Glow Plug Timing
Lead Driver
Joined: Jul 2017
Posts: 6,860
Likes: 2,335
From: WV
So you’re seeing a consistent 45 second delay between key on and voltage drop?
My understanding is that the PCM controls the
GPR through the small ground wire on the relay as the trigger.
I would remove the ground and test it (positive battery to ground wire) to see if the delay is coming from the PCM. That takes the mechanical aspect of the GPR out of the equation.
Next I would pull the small positive wire from the GPR and make sure it’s always hot when key on (I think that’s the case for that wire).
My understanding is that the PCM controls the
GPR through the small ground wire on the relay as the trigger.
I would remove the ground and test it (positive battery to ground wire) to see if the delay is coming from the PCM. That takes the mechanical aspect of the GPR out of the equation.
Next I would pull the small positive wire from the GPR and make sure it’s always hot when key on (I think that’s the case for that wire).
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Tuned
Joined: Apr 2004
Posts: 433
Likes: 74
From: Aroostook County, Maine
It will be a few days before I'm back home, but by then I think my window of cold temps for testing will have closed.
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