checked for corosion and loose wires spayed some W-D on it and pluged them back in. also my stealership, which is well established said that the MAP sensor is good. but I will definently ask about the crank sensor. because the third shop I took it to for this problem YES THE THIRD!!! said at a certain point in the rpm's I was loosing spark, thus all the electricial components I replaced. Also I can't agree more with finding a compatent mechanic and there is one in this area his name is rick nakyha and he owns rick's off road center here in Idaho Falls and I highly recommend him if any of you are in the area he is outstanding! a true jeep guru. Now with that said he is out of town for a few months on family buisness so I'm told, and this bieng my daily commuter I just can't wait that long. as I'm sure most of you can relate. plus it's hunting season so I need my little guy. Thanks for everything guys I really do appriciate it and please leave more input. I promise I will let you know what fixes it when I find out. Sincerly, Derek Austin :cheers:

I don't think I have a pinched fuel line, when I replaced the pump and filter I checked my lines for leaks and any thing else that looked abnormal. all I know is that I'm frusturated, I really love this little truck and it's starting to cost me a lot of money. which is very upseting do to the fact that these outfits are usally known for there reliability, and the fact that even my local jeep stealership can't tell me what the problem is. Oh well I guess I'll just keep trying until I find the problem. thanks for the input. :cheers:

thanks guys for the input. I'll give it a try and I'll let you know how it turns out. 8)

I have an 87 MJ long bed with the 4.0, 5 speed and it is a 4x4 with 128,000 miles on it. oh pic coming soon. any way here is the problem, when I puchased this MJ it was cuting out while driving like it was a fuel problem so I replaced the fuel pump, filter and pressure regulator to no avail. and I had the injectors checked they were good. so I replaced the plugs, wires, cap, rotor, distributor, coil, ignition module, and oxygen sensor. still didnt work so I replaced the entire eghaust system and that didnt work. if anyone knows what may be causing this PLEASE HELP! :mad: