SW86 Posted May 23, 2011 Share Posted May 23, 2011 after i drive my MJ, even if its not all the way warmed up, there will always be smoke in my valve cover. if it gets up to operating temps, theres more but its always consistant everytime. no more, no less smoke. is this just something these older 4.0s do or is there a problem a foot? oil pressure seems good to go for 10w40 oil. do any of your MJs do this also? thanks Link to comment Share on other sites More sharing options...
JeffN Posted May 23, 2011 Share Posted May 23, 2011 common for a vehicle without a true pcv system Link to comment Share on other sites More sharing options...
jimoshel Posted May 23, 2011 Share Posted May 23, 2011 Ring blow by. Worn piston rings. and or leaky valve guides. If your not using any oil, don't worry about it. Even perfect fitting parts will leave a little oil on cylinder walls to burn and show smoke. Link to comment Share on other sites More sharing options...
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