Compression Ignition Addict
Join Date: Apr 2007
Thanked 241 Times in 223 Posts
Mentioned: 75 Post(s)
Quoted: 324 Post(s)
Feedback Score: 0 reviews
There is a GPCM orientation change in 04 AFTER the 9-22-03 ICP (high pressure oil rail) changes:
Look at your ICP sensor on the passenger side valve cover. Pay attention to how the GPCM is bolted up to the bracket that secures to the valve cover. If you happen to have it secured in a manner similar to a 2003 engine (HORIZONTAL ORIENTATION), you have a mid/late build 2004 engine. As such, your engine uses engine harness Ford part number 4C3Z-12B637-AA (Navistar ID# 1844262C93), to be used with glow plug harnesses part numbers 4C3Z-12A690-AA (Navistar ID# 1845915C9) right side, and 4C3Z-12A690-BA (Navistar ID# 1845793C9) left side.
If you have your GPCM mounted on the bracket, identically to the way it is on 2005 and later engines (VERTICAL ORIENTATION), you have a late/late build 2004 engine. As such, your engine use engine harness Ford part number 4C3Z-12B637-CA (Navistar ID# 1846377C92), and glow plug harness Ford part numbers 4C2Z-12A690-AB (Navistar ID# 1845794 C9) right side, and 4C2Z-12A690-BA (Navistar ID# 1845695 C9). Notice, the right side glow plug harness part number is also identical to that, that is used on '05 and later engines.