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11-14-2009, 03:16 PM
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#1
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Registered User
Join Date: May 2007
Location: Tempe, AZ
Posts: 61
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96 xj wont stay running HELP PLZ!
i have a 96 xj 4.0L.. i was sitting at a light when all the sudden my ride started to die out like there was no gas.. it back fired alil and died. so now it sort of starts and when it does start the only way to keep it going is if you keep my feet pumping on the gas peddle and if you dont it dies again... any help from you guys would be most appreciated.
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100% NDN and STR8 from the REZ
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11-14-2009, 03:26 PM
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#2
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Registered User
Join Date: Feb 2008
Location: north Ga.
Posts: 14,160
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I would clean and freshen all the battery connections, and ground straps. Have the battery load tested as well. The PCM doesn't like low voltage and that could be your problem. Even if it turns the engine over very well it can still have low voltage and disrupt the computer. Do you have a check engine light?
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- '95 XJ country edition, 4" coils/3/4" spacers, HD leafs with extra main added in, Ironman adjustable control arms, rough country shackles, aussie locker, JK rubicon shocks, 35" mudder's, soft 8's, cobra cb
- '99 WJ limited, 4.7L, 3" IRO lift. Bilstein shocks, JK rubicon wheels, 255/70/17's, carolina driveshaft, IRO adjustable control arms, IRO adjustable A-arm
- Sold '00 TJ, 4" lift, rusty's adjustable control arms, skyjacker shocks, rock krawler adj. trac-bar,rugged ridge SYE and RE driveshaft, soft 8's, 35" mud king xt's,XJ HP D30 w/aussie locker, 4:88 yukon gears, hella 500's, rock crusher diff covers
4. 04 Dodge ram 1500 quadcab, yes, it has a hemi.
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11-14-2009, 03:37 PM
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#3
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Registered User
Join Date: May 2007
Location: Tempe, AZ
Posts: 61
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nope there is no check engine light on.
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100% NDN and STR8 from the REZ
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11-14-2009, 03:49 PM
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#4
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Registered User
Join Date: Feb 2008
Location: north Ga.
Posts: 14,160
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It could be a low fuel pressure issue or a lean running condition if it is backfiring. I would try getting the battery connections in good shape and testing the battery/alternator first and once that is ruled out you can diagnose it farther.
__________________
- '95 XJ country edition, 4" coils/3/4" spacers, HD leafs with extra main added in, Ironman adjustable control arms, rough country shackles, aussie locker, JK rubicon shocks, 35" mudder's, soft 8's, cobra cb
- '99 WJ limited, 4.7L, 3" IRO lift. Bilstein shocks, JK rubicon wheels, 255/70/17's, carolina driveshaft, IRO adjustable control arms, IRO adjustable A-arm
- Sold '00 TJ, 4" lift, rusty's adjustable control arms, skyjacker shocks, rock krawler adj. trac-bar,rugged ridge SYE and RE driveshaft, soft 8's, 35" mud king xt's,XJ HP D30 w/aussie locker, 4:88 yukon gears, hella 500's, rock crusher diff covers
4. 04 Dodge ram 1500 quadcab, yes, it has a hemi.
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11-14-2009, 03:49 PM
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#5
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It's the crank sensor!
Join Date: Nov 2007
Location: Central Minnesota, MN
Posts: 7,976
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I agree that the battery is the most suspect. And yes, you can have a battery that is strong enough to start the engine but weak enough to confuse the engine management system and not keep the engine running at idle.
Load test your battery for starters. If that checks out, check fuel pressure at the schrader valve on the fuel rail.
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99 Cherokee, 4.0 AW4, NP242
Past Jeeps: 49 Willys, 81 Scrambler, 88 Comanche
Without "data", all you have is an opinion!
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11-14-2009, 04:26 PM
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#6
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Registered User
Join Date: Mar 2005
Location: Buffalo, NY
Posts: 796
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Probably battery issue.. but a bad O2 sensor can make an engine sputter and backfire. see this recent thread.. http://www.jeepforum.com/forum/f11/4...ileage-897850/
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1993 XJ Sport RIP (Parts) - 189k, white, 4.0, automatic, command-trac NP231
1996 XJ Sport Daily Driver - 95k, stone white, 4.0, automatic, selec-trac NP242, Tow Hooks, SRB fog lights, tinted glass.
2005 Wrangler Rubicon Summer Toy - 8k, 100% STOCK...silver, automatic, soft and hard tops and doors
My Pics
"life moves pretty fast... if you don't stop and look around once and awhile, you could miss it"...F. Bueller
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11-15-2009, 02:37 PM
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#7
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Registered User
Join Date: May 2007
Location: Tempe, AZ
Posts: 61
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Quote:
Originally Posted by artboy
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hey Artboy witch o2 sensor did you replace?
