Spark Plug change on 2003 f-150 4.6L 4x4

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#16

02-04-2012, 07:51 PM

Ron W.

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Quote:

Originally Posted by Stewart_H

Incorrect.

All modular engines from97 to '02 were prone to spitting plugs. The 4.6L, the 5.4L, and the 6.8L were all susceptible to launching them into the underside of the hood.

The '03 MY heads were cast with more threads per plug hole, but even they have been know to launch a plug if the plugs weren't installed correctly.

The '03's, due to the more threads per hole, have a larger margin for error.

Stewart

Fixed it for you, late 2002 (October or November?) Ford fully threaded the spark plug holes.

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#17

02-04-2012, 10:50 PM

Stewart_H

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Quote:

Originally Posted by Ron W.

Fixed it for you, late 2002 (October or November?) Ford fully threaded the spark plug holes.

You know what, because the Gen 2 Lightnings first year was '99, over on the L boards, years ago when this became a well known problem, all we ever talked about were the '99 to '02 heads because those years covered out application. So I got in a bad habit of quoting those years.

Thanks for the correction, I edited my post. Reps given!