I just went through the SAME exact thing with a P0676 code too!
I replaced EVERYTHING starting from the Valve cover gasket (has an electrical connector built in it) That did not fix it, then I replaced the wiring harness under the valve cover, that did not fix it. Then all 4 of the glow plugs on the drives side, that did not fix it. Finally replaced the glow plug control module.......that did fix it!
Lots of time and money! But better than getting taken by the stealership!
If the problem only comes back in the morning when you start it up,
then you clear it with the superchips programmer, and does NOT come back untill the engine has totally cooled down and restarted.......
You might want to replace the GPCM first!
Even the dealer tech called Ford.......and they told him to replace the glow plug..... [img]/ubbthreads/images/graemlins/eek.gif[/img]
Same 2000 Excursion....with the same Isspro pillar mounted guages and the same Superchips programmer!! Too WEIRD!!!
P.S. sometimes I had to clear that P0676 code 4-5 times to really get it out of there, after you clear it out....go right back in there and read the DTC's again to see if it really cleared it out of there.
For some reason it wont always clear it out on the first, second or even third try...... [img]/ubbthreads/images/graemlins/shrug.gif[/img]
Click on this and read all the posts I had about it!