Cold No Start
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Elder User
Joined: May 2009
Posts: 514
Likes: 3
From: Long Island
Cold No Start
Have a new to me 2000 excursion that won't start cold. Tested all the glow plugs at the harness and all are .7 to .9 ohms. With the key off glow plug relay has 12v on the supply side, .7V on the small terminal on Radiator side, .7V on small terminal on back side, and 0V on the large terminal for the glow plugs. KOEO 12V on supply side, 12V on the small terminal on Radiator side, 12V on small terminal on back side, and 0V on the large terminal for the glow plugs. Tried a new relay and same readings. Removed ground trigger wire from small terminal on back side of the GPR KOEO and grounded the terminal. Relay clicked and measured 10.5V on large terminal for glow plugs while supply side maintained 12V. Can one of you give me some direction? I have an 06' 6.0 and know that motor pretty well but new to the 7.3.
Thank you
Thank you
Hotshot
Joined: Mar 2014
Posts: 10,750
Likes: 1,065
From: Douglassville, PA
The GPR is activated with a ground to the PCM when the PCM calls for glow plugs to activate. Oh, wait a minute...doesn't your Ex have a glow plug control module? (GPCM)? You might be checking your AIH relay.
Fleet Mechanic
Joined: Jul 2010
Posts: 1,753
Likes: 34
From: Los Angeles, Ca.
Is this a recurring problem? Always have cold start issues or just suddenly wouldn't start? If injector wear is the cause you should have experienced cold starting/running problems for a while, if it's always been good and suddenly won't start it's not injector wear. Knowing these things will rule out injectors and help get on the path to finding the problem. Also verify that the THEFT light goes out when the key is turned on, if it's flashing there's a PATS problem causing the no start.
Post Fiend
Joined: Mar 2002
Posts: 19,402
Likes: 38
From: Bonita Springs FL
Some early 2000 Excursions have a GPR. I don't know what the cutoff is but you could have either. The first thing to look at is whether you have two GPR-looking things on top of the engine or one GPR-looking thing and a silver, finned box with two plugs coming out of the valley side of it. That's a GPCM and you first need to determine which setup you have.
+1 on the thinner oil in the winter. I use 5w40 year round.
+1 on the thinner oil in the winter. I use 5w40 year round.
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