94 4.0 someone please help
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Model: Cherokee (XJ)
94 4.0 someone please help
Im new to this so forgive me if I make some mistakes. I have got to get this thing going it's my only ride. Im losing work,and money! I drove it into our barn/shop. Reason, while driving when taking off it would backfire an pop. I got it home changed plugs, wires,cap was new didn't change it. Changed the IAC, throttle position sensor,even the throttle body. It will turn over an putter like it wants to start then when you let off the key it stutters an backfires. Do that a few times then play with the gas pedal an you can keep it running somewhat but not enough to move it. Then it'll rev up itself and suddenly drop rpm an backfire so loud then die. I'm stuck and have no help or another way to get around any ideas or suggestions would be very appreciated
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Year: 1988
Model: Cherokee (XJ)
Engine: 4.0L
Did this start happening "all of a sudden"? Have you done anything to it recently?
Cap is new? How new? Verify the firing order. Make sure the rotor is on securely.
Cap is new? How new? Verify the firing order. Make sure the rotor is on securely.
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Model: Cherokee (XJ)
Cap maybe a month
Fuel pressure seems ok, and idk if I'm doing this correctly so sorry if I'm not. Firing order seems on spot I read a few post stating the 94 it's kinda hard to mess the timing up. But I've even changed the computer an does the exact same thing. The only code if had if I counted the check engine light flashing correct was IAC fault due to hight or low voltage
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35 pounds, and I got cylinder one tdc. An set the rotary a little before the point for wire one. Took me about 7 trys.when it finally starts I can only gently tap the throttle if I try to give it more then a tap it instantly starts backfiring. I let off an it dies then takes forever to start again.
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#8
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Year: 1988
Model: Cherokee
Engine: 4.0
Note from DJ
We need more information on your backfire problem.
Is it backfiring through the through the throttle body?
Or is it backfiring through the through the tail pipe?
This information will give a hint as to cause of your problem.
Backfires through the tail pipe is generally caused by a rich condition.
Backfiring through the intake is generally caused by a lean condition.
We need more information on your backfire problem.
Is it backfiring through the through the throttle body?
Or is it backfiring through the through the tail pipe?
This information will give a hint as to cause of your problem.
Backfires through the tail pipe is generally caused by a rich condition.
Backfiring through the intake is generally caused by a lean condition.
#9
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Model: Cherokee (XJ)
Backfiring
Note from DJ
We need more information on your backfire problem.
Is it backfiring through the through the throttle body?
Or is it backfiring through the through the tail pipe?
This information will give a hint as to cause of your problem.
Backfires through the tail pipe is generally caused by a rich condition.
Backfiring through the intake is generally caused by a lean condition.
We need more information on your backfire problem.
Is it backfiring through the through the throttle body?
Or is it backfiring through the through the tail pipe?
This information will give a hint as to cause of your problem.
Backfires through the tail pipe is generally caused by a rich condition.
Backfiring through the intake is generally caused by a lean condition.
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Timing
I've played with the distributor, and it is definitely my timing. I have fought with it for the past 5 hours an I get close real close but still off! I've never had this much trouble. It's just me minimum tools no timing light no help
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Timing
I've played with the distributor, and it is definitely my timing. I have fought with it for the past 5 hours an I get close real close but still off! I've never had this much trouble. It's just me minimum tools no timing light no help
#12
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Im new to this so forgive me if I make some mistakes. I have got to get this thing going it's my only ride. Im losing work,and money! I drove it into our barn/shop. Reason, while driving when taking off it would backfire an pop. I got it home changed plugs, wires,cap was new didn't change it. Changed the IAC, throttle position sensor,even the throttle body. It will turn over an putter like it wants to start then when you let off the key it stutters an backfires. Do that a few times then play with the gas pedal an you can keep it running somewhat but not enough to move it. Then it'll rev up itself and suddenly drop rpm an backfire so loud then die. I'm stuck and have no help or another way to get around any ideas or suggestions would be very appreciated
#13
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Year: 1989
Model: Comanche (MJ)
Engine: 4.0
https://www.jeepforum.com/forum/f12/timing-4-0l-508405/
http://cruiser54.com/?p=68
#14
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Not sure what you're doing, but these instructions might help. Beware some of the drawing for firing order are wrong, including the one in Haynes. The one on Cruisers site is accurate.
https://www.jeepforum.com/forum/f12/timing-4-0l-508405/
http://cruiser54.com/?p=68
https://www.jeepforum.com/forum/f12/timing-4-0l-508405/
http://cruiser54.com/?p=68
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Done with it, engine swap
I've done everything every timing order I've seen. Lined it up as detailed an still it either turns over an literally idles like it's got one tell of a cam then dies or it backfires through intake an doesn't run. How hard is it to put a Chevy motor in?