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racorcey
05-23-2014, 10:53 AM
I happened to see this in this month's issue (May, 2014) under Service Slants. Veddy interesting:

Ford

No power, rough running, MIL illuminated with misfire DTC(s) stored. Owners of some 1999-2005 Ford-built cars and light trucks with the 4.6 or 5.4L four-valve engine may come into your shop with complaints that their engine is down on power, runs rough or misfires while driving on the open road.
According to Ford, the driveability symptoms are most common on vehicles built before 12/19/04, will typically be accompanied by an illuminated MIL and will store DTCs P0301 through P0308 and/or P0316 in the PCM. One likely cause, says the carmaker, is gas leakage past the exhaust valves. Installing an improved cylinder head on the affected bank is the recommended fix.
To make an accurate diagnosis, perform a relative compression test on all cylinders. If any show low compression, do a cylinder leakage check while listening for a hissing noise from the exhaust pipe. If you hear the hiss, replace the affected cylinder head with the upgraded unit.
Vehicles that are prone to the issues mentioned are 1999-2004 Lincoln Navigators, 2002-03 Lincoln Blackwoods, 2003-04 Ford Mustangs and Mercury Marauders and 2003-05 Lincoln Aviators. Here are the part numbers for the replacement cylinder heads:
Engine, Cylinder Head Part No.
4.6L, Left . . . . . . . . . . 2C5Z-6049-BAB
4.6L, Right . . . . . . . . . 2C5Z-6049-CAB
5.4L, Left . . . . . . . . . . YL7Z-6049-EA
5.4L, Right . . . . . . . . . YL7Z-6049-FA
Note: Although the cylinder leakage can occur on either bank, Ford says it’s much more common on the left-hand cylinder head. When installing the updated head(s) also replace the timing chain tensioner and pipe plugs.

I wonder if anyone got stuck having to do this to their car yet?

jwibbity
05-23-2014, 11:22 AM
Ford is finally addressing their ****!!!!!:banana2::banana2:

TAKEDOWN
05-24-2014, 09:29 PM
Jeez... that's important!

stevengerard
05-26-2014, 08:08 AM
this isn't a warranty or recall though is it?

geo815
05-26-2014, 08:12 AM
The more I read about the 4v 4.6 engine, the easier it is to justify a 5.0 Coyote.

racorcey
05-26-2014, 11:58 AM
this isn't a warranty or recall though is it?

Steven - are you friggin' kidding? None of the above. They probably had all this service data in their records for nearly the last 10 years, and decided that they didn't want to get "GM'd" by the fed, so, knowing there probably wasn't a safety or warranty issue, decided to "come clean." What I didn't bother to mention earlier, was that Ford released dozens of items like this across their product lines in the last couple of months. I've never seen so many from Ford before in so short a time. I only posted this one because it had some relevance to our cars.

lifespeed
05-26-2014, 08:07 PM
Steven - are you friggin' kidding? None of the above. They probably had all this service data in their records for nearly the last 10 years, and decided that they didn't want to get "GM'd" by the fed, so, knowing there probably wasn't a safety or warranty issue, decided to "come clean." What I didn't bother to mention earlier, was that Ford released dozens of items like this across their product lines in the last couple of months. I've never seen so many from Ford before in so short a time. I only posted this one because it had some relevance to our cars.

Interesting post. I think there has been some realization in the community these engines sometimes have valve and seat problems. I agree the timing of the release of information is an odd coincidence.