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04-06-2007, 10:00 PM
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#1
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Registered User
Join Date: Apr 2007
Location: East Central Oklahoma
Posts: 75
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YJ buckin like a Mule & my saddle dont fit...HELP!
I seem to be misfiring on the next to last cylinder...1991 renagade 4.0L. Done all the usual things, plugs ,wires, cap,rotor. get a check engine light. Hooked it up to a scanner and got a " no vehicle speed sensor detected under load" But it will reset and I won't get it again until the buckin' starts. Any Ideas? I'm out of them. Thanks
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04-07-2007, 08:05 PM
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#2
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Registered User
Join Date: Apr 2007
Location: East Central Oklahoma
Posts: 75
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I spoke to a John @ morris 4x4 in Florida he said it could be the electricial conection at the injector and reccomended cleaning the contacts and adding dielectric grease to the connection. I will give this a try and let you know........................
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04-09-2007, 11:39 PM
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#3
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Registered User
Join Date: Apr 2007
Location: East Central Oklahoma
Posts: 75
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Didn't work but it was worth a try. Am I the only person on the face of the planet that has had this Problem???
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04-27-2007, 02:41 PM
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#4
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Registered User
Join Date: Apr 2007
Location: East Central Oklahoma
Posts: 75
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I have noticed a back fire between the gears and when I push in the clutch the rpm will drop to around 3 to 4 hundred rpm or the motor will die outright. When accelerating there is a deffinatly a miss because the jeep will hit miss hit miss (AKA BUCK) ant ideas? This is getting real old.
__________________
[B]1991 Wrangler Renagade[/B]
31x10.50 TRXUS M/T
Hurc-lined
Centerlines
Airaid
For the record, 3,692 Renegades were built in 1991.
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04-27-2007, 02:56 PM
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#5
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Automotive Neurosurgeon
Join Date: Sep 2006
Location: Houston, Texas
Posts: 2,176
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Check for slack in the timing chain. They get old after a while.
__________________
Handicapped license plates are not for mentally handicapped people -
Holley Carb thread
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04-27-2007, 06:06 PM
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#6
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Web Wheeler
Join Date: Dec 2006
Location: , NJ
Posts: 3,358
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does that cylinder have full compression?
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04-27-2007, 06:27 PM
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#7
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Registered User
Join Date: Aug 2005
Location: alabama
Posts: 1,104
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Yea, do a compression check.
__________________
'93 YJ 4.0L, AX-15, NP-231, SYE, CV, 8.8in rear, OME 2.5 lift, WJ knuckle/brake conversion, hydroboost. Warn M10000 winch. Hope to some day build a stroker for it.
'79 Cherokee Chief, 401 MPFI fuel injection, T-18/D-20 and hydroboost. Otherwise stock.
Future mods: NV4500, NP205, high pinion D60 front and smooth bottom D60 rear, e-lockers front & rear. SOA with 35X12.50's
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04-27-2007, 10:42 PM
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#8
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Registered User
Join Date: Dec 2006
Location: MI
Posts: 338
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this is going to sound so silly, but you DID make sure you put the wires back in the right order? can you give us more information about the miss? at a specific rpm? or it just dose it while running?
Will
__________________
94 was a great year for the yj, 2006 was a great year when i put the sport cage in it...
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04-28-2007, 10:13 AM
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#9
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Registered User
Join Date: Apr 2007
Location: East Central Oklahoma
Posts: 75
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I have not done a compression check yet, and it seems to miss at low rpm. It will rum fine for a while and all of a sudden start the bucking and I am not for sure if the back fire is constant I only hear it a slow speed. A mech I took it to said that the miss was in the 5th cylinder but he couldn't find the cause???? with the backfire could this be a timing issue?
__________________
[B]1991 Wrangler Renagade[/B]
31x10.50 TRXUS M/T
Hurc-lined
Centerlines
Airaid
For the record, 3,692 Renegades were built in 1991.
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04-28-2007, 10:19 AM
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#10
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XJ on 37's
Join Date: Jul 2006
Location: missouri via blackpool,lancs.
Posts: 10,435
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if you didnt move the distributor, i'd doubt it, unless it needs replacing.
you need to do a comp check, and rule out any mechanical issues. the timing gear does wear, but is normally accompanied by a slapping timing chain.
sounds more electrical to me...
you can get a bad plug and lead, so just cause they are new, dont totally rule that out....
martin
__________________
1998 XJ on 37's.JK Rubi axles with chromo shafts and ctm's, 4:1 transfer case, etc etc etc.The Cherylkee....
2003 Range Rover HSE, 4.4 Quad Cam.
1998 Range Rover 4.6 HSE
2000 4.7 4WD WJ with a rebuilt motor.
4.3/700r4/new frame buildup (YJ)....
http://www.jeepforum.com/forum/f12/swap-offically-underway-324622/
Years to gain the hands on experience, and offer it freely.
Minutes to gain the knowledge from the internet, and quote it just as freely.
Choose wisely!
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05-05-2007, 01:52 PM
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#11
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Registered User
Join Date: Apr 2007
Location: East Central Oklahoma
Posts: 75
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Problem Solved!!!!!
It turned out to be the Automatic Idle speed motor.
In my posts I talked about a gummed up AISM, so I replaced it and the jeep was idling at 2500 rpm so I disconected th Neg. battery cable and cleared the ECM. After that the ECM went into a programming mode and retaught its self the position of the AISM comparing the RPM with the seat position dropping 500 rpm at a time, until propre Idle rpm was achived, all of this took about 1 minute. Now the codes are gone and I am happy 
__________________
[B]1991 Wrangler Renagade[/B]
31x10.50 TRXUS M/T
Hurc-lined
Centerlines
Airaid
For the record, 3,692 Renegades were built in 1991.
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YJ buckin like a Mule & my saddle dont fit...HELP!
