skimore11 Posted January 16, 2008 Posted January 16, 2008 Alright I have my new 4.0 in my MJ and its a big improvement. Found out I have a pin hole leak in the bottom center of my pan so I will have to replace that this weekend at my 500 mile oil change. The larger issue is that there is a slight shudder over 1800 rpm. It is most noticeable when the rpms are held constant and under load. At first start up I had to adjust the timing by turning the distributor cap to eliminate misfiring. This is not nearly as rough a shudder. I don't know if this makes sense as written but any ideas would be appreciated.
Pete M Posted January 16, 2008 Posted January 16, 2008 At first start up I had to adjust the timing by turning the distributor cap to eliminate misfiring. :hmm: The timing is set and adjusted by the computer, not the distributor orientation.
Bansheemanche Posted January 19, 2008 Posted January 19, 2008 Mine does the same thing when it is first cold then gets better as it warms up. My tranny is getting tired though so I figured it was that.
chicofuentes0224 Posted January 20, 2008 Posted January 20, 2008 Well if you guys figure this out let me know. I have the same problem.
Eagle Posted January 20, 2008 Posted January 20, 2008 Are you running new spark plugs AND new spark plug wires? Missing/skipping under load is a classic symptom of bad ignition wires.
chicofuentes0224 Posted January 20, 2008 Posted January 20, 2008 I am. Sorry don't know if you were asking me. :oops:
Eagle Posted January 20, 2008 Posted January 20, 2008 I am. Sorry don't know if you were asking me. :oops: Sorry. I was asking the original poster -- but it applies to anyone with skip/miss in the engine. Check the plug wires.
skimore11 Posted January 21, 2008 Author Posted January 21, 2008 Alright so I thought this went away then it came back and went away and back. The plugs could stand to be replaced but are not awful. The wires and distributor are new but the wires often feel loose when I check them. I am going to get new plugs and do electric grease when I get a chance as well as see if I can't tighten up the connections. I will keep you posted. Thanks, Mike
chicofuentes0224 Posted January 22, 2008 Posted January 22, 2008 Aybody think this could be an ignition coil or ignition control module problem?
99ncxj Posted January 23, 2008 Posted January 23, 2008 my 99 xj does it every once in a while when its cold and i'm taking off from my drive way. it studders for a second then i stomp on it. the studdering stops and the rear locker kicks in and it wakes up the neighbors.
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