Misfire in cylinders 2&4
#1
Misfire in cylinders 2&4
I have a 1999 4.0 and it has a mis fire at idle but gets smoother after you give it gas. Cap rotor plugs and wires have been changed and still does it. What could it be?
#2
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Join Date: Oct 2010
Location: eastern NC
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Year: 2000
Model: Cherokee
Engine: 4.0L
valves not sealing-probably due to carbon would be the next thing I would suspect. Look into sea foam. I don't know much about the older jeeps but if you can switch around the injectors maybe try that first.
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Year: 2000
Model: Cherokee
Engine: 4.0L
Just noticed I read the year wrong (thought 1990) but info still applies. I've got a 2000 and seafoam has fixed a few slight misfires for me in the past. Big thread on it around somewhere but basically you just put a nail hole in the cap and let it trickle in the throttle body while idleing. Assuming it runs fine off idle this might fix it. if not move to the injectors-could have a few clogged. Injectors are easy to move around but you probably should buy new o-rings to be safe.
#7
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Year: Several
Model: Cherokee
Engine: 4.0
THINK!
If an injector was clogged, it would still be clogged above idle.
If the cast was plugged, same thing - above idle would be worse!
Sounds like a simple vacuum leak - blow cigarette smoke in a hose to the manifold, fix wherever it comes out!
SIMPLE, EASY, FREE!
If an injector was clogged, it would still be clogged above idle.
If the cast was plugged, same thing - above idle would be worse!
Sounds like a simple vacuum leak - blow cigarette smoke in a hose to the manifold, fix wherever it comes out!
SIMPLE, EASY, FREE!
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#11
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Year: 97
Model: Cherokee
Engine: 4.0
huh; 2 &4 are not adjacent... is it blown at cyl 3 as well?
I was gonna suggest a bad cap as 2&4 are right next to each other in the firing order hence on the cap.... possibly cross firing?
I was gonna suggest a bad cap as 2&4 are right next to each other in the firing order hence on the cap.... possibly cross firing?
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