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100% NDN and STR8 from the REZ
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11-15-2009, 02:54 PM
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#8
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Registered User
Join Date: May 2007
Location: Tempe, AZ
Posts: 61
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oh yeah guys this is what iv done so fare i checked all grounds got battery tested.. battery is good, changed tps but nothing, so then i took off IAC and throttle body and cleaned it but nothing again, checked fuses , distributor cap & rotor all is good what else should i check?
im thinking O2 sensor but that cost $68 at autozone does anyone know where i can find one cheaper?
__________________
100% NDN and STR8 from the REZ
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11-15-2009, 03:53 PM
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#9
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Registered User
Join Date: Mar 2005
Location: Buffalo, NY
Posts: 796
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I replaced both but the front one was the one causing problems
__________________
1993 XJ Sport RIP (Parts) - 189k, white, 4.0, automatic, command-trac NP231
1996 XJ Sport Daily Driver - 95k, stone white, 4.0, automatic, selec-trac NP242, Tow Hooks, SRB fog lights, tinted glass.
2005 Wrangler Rubicon Summer Toy - 8k, 100% STOCK...silver, automatic, soft and hard tops and doors
My Pics
"life moves pretty fast... if you don't stop and look around once and awhile, you could miss it"...F. Bueller
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11-15-2009, 06:53 PM
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#10
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Registered User
Join Date: May 2007
Location: Tempe, AZ
Posts: 61
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ugh im going to start pulling out my hair damn  ok guys this is what ive done today again... ive replaced the o2 sensor the one before the the cat and nothing. then i thought maybe it could be the cps for some odd reason and since that part was still under warranty id change that out so i did but with no luck..
could it be the IAC? i took it out yesterday and cleaned it out with throttle body cleaner and put it back in. but could that be the problem?..maybe its bad. idk guys im thankful for all the help but is there anything else you guys could recommend?..
__________________
100% NDN and STR8 from the REZ
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11-15-2009, 07:30 PM
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#11
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Registered User
Join Date: Mar 2005
Location: Buffalo, NY
Posts: 796
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when mine started getting funky my mechanic friend at the stealership replaced the IAC and cleaned the throttle body.. didn't do anything. .. then a another friend hooked up a scanner and drove it around when it was barely driveable,, said the readings were bouncing all over but not throwing a code... He said o2 sensor was worth a shot...that fixed it ...took me 5 months and about $200 to figure it out. wish I could help... sorry
__________________
1993 XJ Sport RIP (Parts) - 189k, white, 4.0, automatic, command-trac NP231
1996 XJ Sport Daily Driver - 95k, stone white, 4.0, automatic, selec-trac NP242, Tow Hooks, SRB fog lights, tinted glass.
2005 Wrangler Rubicon Summer Toy - 8k, 100% STOCK...silver, automatic, soft and hard tops and doors
My Pics
"life moves pretty fast... if you don't stop and look around once and awhile, you could miss it"...F. Bueller
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11-15-2009, 09:33 PM
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#12
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Registered User
Join Date: Nov 2004
Posts: 2,736
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I would get a scanner on it. Is the fuel filter new?
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11-15-2009, 10:19 PM
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#13
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Registered User
Join Date: May 2007
Location: Tempe, AZ
Posts: 61
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Quote:
Originally Posted by carnuck
I would get a scanner on it. Is the fuel filter new?
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yeah i replaced the fuel filter on friday.
__________________
100% NDN and STR8 from the REZ
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11-16-2009, 04:43 AM
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#14
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It's the crank sensor!
Join Date: Nov 2007
Location: Central Minnesota, MN
Posts: 7,976
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I see no mention of checking FUEL PRESSURE. That should be next. Verifying fuel delivery is pretty important and something that is easy to do. Hook a fuel pressure gauge up to the schrader valve on the fuel rail. Your concentration so far has been on sensors but proper fuel delivery is critical. If that checks out, I'd test the throttle position sensor.
__________________
99 Cherokee, 4.0 AW4, NP242
Past Jeeps: 49 Willys, 81 Scrambler, 88 Comanche
Without "data", all you have is an opinion!
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11-16-2009, 08:32 AM
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#15
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Registered User
Join Date: May 2007
Location: Tempe, AZ
Posts: 61
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Quote:
Originally Posted by tjwalker
I see no mention of checking FUEL PRESSURE. That should be next. Verifying fuel delivery is pretty important and something that is easy to do. Hook a fuel pressure gauge up to the schrader valve on the fuel rail. Your concentration so far has been on sensors but proper fuel delivery is critical. If that checks out, I'd test the throttle position sensor.
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hey thanks ill do the fuel pressure test next.. but i already got a new tps and that didnt work. thx
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100% NDN and STR8 from the REZ
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>
96 xj wont stay running HELP PLZ!
