No power and Backfiring
01-30-2013, 05:35 PM
#1
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Year: 1991
Model: Cherokee
Engine: 4.0
No power and Backfiring
So my 91 XJ 4.0L started to run like crap awhile ago and cant figure it out. When i first start it up it runs great. After about 5-10 miles it will start to hesitate and backfire. It seems not to want to go over 3000rpm. if i shut it off for about 1 minuite it runs fine for like 5 more miles then the same thing all over.
It has brand new plugs, cap, rotor, wires, TPS, coil, o2 sensor, fuel air filters. also has no CAT.
Right now im at a loss
any help would be great.
It has brand new plugs, cap, rotor, wires, TPS, coil, o2 sensor, fuel air filters. also has no CAT.
Right now im at a loss
any help would be great.
Last edited by crumba42; 01-30-2013 at 05:39 PM.
01-30-2013, 05:45 PM
#2
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Location: Summerville, Ga
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Year: 1995
Model: Cherokee
Engine: 2.5 4 cyl.
Check your CPS wires. If they're close to your exhaust manifold they can cause it to malfunction once your jeep heats up. You can tell if they're being effected if the wires are bare and plastic coating is missing.
01-30-2013, 06:39 PM
#6
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Year: 1995
Model: Cherokee
Engine: 2.5 4 cyl.
Check the easy stuff first. Plugs, wires, distributor, battery, air filter, then check your brakes to make sure you dont have a seized caliper.
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01-31-2013, 12:17 AM
#11
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Year: 1990 Laredo
Model: Cherokee
Engine: 4.0 Inline 6 Renix
What's your fuel pressure? Check when cold then after it heats up...... How many miles on your jeep?
01-31-2013, 12:23 AM
#13
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Year: 1992
Model: Cherokee
Engine: I6
maybe the exhaust is blocked? my FSJ lost all power once and just wouldn't rev or anything. wouldn't even make it up a small hill on my farm, turns out squirrels had filled my exhaust and muffler up with nuts.. lil bastards
01-31-2013, 06:18 AM
#14
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Year: 1995
Model: Cherokee
Engine: 2.5 4 cyl.
01-31-2013, 07:39 AM
#15
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
