Posted by W_B on January 20, 2015 at 07:47:45 from (155.188.123.25):
In Reply to: 1999 f150 posted by Texasmark1 on January 18, 2015 at 19:20:36:
Quoting Removed, click Modern View to see
Sorry, WRONG! All the early 5.4 Tritons had issues with launching the plugs due to few threads holding the plugs in aluminum heads. The steel plugs will wear the threads in the head if not kept very tight and will blow out and probably take the coil pack with it. Happened to my 2000 Expedition Eddie Bauer, to the hardest one to get to of course. The Ford forums are full of cases of this. The fix with new plug and coil pack was under $500, at a dealer about 5 yrs. ago. If you can put in a heliccoil yourself it will be less than that. Word is the heli coil may not hold but if done right it's OK. I understand too that a different plug and a head redesign were done in the later models and have been very good engines.
Other than this one issue my Expedition has had no problems with the engine itself or drivetrain.
Lots of other issues due to corrosion and age (146,000 plus miles so far) but nothing really major. Just replaced the ABS brake controller and brake lines to the master cyl.... leakage due to corrosion. BTW, those brake lines I mentioned are limited availability, as in only one, the "primary" (there is a braided section in the middle of them) and are no longer made as replacement parts. Had to make the other myself out of solid brake line.
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