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Sept 20, 2006 20:22:26 GMT -3
Post by Jay on Sept 20, 2006 20:22:26 GMT -3
I'm getting kinda stumped at what the hell is wrong with my jeep. i'm havin engine problems out the a** (electrical) if anyone is willing to help me out I can trade labor (do ur lawn, help u move etc). i can do brakes, or any other kind of labor in exchange. I haven't really dug into engine work yet so any helpin learning wud be great.
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Sept 20, 2006 22:05:46 GMT -3
Post by jeepgod on Sept 20, 2006 22:05:46 GMT -3
what exactly is it doing?
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Sept 21, 2006 1:24:54 GMT -3
Post by Jay on Sept 21, 2006 1:24:54 GMT -3
it sputters and runs rough from time to time. conditions dont seam to affect when it does it (heat, movement, running time) it also seams to be runnin very rich (when sputterin or not) because the exhaust is very strong. i had changed the distibutor, cap, and wires. it didnt fix it, so i ran some injector cleaner and it didnt help. so then i changed the plugs and they didntlook to good. but it still didnt fix the problem, so i picked up carb cleaner and took off the intake on the throttle body and discovered black build up. seams to be oil comin out of the vent on the headdown into the air filter and into the intake. i cleaned the censdr and the top the best i cud (was 2 am so i didnt want to pull off whole body, work in the am) it ran like crap that night after i cleaned it. but that test drive it still sputtered but later that mornin it ran so so to work and great later that day when i drove to a friends house and back. but next day it sputtered again. i have a few suspisions but i would like another opinion too (after someone looks at it). i think it could still be a coil issue (read an article on NAXJA that sounds very similar to my problem) or maybe my 02 sensor (it runs rich) or possible a fuel pump (which was wining a bit before this happened which i had wanted to change out) or it could just be bad injectors or something along thos lines but i really dont know where to start. i was goin to swap out the coil anyway (needed one from the junkyard cause the mount costs 150 and mine had shorted and melted before) after that i'm not really sure how to check senors or injectors. and my engine light isn't even on either (if it works at all anyway)
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Sept 21, 2006 8:41:32 GMT -3
Post by jerryhipp on Sept 21, 2006 8:41:32 GMT -3
if your getting oil in you air filter its blow by. which normally indicates bad compression or your vac lines are pinched/ broken somewhere. most likely compression. you could go to the dealer and get a vac line kit for $80. which consistes of three sets. to completely change out your vacuum lines. this might help. cause if your a 4.0 xj. you don't have a pvc. my 88 xj had the same problem with blow by. my compression was shot. i just junked the xj. once you get blow by your on borrowed time. throw some lucas in their. i had sputtering in my xj. i had to have all my injectors changed. could be your prob too. but i dont know. good luck though.
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Sept 26, 2006 23:17:08 GMT -3
Post by bluerocket on Sept 26, 2006 23:17:08 GMT -3
any update jay?
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Sept 27, 2006 12:03:14 GMT -3
Post by Jay on Sept 27, 2006 12:03:14 GMT -3
after i changed the coil again and cleaned the throttle body a bit it seams to be running ok. hasn't sputtered in weeks. (knock on wood) i'm thinking that the dirty censor may have been the problem but i also need to adress the vacum line issue (after jerry's post i want to at least find my leak and get as much out of this motor as i can) it still seams to run rich (still may just be a bad cat) but at least i can drive it normally. i'm going to see about maybe either checking the 02 censor or even just changin it and see if maybe this is just a side problem (seams like my jeep is full of side problems)
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Sept 27, 2006 12:27:20 GMT -3
Post by bluerocket on Sept 27, 2006 12:27:20 GMT -3
Correct me if I am wrong but I dont think the cat would be causing rich running conditions on a 90 cherokee. Dosent the 90 have 1 O2 sensor and it is upstream of the cat?
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Sept 27, 2006 12:57:59 GMT -3
Post by J.T.Woody on Sept 27, 2006 12:57:59 GMT -3
A clogged/ partially clogged cat. converter will cause a sputtering feel and the exhaust will smell very strange.
Jay, next time it is acting up, look under the Jeep (while running) and see if the cat. is glowing red. If it is, take it out. You can either splice in a piece of straight pipe, or hollow out the cat and put it back in. You'd be good until your next State Inspection.
Blow-by isn't the end of the world. Your motor may be getting tired, but it'll run like that for awhile. Just make sure to clean up the mess.
OH, and have you disconnected the battery after doing all of this work? I am not sure on the computer-controlled Jeeps, but if you disconnect the battery and step on the brake pedal for 30 seconds, you will drain the memory from the computer. Reconnect the battery, start it up, and take it for a drive. It will reset any engine codes you had/ have.
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Sept 27, 2006 13:25:37 GMT -3
Post by jps4jeep on Sept 27, 2006 13:25:37 GMT -3
Funny thing, I was reading a artcle today about something similar to this.. the problem might be the gas. Now with the addition of Ethanol to the gas, as the gas sits for some time in teh tanks at the station and the tank in your vehicle, the Ethanol and teh petroluem start to seperate, one of the by-products of this seperation is the bonding agent (can't recall the name) Basically it turns into a sludge and it causes Havok on older motors. Currently one seperated, (according to the article) there is no method to "rejoin" them. One thing that happens is that there is not lubrication.
This is similar to when the gov mandated that there be no more leaded gas, older engines that would run on leaded gas would use unleaded gas and the valve trains would suffer due to there being no lead to lubricate.
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Sept 27, 2006 13:36:20 GMT -3
Post by Jay on Sept 27, 2006 13:36:20 GMT -3
sorry i worded rich wrong. i mean the exhaust seams to burn the eyes a bit like it is running rich sometimes. (used to have the same feeling near my dads old diseal trucks) and i need to fix the exhaust soon or just go get another emision reject sticker. failed last time i went for emmisions. guy at the station suggested maybe a bad cat.
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Sept 27, 2006 21:47:04 GMT -3
Post by rain76king on Sept 27, 2006 21:47:04 GMT -3
The ethanol based gas is havoc on older marine motors also :-(
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