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06-28-2009, 07:56 PM
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#1 |
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Veteran
RIP 1998 & 1993 Both XJs
Join Date: Sep 2008
Location: Sandy Level
Posts: 1,122
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I got a prob.
My jeep is being a *****! 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!
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RIP Purple People Eater 98 Jeep XJ Sport 4.0L AW4 Chryo 8.25 D30 Purple from the factory with a sun roof. |
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06-28-2009, 08:12 PM
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#2 |
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Seasoned
1996 2001 Cherokee 2 WD & Cherokee Sport
Join Date: Feb 2009
Posts: 70
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Might try some Marvel Mystery oil for sticky valves I use it in every thing that I have.
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1996 Jeep Cherokee 2 WD 4.0 Transmission Aisin AW 30-43LE 2001 Jeep Cherokee Sport 4.0 |
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06-28-2009, 08:25 PM
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#3 |
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Veteran
1996 XJ
Join Date: Dec 2008
Posts: 1,270
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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.
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06-29-2009, 07:25 PM
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#4 |
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Veteran
RIP 1998 & 1993 Both XJs
Join Date: Sep 2008
Location: Sandy Level
Posts: 1,122
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TPS didnt fix it either,.
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RIP Purple People Eater 98 Jeep XJ Sport 4.0L AW4 Chryo 8.25 D30 Purple from the factory with a sun roof. |
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06-30-2009, 01:36 AM
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#5 |
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Experienced
1995 Cherokee
Join Date: Apr 2009
Posts: 171
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you pull codes?
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06-30-2009, 07:29 AM
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#6 | |
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Veteran
RIP 1998 & 1993 Both XJs
Join Date: Sep 2008
Location: Sandy Level
Posts: 1,122
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Quote:
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RIP Purple People Eater 98 Jeep XJ Sport 4.0L AW4 Chryo 8.25 D30 Purple from the factory with a sun roof. |
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06-30-2009, 05:55 PM
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#7 |
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Veteran
1996 XJ
Join Date: Dec 2008
Posts: 1,270
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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.
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07-02-2009, 09:48 PM
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#8 |
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Experienced
1987 XJ
Join Date: May 2009
Location: Bellingham, WA
Posts: 154
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Bad MAP sensor will cause this......
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Nose to tail: '87 XJ D30/4.0L/AW4/NP231/D44 |
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07-03-2009, 08:56 AM
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#9 |
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Veteran
RIP 1998 & 1993 Both XJs
Join Date: Sep 2008
Location: Sandy Level
Posts: 1,122
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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. |
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07-03-2009, 09:01 AM
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#10 |
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Veteran
86 XJ Laredo
Join Date: Dec 2008
Location: Chico, CA
Posts: 3,996
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Are your connections corroded?
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07-03-2009, 02:04 PM
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#11 |
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Veteran
RIP 1998 & 1993 Both XJs
Join Date: Sep 2008
Location: Sandy Level
Posts: 1,122
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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?
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RIP Purple People Eater 98 Jeep XJ Sport 4.0L AW4 Chryo 8.25 D30 Purple from the factory with a sun roof. |
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07-03-2009, 02:39 PM
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#12 |
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Senior Member
98 xj
Join Date: Sep 2008
Location: Belle, West Virginia 25015
Posts: 517
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Sounds like the plug in for the cps
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98 xj 4.0L aw4 231 tcase jcr stage 1 sliders 3 inch aal cobra cb rough country warn tcase skid ruff stuff 825 diff skid. I'll keep my money my guns and my freedom you can keep the change |
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07-03-2009, 09:59 PM
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#13 | |
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Veteran
RIP 1998 & 1993 Both XJs
Join Date: Sep 2008
Location: Sandy Level
Posts: 1,122
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Quote:
__________________
RIP Purple People Eater 98 Jeep XJ Sport 4.0L AW4 Chryo 8.25 D30 Purple from the factory with a sun roof. |
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07-04-2009, 05:09 PM
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#14 |
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Veteran
1996 XJ
Join Date: Dec 2008
Posts: 1,270
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Just trace it and see.
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07-04-2009, 10:16 PM
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#15 | |
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Veteran
RIP 1998 & 1993 Both XJs
Join Date: Sep 2008
Location: Sandy Level
Posts: 1,122
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Quote:
__________________
RIP Purple People Eater 98 Jeep XJ Sport 4.0L AW4 Chryo 8.25 D30 Purple from the factory with a sun roof. |
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