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01 xj random misfire
#1
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Model: Cherokee
01 xj random misfire
My wifes 01 xj at first when i got it i did a tune up on it. put champion plugs in it. a couple weeks later it threw a cylinder 3 misfire code. than i changed the coil pack and it still threw the code. my next step was to swap injectors 2 and 3 it threw the code again in cylinder 3. i have ran this jeep for about two months with just the one clyinder misfiringand its been working just fine. just yesterday i was driving it back from central washington and it started to randomly misfire. so i pulled over shut it off and let it cool down when i started it up again the engine ran fine for about 60 miles than it started up again. today i changed the coil pack back to the original one that it came with, and not more than after 15 minutes of driving it started doing it again. so any insight on this problem would be a great help
#2
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Location: Coeur d' Alene, Idaho
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Year: 1998
Model: Cherokee
Engine: 4.0 rebuilt w/ bored TB, banks header, upgraded ignition, 3 row rad, high flow h2o pump, 180* t-stat
there is a fix-it thing on this...cant remember exactly what its called
BUT it calls for a heat sleeve over the #3 fuel injector to prevent the vaporization of fuel in the injector due to heat from the exhaust manifold, which results in a misfire.
get some heat tape and wrap the #3 injector, should fix your issue
BUT it calls for a heat sleeve over the #3 fuel injector to prevent the vaporization of fuel in the injector due to heat from the exhaust manifold, which results in a misfire.
get some heat tape and wrap the #3 injector, should fix your issue
#4
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Year: 1998
Model: Cherokee
Engine: 4.0 rebuilt w/ bored TB, banks header, upgraded ignition, 3 row rad, high flow h2o pump, 180* t-stat
that sounds like a heat soak issue....fuel is vaporizing before it gets a chance to burn in the cylinders
wrap all the injectors and see what happens...
where in Washington are you located?
wrap all the injectors and see what happens...
where in Washington are you located?
#5
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Year: 1996 Sport
Model: Cherokee
Engine: 4.0L H.O.
01 shouldn't have heat soak issue, but it is possible... https://www.cherokeeforum.com/f2/3rd...misfire-26952/
....have you checked the injector o-rings?!?!? what's your fuel pressure at the rail, engine on? should be ~49psi...look/smell for fuel leaking around the o-rings...if leaking, replace ALL o-rings, two per injector...make sure to rub a dab of oil on the o-rings so they don't rip...check fuel rail pressure.
....have you checked the injector o-rings?!?!? what's your fuel pressure at the rail, engine on? should be ~49psi...look/smell for fuel leaking around the o-rings...if leaking, replace ALL o-rings, two per injector...make sure to rub a dab of oil on the o-rings so they don't rip...check fuel rail pressure.
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#8
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Year: 1994 1993
Model: Cherokee
Engine: 4.0
How is it going now? I know you`ve probably heard a lot of horrible prices about getting this fixed professionally but it`s not all that hard to do if you are a fairly competent home mechanic.
#9
Does anyone have any pictures of wrapped injectors? I'm just trying to understand this that's all. I keep getting my intermittent cylinder 6 misfire and I'd like to try this out. Also, which one do I wrap for number 6?
#13
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Location: Easthampton, MA
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Year: 1999
Model: Cherokee
Engine: 4.0
Well, I am going to do all 6 of mine too. My idle although it isn't all that great when cold, gets worse when hot, and I have changed everything. I am also going to do a compression test this week, if it will ever stop frickin raining here in FL....
#15
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Year: 1999
Model: Cherokee
Engine: 4.0
I ended up buying a roll of heat tape yesterday(Advance auto $17) and wrapped all 6 injectors with a couple layers of it, I also wrapped the entire fuel rail while I was at it. I wrapped the crap out of the whole thing. I will update to see if my annoying idle miss goes away... I will put a pic in here too.