Here you are 44 bucks this is where I got mine a year ago

586-902 Stancor General Purpose / Industrial Relays

OOooo! Now this is interesting. Can someone post a pic of this relay board, or whatever you call it? I am having cold start problems too. I would gladly replace both relays if I knew what to look for. Mine starts great in the warm weather, but sucks in the cold. I also get plenty of white smoke when cranking too.

THANKS!!:tu:

just look on top of the motor on the passenger side, you will see 2 relays, they look just like ford starter solenoid, i BELIEVE the one you want to change is the rear (i could be wrong tho), and make sure you get the glow plug relay or you could burn your computer up,

Your Excursion does not have a GPR... It has a Glow Plug Control Module... Its fancy... and expensive, and breaks all the damn time! On my 4th one for the wifes Excursion!

Okay so anyone have a P/N and/or a procedure for testing this? I don't show any codes and my curly cue glow plug light comes on the way it should. I can also hear (what I think is) the cold air warmer fire off. It makes that whoooosh sound.

I would gladly replace the GPCM if I could verify it's malfunction.

Ideas?

Glow plug light means squat, its an idiot light...

You can not hear the intake air heater, more then likely you are hearing a vacumn pump, and the intake air heater has nothing to do with cold starts, infact it does not even come on during cold starts.

What are you using to look for codes? If your GPCM is out, you will have a code for it.

I have a generic SES scanner just to read codes I bought at Pep Boys. It clears my PO238 I get when in over boost, but that's another story.

Really? about the glow plug light? I have seen that stay on once in a while too, until I key off and re start. That's rare though.

As for the whooosh, what is that then????? Wouldn't that be the best time for that heater to come on -- cold starts??? I am really confused now.:humm:

I paid the same, nothing near $100

Doubtful it will read diesel codes, and not in depth at all...

yup, nothing more then a glorified idiot light... Watch this video that shows how long the glow plugs stay on after the WTS or light goes off. This is on a warm motor too.




The intake air heater was added in late 99 for nothing more then white smoke when sitting at extended idle. It has NOTHING to do with cold starts. It will not come on unless the parking brake is set, truck is in Park and the oil temp is above a set point...

Well I will stick to my GPR109 for 24.98... Same one for 3 years now...:tu: