very rough idle

[oldjeepster]

Hi all, I am new to this forum but have had my jeep for 4 years. I have a question for the guys and gals who have 4 bangers in their jeeps. Mine is a 95 yj with the 2.5 and it idles very rough. It has done that since I have owned it. But lately it seems like it is getting worse. Any help will do. P.S. gas milage really sucks in town and on interstate. Thanks :x :x

[Blupupher]

Have you done anything to it yet? Plugs, wires, dist. cap, fuel filter, air filter, carb cleaner ect?

[oldjeepster]

:( Yes I have done all of that, but it still vibrates very badly when idleing. It runs just fine on the road, but being a 4 banger it has never had much speed to it until it hits 45 mph and then it will really go.

[Blupupher]

Have you sprayed the Idle air control valve with carb cleaner? On the 4 cyl, I'm not even sure it has one. Just start taking off stuff around the throttle body that has wires running to it and spray them with cleaner.

[Floyd]

My Jeep has a rough idle, but so did my 93 YJ. If I turn the wheel hard and back to center while sitting in the driveway, the engine will rev and then almost stutter some of the time. My 93 did this also. I think it's just a 2.5L Jeep thing. It's not a muscle car or a finely tuned luxury ride, but it's paid for and it runs. I've even used Bosch platinum and now Bosch double platinum plugs, and it still has a rougher-than-I'd-like idle. My new water pump helped some. Wish I had seen the FlowKooler at 4wd.com earlier.

If you want peace of mind, take it to a mechanic you trust and have them hook up a diagnostic for $25.