I got a prob.

finneys98xj · 06-28-2009, 07:56 PM

My jeep is being a BITCH! It back fires between 15-2000 RPMs and acts like it backfires and lose power for a moment. Things I know it aint are CPS, coil, Dizzy, plug wires, plugs, battery, and I'm getting good fuel pressure. I need help guys please!

McRay · 06-28-2009, 08:12 PM

Might try some Marvel Mystery oil for sticky valves I use it in every thing that I have.

Trooper · 06-28-2009, 08:25 PM

Well before I read the second line I thought TPS then I noticed you havent replaced it. Go to a boneyard and grab every sensor you can, pocket them and start plugging. It is called long term lending and a hell of a lot cheaper.

finneys98xj · 06-29-2009, 07:25 PM

TPS didnt fix it either,.

Veeb0rg · 06-30-2009, 01:36 AM

you pull codes?

finneys98xj · 06-30-2009, 07:29 AM

Quote:

Originally Posted by Veeb0rg

you pull codes?

aint giving any

Trooper · 06-30-2009, 05:55 PM

Here is a long shot but it makes sense. BAD GAS , it wouldnt throw a code for bad gas and it can definately cause running issues. Add some more gas in the tank and hold it at 15- 2000 rpms a while and see if it gets better.

poorboy_616 · 07-02-2009, 09:48 PM

Bad MAP sensor will cause this......

finneys98xj · 07-03-2009, 08:56 AM

Well i unpluged half of my harness and pluged it back in and it cleared up all except it misses every once in awhile while driving.

4.3L XJ · 07-03-2009, 09:01 AM

Are your connections corroded?

finneys98xj · 07-03-2009, 02:04 PM

no but the plug right behind the vavle cover if i unplug it and replug it will run right for awhile what does that plug go to?

jeepride · 07-03-2009, 02:39 PM

Sounds like the plug in for the cps

finneys98xj · 07-03-2009, 09:59 PM

Quote:

Originally Posted by jeepride

Sounds like the plug in for the cps

It aint i know which that is I just replaced it.

Trooper · 07-04-2009, 05:09 PM

Just trace it and see.

finneys98xj · 07-04-2009, 10:16 PM

Quote:

Originally Posted by Trooper

Just trace it and see.

I aint had the time but I know it runs under the heep.

06-28-2009, 07:56 PM	#1
finneys98xj Veteran RIP 1998 & 1993 Both XJs iTrader: (1) Join Date: Sep 2008 Location: Sandy Level, Va Posts: 1,088	I got a prob. My jeep is being a BITCH! It back fires between 15-2000 RPMs and acts like it backfires and lose power for a moment. Things I know it aint are CPS, coil, Dizzy, plug wires, plugs, battery, and I'm getting good fuel pressure. I need help guys please! __________________ RIP Purple People Eater 98 Jeep XJ Sport 4.0L AW4 Chryo 8.25 D30 Purple from the factory with a sun roof.

06-28-2009, 08:12 PM	#2
McRay Seasoned 1996 2001 Cherokee 2 WD & Cherokee Sport iTrader: (0) Join Date: Feb 2009 Location: Conroe, Tx Posts: 65	Might try some Marvel Mystery oil for sticky valves I use it in every thing that I have. __________________ 1996 Jeep Cherokee 2 WD 4.0 Transmission Aisin AW 30-43LE 2001 Jeep Cherokee Sport 4.0

06-29-2009, 07:25 PM	#4
finneys98xj Veteran RIP 1998 & 1993 Both XJs iTrader: (1) Join Date: Sep 2008 Location: Sandy Level, Va Posts: 1,088	TPS didnt fix it either,. __________________ RIP Purple People Eater 98 Jeep XJ Sport 4.0L AW4 Chryo 8.25 D30 Purple from the factory with a sun roof.

07-02-2009, 09:48 PM	#8
poorboy_616 Experienced 1987 XJ iTrader: (0) Join Date: May 2009 Location: Ocean Park, WA Posts: 132	Bad MAP sensor will cause this...... __________________ Nose to tail: '87 XJ D30/4.0L/AW4/NP231/D44

07-03-2009, 08:56 AM	#9
finneys98xj Veteran RIP 1998 & 1993 Both XJs iTrader: (1) Join Date: Sep 2008 Location: Sandy Level, Va Posts: 1,088	Well i unpluged half of my harness and pluged it back in and it cleared up all except it misses every once in awhile while driving. __________________ RIP Purple People Eater 98 Jeep XJ Sport 4.0L AW4 Chryo 8.25 D30 Purple from the factory with a sun roof.

06-28-2009, 08:25 PM	#3
Trooper Jr Member 1996 XJ iTrader: (0) Join Date: Dec 2008 Location: Rockford IL Posts: 398	Well before I read the second line I thought TPS then I noticed you havent replaced it. Go to a boneyard and grab every sensor you can, pocket them and start plugging. It is called long term lending and a hell of a lot cheaper.

06-30-2009, 01:36 AM	#5
Veeb0rg Experienced 1995 Cherokee iTrader: (0) Join Date: Apr 2009 Location: Glen Burnie, MD Posts: 168	you pull codes?

06-30-2009, 05:55 PM	#7
Trooper Jr Member 1996 XJ iTrader: (0) Join Date: Dec 2008 Location: Rockford IL Posts: 398	Here is a long shot but it makes sense. BAD GAS , it wouldnt throw a code for bad gas and it can definately cause running issues. Add some more gas in the tank and hold it at 15- 2000 rpms a while and see if it gets better.

07-03-2009, 09:01 AM	#10
4.3L XJ Veteran 86 XJ Laredo iTrader: (0) Join Date: Dec 2008 Location: Chico, CA Posts: 2,080	Are your connections corroded?

07-03-2009, 02:04 PM	#11
finneys98xj Veteran RIP 1998 & 1993 Both XJs iTrader: (1) Join Date: Sep 2008 Location: Sandy Level, Va Posts: 1,088	no but the plug right behind the vavle cover if i unplug it and replug it will run right for awhile what does that plug go to? __________________ RIP Purple People Eater 98 Jeep XJ Sport 4.0L AW4 Chryo 8.25 D30 Purple from the factory with a sun roof.

07-03-2009, 02:39 PM	#12
jeepride Jr Member 98 xj iTrader: (0) Join Date: Sep 2008 Location: Belle West Virginia Posts: 332	Sounds like the plug in for the cps __________________ 98 xj 4.0L aw4 231 tcase jcr stage 1 sliders 3 inch aal 31 1050 maxxis bighorn's cobra cb off road commode roll of toilet paper

07-04-2009, 05:09 PM	#14
Trooper Jr Member 1996 XJ iTrader: (0) Join Date: Dec 2008 Location: Rockford IL Posts: 398	Just trace it and see.

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