Cylinder 7 glow plug failure code

[DmaxMaverick]

Thanks for your reply. I'll only replace number four. But to be certain, number four is on the passenger side rear yes?

Nope. Maybe on a Ford. 1, 3, 5, 7 on the passenger side. 2, 4, 6, 8 on the driver's side. #4 is the second hole from the front, on the driver side. All GM engines are simple. The cylinders are numbered according to their position on the crank, #1 at the front. Most Fords are numbered by bank, and Chryslers depend on the year, weather, wind, and current CEO's secretary's brassiere size.