Spark Plug Change
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Spark Plug Change
Hi Guys,
next weekend i will have to change my spark plugs and coils on my 2003 F150 Harley Davidson.
I searched and read a lot and found different informations.
An especially Information in this forum was this:
"Plugs were getting blown out on the old NON-PI heads, specifically on the Lightning. Under boost, the plugs were pulling the threads out of the heads. In 97, 98, and early production 99 heads, they only had 4 threads. From late 99 until the 3-valve came out, the PI heads have 8."
So is it right that my 2003 F150 doesnt have the Problem with spark plugs blowing out cause it has almost 8 threads?
Next question is about the torque, some people say 14 lb/ft, other say 28-32 lb/ft, what is right
Hope here are specialist that can answer me both questions.
Best regards
Sebastian
next weekend i will have to change my spark plugs and coils on my 2003 F150 Harley Davidson.
I searched and read a lot and found different informations.
An especially Information in this forum was this:
"Plugs were getting blown out on the old NON-PI heads, specifically on the Lightning. Under boost, the plugs were pulling the threads out of the heads. In 97, 98, and early production 99 heads, they only had 4 threads. From late 99 until the 3-valve came out, the PI heads have 8."
So is it right that my 2003 F150 doesnt have the Problem with spark plugs blowing out cause it has almost 8 threads?
Next question is about the torque, some people say 14 lb/ft, other say 28-32 lb/ft, what is right
Hope here are specialist that can answer me both questions.
Best regards
Sebastian
Super Moderator
Joined: May 2004
Posts: 29,380
Likes: 118
From: Central Coast of CA
I searched and read a lot and found different informations. An especially Information in this forum was this:
"Plugs were getting blown out on the old NON-PI heads, specifically on the Lightning. Under boost, the plugs were pulling the threads out of the heads. In 97, 98, and early production 99 heads, they only had 4 threads. From late 99 until the 3-valve came out, the PI heads have 8."
"Plugs were getting blown out on the old NON-PI heads, specifically on the Lightning. Under boost, the plugs were pulling the threads out of the heads. In 97, 98, and early production 99 heads, they only had 4 threads. From late 99 until the 3-valve came out, the PI heads have 8."
The problem was not especially endemic to the Lightning, and being supercharged (boost) didn't exacerbate the problem for Lightning owners.
The 4 threads per spark plug hole was a problem for all Ford Modular engines up to the end of the 2002 MY run, and in some cases, into the 2003 MY run, depending on how many heads were left for each size modular engine block when Ford upgraded the spark plug threads.
Sometime near the end of the 2002 Model Year run for the 4.6L, 5.4L, and 6.8L modular engines, and in some cases into the 2003 Model Year run, Ford started using upgraded heads with more threads per hole.
So is it right that my 2003 F150 doesnt have the Problem with spark plugs blowing out cause it has almost 8 threads?
Next question is about the torque, some people say 14 lb/ft, other say 28-32 lb/ft, what is right
Stewart
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