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 91 wrangler stumbling fuel?
#824202
07/10/07 11:16 PM
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Joined: Jul 2007
Posts: 6
OP
Need a Spot
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91 fuel injected 4 banger, 5 speed. Falls flat on it's face when I get past 1500 rpm in any gear under a load, justs acts like it's dieing, pops, let off the throttle and she's idling great but no power. Neutral revving up to 4500 rpm and it falls flat. Opened the shrader valve on the fuel rail and have a good amount of fuel at idle until it stumbles, then it falls way off. I can hear the fuel pump humming. Turn the key on and it primes up. And can also hear it while running.
Any ideas?
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Re: 91 wrangler stumbling fuel?
[Re: jeepj3000]
#824203
07/10/07 11:25 PM
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Joined: Oct 2006
Posts: 2,079
Body Damage is Cool
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Gun it and run it!
1981 CJ5,258,T-176,D300,AMC 20,Dana 30,Trxus M/T 31x10.50, Rancho 5000's, GroundPounderFab front bumper, polyethylene gas tank, aluminum dash, AutoMeter gauges
What this country needs is unemployed politicians.
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Re: 91 wrangler stumbling fuel?
[Re: jeepj3000]
#824204
07/10/07 11:30 PM
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Joined: Jul 2007
Posts: 10
Need a Spot
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hey pal have you checked your ignition system,is your beast electronic fuel injected and electronic ignition check alternator,or have you checked fuel pressure under load to see if the pressure drops.
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Re: 91 wrangler stumbling fuel?
[Re: Brown81CJ5]
#824205
07/11/07 01:53 AM
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Joined: Jul 2007
Posts: 6
OP
Need a Spot
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tried a fuel filter, was better... but won't turn over 3000rpm in 3rd or over 2400 in 4th. I have a spring over w/ 33's so I need the rpm's. Which shouldn't be an issue anyway. If you try to accelerate hard past thos rpm's it just falls flat and will backfire from time to time.
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Re: 91 wrangler stumbling fuel?
[Re: jeepj3000]
#824206
07/11/07 03:07 AM
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Joined: Jul 2003
Posts: 512
Rock Warrior
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How about a plugged cat/muffler? Does the exhaust make a whistling sound?
03 TJ 5 Speed I-6 30X9.50 BFG KO's
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Re: 91 wrangler stumbling fuel?
[Re: fishtaker]
#824207
07/11/07 04:20 AM
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Joined: Jul 2007
Posts: 6
OP
Need a Spot
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How about a plugged cat/muffler? Does the exhaust make a whistling sound? no whistling sound, new flowmaster muffler. The fuel flow out of the shrader valve is very minimal when I push it up to high rpm's. I'll try to get a guage tommorrow to put on it to see what kind of pressur I have.
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Re: 91 wrangler stumbling fuel?
[Re: jeepj3000]
#824208
07/11/07 04:49 AM
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Joined: Jan 2007
Posts: 353
Mudrunner
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check valve?
or is that just for starting?
Last edited by playinmud; 07/11/07 04:49 AM.
WHEN THE ROAD ENDS, THE FUN BEGINS
97 sahara, 4in skyjacker lift, 33in tires, borla header & catback, 10in subs
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Re: 91 wrangler stumbling fuel?
[Re: playinmud]
#824209
07/11/07 01:35 PM
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Joined: Oct 2006
Posts: 2,079
Body Damage is Cool
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Just curious as to what gears you are running with those 33's?
Gun it and run it!
1981 CJ5,258,T-176,D300,AMC 20,Dana 30,Trxus M/T 31x10.50, Rancho 5000's, GroundPounderFab front bumper, polyethylene gas tank, aluminum dash, AutoMeter gauges
What this country needs is unemployed politicians.
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Re: 91 wrangler stumbling fuel?
[Re: Brown81CJ5]
#824210
07/11/07 02:37 PM
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Joined: Mar 2005
Posts: 88
Getting the Wheeling Fever
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maybe a clogged fuel injector or one going on you.
4.2 '87 yj, 263,000 miles, mopar mpi, 33" mud bfg, skyjacker 4", 3.73 gears, arb lockers-f and r., tom wood's 2.07 shaft conversion, tom wood's hd driveshaft, magnaflow/custom exhaust, 4wd bumper/swing-out tire carrier
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Re: 91 wrangler stumbling fuel?
[Re: Brown81CJ5]
#824211
07/11/07 04:51 PM
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Joined: Jul 2007
Posts: 6
OP
Need a Spot
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Just curious as to what gears you are running with those 33's? 4.10 have had this jeep for a few years, problem just started a few days ago.
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