4.0l Runs Rough
11-07-2010, 06:13 PM
#1
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Year: 1989
Model: Wagoneer
Engine: 368 V8
4.0l Runs Rough
I have a 1991 Cherokee with a 95 Grand Cherokee 4.0l Motor. I have replaced Spark plugs, Wires, Cap, Rotor, and Temp Sensor. It Misses and idles Rough. What could be the problem? I am not sure what else to try. Got any Ideas?
11-09-2010, 09:58 PM
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Year: 1989
Model: Wagoneer
Engine: 368 V8
I have also replaced the fuel filter... Not sure what is wrong... could be map sensor? It almost seems like a timing issue as well. I am lost. It could be a vacuum leak i suppose. Where do you think i should start?
11-09-2010, 10:01 PM
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Year: 1996
Model: Cherokee
Engine: 4.0L HO
Run some seafoam in your fuel tank. Also, run some good fuel. Mine runs rough on everything, even 87 with seafoam in the tank, but if I run 91 octane with 0 ethanol, it runs smooth. Try to find a station near you that sells E0 fuel (there is one here, and its 10 miles out of town)
11-10-2010, 07:08 AM
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Year: 1998 XJ
Model: Cherokee
Engine: 4.0L
Run some seafoam in your fuel tank. Also, run some good fuel. Mine runs rough on everything, even 87 with seafoam in the tank, but if I run 91 octane with 0 ethanol, it runs smooth. Try to find a station near you that sells E0 fuel (there is one here, and its 10 miles out of town)
11-10-2010, 03:59 PM
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Year: 1989
Model: Wagoneer
Engine: 368 V8
Really? You that that is all it is? Hmmmmmmm. I did not think it was going to be that simple. I will try that and see if that works. I am willing to try anything at this point to get it to run right. Do you guys know where i can get something online that will explain how to change the transfer case chain? I am kinda nervous about doing it. It will be the first time attacking something like that. 
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