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Jeep in trouble


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slasher448
New User

Mar 20, 2010, 5:28 PM

Post #1 of 3 (1396 views)
Jeep in trouble Sign In

I replaced spark plugs on an inline 6 4.0 jeep, and cleaned the throttlebody with a rag and cleaner. Now it has really bad idle and stumbles like its misfireing. but when i accelerate over like 2500 rpm it mostly goes away


Sidom
Veteran / Moderator
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Mar 20, 2010, 9:19 PM

Post #2 of 3 (1392 views)
Re: Jeep in trouble Sign In

If the miss wasn't there before the plug change, the 1st thing I would check would be the firing order. It should be 1 5 3 6 2 4 with a clockwise rotation.


steve01832
Veteran
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Mar 21, 2010, 4:33 AM

Post #3 of 3 (1390 views)
Re: Jeep in trouble Sign In

Firing order is a great place to start. Also, did you gap the plugs before install? Also, if there is a lot of sludge around the plugs, it is possible that one plug air gap got filled with sludge preventing spark from arcing across the electrodes?

Steve






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