where does the gpr get its hold signal from? the truck starts great even at 20 deg out. but 30 seconds after starting the gpr releases and the truck smokes terrible until warmed up. tis the season for gpr's and smoke i guess

 

GPR should stay on for 2 minutes at that temp.

Do you see the voltage gauge on the dash change?

The computer checks the engine oil temp sensor and adjusts accordingly to determine GPR on time and WTS time.

(I typed coolant temp like an idiot, thanks mike)

 

PCM uses EOT for gpr time.

 

Crap, thats what I meant. thanks.

 

that makes good sense. thanks guys now i can chase down a few other leads. reps sent