after my dads early 99 had been plugged in all night it was still starting up really rough, we took it to the mechanic to see if the heater plug was bad. we found out that the plug had been plumbed in right above the oil filter to heat the oil. has anyone else ran into a truck with this or does anyone know anything about it?

 

my truck is the same way and it starts hard as hell. the shop said the glow plugs were good so dose where the heater is have something to do with it????

 

Thats where it is installed at the factory. Good to see that its there.




Right above the oil filter in this picture.

How did they check the glow plugs? Did they check the glow plug relay?

Unless its below 25-30 degrees these trucks should start up on the first try without being plugged in.