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Ford TSB 07-21-2: 4.6L/5.4L/6.8L 2V Spark Plug Thread Repair (1997-2008)
Reference · 1998-2011 Grand MarquisAll 9 manual pages
Technical Service Bulletin intro page covering spark plug thread repair, with reference, application, issue, and action text.
Part of 1998-2011 Mercury Grand Marquis Manual Pages
This document is page one of Ford Technical Service Bulletin 07-21-2, dated October 29, 2007, which supersedes TSB 07-15-2 (August 6, 2007) to update the applicable vehicle model years. The bulletin covers a spark plug thread repair procedure for vehicles equipped with 4.6L 2V, 5.4L 2V, or 6.8L 2V engines with aluminum cylinder heads, and explicitly states the repair is not covered under the new vehicle limited warranty. Applicable vehicles include: Ford 1997 Thunderbird, 1997-2004 Mustang, 1997-2008 Crown Victoria, 1997-1999 F-250 Light Duty, 1997-2004 Expedition, 1997-2008 E-Series and F-150, 1998-2004 F-53 Motorhome Chassis and F-Super Duty, 2001-2005 Excursion, 2002-2006 Explorer; Lincoln 1997-2007 Town Car and 1998-1999 Navigator; and Mercury 1997 Cougar, 1997-2008 Grand Marquis, and 2002-2006 Mountaineer. The stated issue is that some 1997-2008 vehicles with these engines may experience a spark plug port with stripped or missing threads. The action directs technicians to follow the service procedure steps to correct the condition for non-warrantable repairs. The actual step-by-step procedure is not shown on this page and presumably continues on the next page of the set.
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Frequently asked questions
- What is Ford TSB 07-21-2 about?
- It covers a spark plug thread repair procedure for 4.6L 2V, 5.4L 2V, or 6.8L 2V engines with aluminum cylinder heads that may experience a spark plug port with stripped or missing threads. The repair is not covered under the new vehicle limited warranty.
- Which vehicles does this TSB apply to?
- Ford: 1997 Thunderbird; 1997-2004 Mustang; 1997-2008 Crown Victoria; 1997-1999 F-250 Light Duty; 1997-2004 Expedition; 1997-2008 E-Series and F-150; 1998-2004 F-53 Motorhome Chassis and F-Super Duty; 2001-2005 Excursion; 2002-2006 Explorer. Lincoln: 1997-2007 Town Car; 1998-1999 Navigator. Mercury: 1997 Cougar; 1997-2008 Grand Marquis; 2002-2006 Mountaineer.
- Does this TSB cover the 2000 Mercury Grand Marquis?
- Yes. The bulletin lists the 1997-2008 Mercury Grand Marquis among the applicable vehicles.
- Is the spark plug thread repair covered under warranty?
- No. The bulletin title states it is not covered under the new vehicle limited warranty, and the action section refers to correcting the condition for non-warrantable repairs.
- Does this bulletin replace an earlier TSB?
- Yes. TSB 07-21-2 (issued October 29, 2007) supersedes TSB 07-15-2 (issued August 6, 2007) to update the vehicle model years.
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