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2004 - 2008 F150 2004, 2005, 2006, 2007 and 2008 Ford F150's with 5.4 V8, 4.6 V8 or 4.2 V6 engine

which engines have sparkplug thread problems

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  #1  
Old 10-03-2011, 08:54 PM
musstag musstag is offline
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which engines have sparkplug thread problems

I am looking for a used F150 btw yrs 2004 and 2008. Which yrs and which engines have the possible spark plug thread problems? what about trannys, how are they (auto)? I guess I need to b careful of flood vechiles also.
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Old 10-04-2011, 06:33 AM
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As far as the plug issues, all 3v motors are prone to the issue. So that's All 04, 05, 06, and some early 07s before the heads were changed slightly.

Transmissions are hit and miss, mostly for the good though. A decent test drive should alert you to trans issues.
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Old 10-04-2011, 12:49 PM
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Any truck you are looking at you should get a carfax report which would tell you whether or not its a flood vehicle. For the most part these are solid trucks with a few problems but what doesn't.

To break it down even more then what Chandler did the 5.4 from 04-early 07 is the engine with the plug issue. But don't let that scare you off as many will tell you the problem is not as big as what people have made it out to be. Have the lisle tool and they come right out if you break one. The other engines that you could get in these trucks are a 4.6 v8 (nice engine depending on needs my be underpowered) and the 4.2 v6 (underpowered or these trucks in my opinion).
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Old 10-04-2011, 05:45 PM
musstag musstag is offline
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OK! Thanks to you both. Yes that tool is a good deal, I've read about it. I think a 4.8 is about what I need. Towing a boat or 24 ft camper.
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Old 10-04-2011, 07:16 PM
Feedguy Feedguy is offline
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My experience


Having owned a 2004 for a short time, about three months, watch out for this year. I spent 500 $ on a plug change, dealer did it, said they all broke off. 5.4 with 74000 miles. Otherwise nice rig, prefer to drive it over anything else I own.
Did cam phasers also, watch for them. 1200 bucks. Good luck!!
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Old 10-05-2011, 07:51 AM
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FSeriesGuy04 FSeriesGuy04 is offline
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the 1997 - 2003 had issues blowing spark plugs out of the head due to lack of threads in the head itself && the 04 - 08 have the issue where the plug seizes inside the head. I've seen the 9th generation trucks with 280k miles without a problem (routine maintenance). I wouldn't shy away because the plugs break off on removal.
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Old 10-06-2011, 03:07 PM
bondo7 bondo7 is offline
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My truck is a late 07,trouble free.
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Old 10-07-2011, 10:44 PM
jwsrules jwsrules is offline
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Hi past what build date is considered late 2007?
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Old 10-08-2011, 04:35 AM
bondo7 bondo7 is offline
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My build date is 08/07,thats is almost the end of a years run.
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Old 10-08-2011, 03:09 PM
jwsrules jwsrules is offline
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Hi yeah i checked mine and it is 06/07 so pretty late, hope it was updated one.
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