William
It wasn't till the 97's that temperatures mattered for glow plug run times. I lived in AZ for 18 years and this is the 1st real winter that my truck has ever seen. On a 96 the PCM activates the glow plugs for just over 90 seconds no matter what. Even with temps over 100 if you shut the truck off and restart it the glow plugs will go thru the complete cycle.

 

X2. My GPR is the stock (brown) unit. I've had my truck for six years now and she just started giving me trouble in the mornings. I think it might the GPs because I get a LOT of white smoke and hafta keep on cranking her if I don't have her plugged in before trying to start her.

 

you saying that in 97 they started putting a temp sensor in the block to stop the glow plugs?

 

No. Even the early PSD had temp sensors, EOT (engine oil temperature) and IAT (intake air temperature) but the PCM didn't use that info to control the glow plug run time.

 

Learn something every day .....

 

Rick likes it!

 

i replaced the gp's and the relay it still seems to struggle when starting? Yes is gets cold here i live at about 7300 Ft.

 

Just replaced mine as well (2nd burn out on the stock in 2 years!) 20 minute job, works great