Thanks to everyone here that's willing to help others out with troubleshooting. I've read dozens of posts regarding gps and all were valuable to me. I get Wait To Start for 4 seconds and billows of white smoke upon starting. 9+ volts and increasing to the glow plugs before the controller trips off. I'm going to buy 8 new gps (Motorcraft ONLY) this week.

Thanks again for sharing your knowledge!

Weedhopper

 

Be VERY cautious as to the removal of what is in there now......
if they are unknown to you what brand:

Ensure the cylinder you are working on is at TDC...... this will retain the broken off tip in the pre combustion chamber until you can remove it. Special procedure so ask for help should it happen. The below info will allow you rotate the engine by hand to TDC of the cylinders.

The timing mark is found on a little plate that is on the front of the engine on the passenger side. The plate is mounted so it is very close to the main pulley on the lower front of the engine which is mounted on the vibration damper. On the side of the vibration damper, is a line, which when lined up with the line marked (O) on the plate, tells you that the #1 piston is at TDC(top dead center) You can see the line on the damper, and it points to the line on the plate with the (barely visible)O mark on it.You'll have to find a way to turn your engine over by hand (Crank/harmonic balancer bolt). Make sure you remove the power wire to the injection pump(so the engine won't start)and then rotate the engine until you can line up the marks.

The engine rotates in a clockwise direction as seen from the front of the truck, and for every 1/4 turn of the engine(crank) each next piston will arrive at TDC. So, When the line on the vibration damper is at the 2 oclock position, cylinders 2 and 5 will be at TDC. When the mark is at the 5 oclock position, cylinders 7 and 6 will be at TDC, 8 oclock has cylinders 3 and 8 at TDC, and back to 11oclock, 1 and 4 will be at TDC.

Cylinder numbers are assigned 1,3,5,7 on the right (passenger USA) bank from front of truck to back, and 2,4,6,8 on the driver's side (USA), front to back. Firing order is 1,2,7,3,4,5,6,8.

 

Thanks for the advice! I can see where this could save a guy from having to pull a head to retrieve broken GP parts. I guess it's best to ease the GPs out of the engine as they could be expanded and fragile.

Thanks again.