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  #16  
Old 10-08-2010, 12:48 PM
DrIftKi7Vg DrIftKi7Vg is offline
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Default Re: 4.0 V6 misfire

Quote:
Originally Posted by MAK View Post
Jordan, I kept cracking the #4 plug and couldn't figure out why. As it all turned out I bet the cracked head was the reason I kept cracking the porcelain insulator on the plug in that one cylinder. I'm not an expert but I'll bet money on this.
Well could be. That and mine is a 3.0 so that could be your problem, I would get it checked out by the mechanic if you don't know how to fix it yourself...

Quote:
Originally Posted by naturecakezzz View Post
I had this exact problemi replaced plug after plug and it kept on fouling in a few months.. honestly I hate to sound like a salesman but I changed the oil and dumped in that z max stuff... no more miss I have done countless oil changes and added z max every 6000 miles since then
That stuff is expensive! Well I mean it takes a chunk of money away from you... How does it work overall? What size engine do you have and miles? I would really like to do this at my next oil change which is coming up in I think 80 more miles
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  #17  
Old 10-09-2010, 08:20 AM
94Ranger4x4 94Ranger4x4 is offline
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Default Re: 4.0 V6 misfire

yeah..update on this problem, i had to replace my heads as well. i was leaving work about 3 weeks ago, and what looked like a blown head gasket, so i had it towed home i took it apart thinking just a gasket problem...i was wrong the gasket was fine, so i inspected further and found cracks right between the exh/int. valves on 3 cylinders, sincc then i have brand new heads and she's running great and doesnt skip a beat, i travel for my drill weekends and i got about 27 mpg....if you have these symptoms it can be very hard to diagnose...good luck to all..and thanks for all the help.
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  #18  
Old 10-09-2010, 10:22 AM
sgtsandman sgtsandman is offline
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Default Re: 4.0 V6 misfire

Cracks in the head! Not good! Glad you got it fixed. Drill weekend? Are you National Guard then?
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  #19  
Old 10-09-2010, 10:33 AM
94Ranger4x4 94Ranger4x4 is offline
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Default Re: 4.0 V6 misfire

no..im Marine Corps reserve... but i due contract security work for the Rhode Island national guard.
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  #20  
Old 10-09-2010, 10:48 AM
sgtsandman sgtsandman is offline
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Default Re: 4.0 V6 misfire

Ah ok. My brother was in the Marine Reserves, I'm Air National Guard.

Thank you for your service.
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  #21  
Old 10-12-2010, 04:47 AM
MAK MAK is offline
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Default Re: 4.0 V6 misfire

The crack in my head 4.0 was in the exact same area, right between the vlv's. When I took my heads to the machine shop the guys there didn't even look for 30 seconds and said I can see one problem already and pointed out the crack. Apparently this is a typical place for these heads to crack. To answer Jgarner3189 with his question of how much would a vlv job cost; The machine shop I took my heads to was going to charge me $350 to do a complete rework of my heads but when he found the crack and said for $100 more ($450) he could get me two new heads I elected for the new (vlv's and all installed). If you are going to have a shop (not Ford dealer) do the entire job you are probably going to spend at least $2500 depending on who you take it to of course.
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