2V V10 changes
Posting Guru
Joined: Apr 2006
Posts: 2,216
Likes: 7
Anything I should be worried about on my 99'?
Logistics Pro
Joined: Aug 2007
Posts: 3,974
Likes: 18
From: Millersburg, OH
No. They are not the "PI" (performance improved) version but other then not producing as much power they are not any worse.
Senior User
Joined: Aug 2007
Posts: 141
Likes: 1
They are prone to pop plugs as are some of the PI heads, not to mention nearly 50hp and 20ft.lbs less torque.
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FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 423
From: Long Island USA
For the spark plug thread issues:
December 1996 - 4.6L 4V alignment feature added
February 1997 - 4.6L 2V head alignment feature added
September 2000 - WEP (Windsor Engine Plant) 2V head alignment feature modified (4.6/5.4/6.8)
November 2002 - WEP introduced long thread heads on 2V (all)
May 2003 - REP (Romeo Engine Plant) introduced long-thread heads on 4V 4.6 and 5.4
November 2003 - REP introduced long-thread heads on 2V and modified alignment feature
In 1999, and 2001, an interim fix was done for a cross-threading issue.
Original process:
Step 1 - Zero torque spark plug (air tool)
Step 2 - Torque to 16-20Nm final torque (DC Run down), monitor at 6-12Nm, and final torque must be reached within 0-360 degrees.
New process (addressed the possibility of applying installation torque for more than 25 degrees of rotation)
Step 1 - Zero torque spark plug (air tool)
Step 2 - Torque to 16-20Nm final torque (DC Run down) start monitor at 6-12Nm, and final torque must be reached within 3-25 degrees.
Another action to address cross-threading was the addition of an alignment feature to lead the plug into the hole.
December 1996 - 4.6L 4V alignment feature added
February 1997 - 4.6L 2V head alignment feature added
September 2000 - WEP (Windsor Engine Plant) 2V head alignment feature modified (4.6/5.4/6.8)
November 2002 - WEP introduced long thread heads on 2V (all)
May 2003 - REP (Romeo Engine Plant) introduced long-thread heads on 4V 4.6 and 5.4
November 2003 - REP introduced long-thread heads on 2V and modified alignment feature
In 1999, and 2001, an interim fix was done for a cross-threading issue.
Original process:
Step 1 - Zero torque spark plug (air tool)
Step 2 - Torque to 16-20Nm final torque (DC Run down), monitor at 6-12Nm, and final torque must be reached within 0-360 degrees.
New process (addressed the possibility of applying installation torque for more than 25 degrees of rotation)
Step 1 - Zero torque spark plug (air tool)
Step 2 - Torque to 16-20Nm final torque (DC Run down) start monitor at 6-12Nm, and final torque must be reached within 3-25 degrees.
Another action to address cross-threading was the addition of an alignment feature to lead the plug into the hole.
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