cowman79
Full Access Member
I had a couple of ZD9 plugs go bad last year. I ordered all new glow plugs(ZD9). Installed them, replaced all the bullet ends while I was doing these repairs. I also replaced the glow plug controller at this time. Previous to these glow plugs going bad my truck would start at 10 degrees as soon as the wait to start light went off. Since then when the temperature gets below 40 degrees you have to let the truck keep cycling the glow plugs even after the light has turned off. This morning I went to start the truck when it was 12 degrees and it had been plugged in all night. I waited for the wait to start light to turn off and I had to crank the engine for a long time before it would start. I am at a loss as to what to check next. I had thought about installing the old glow plug relay and seeing how it responded.