I have a 91 f350 wheeld coach ambulance with 74,000 miles. since it has gotten cold, it has become very hard to start, and seems to be because the glow plugs don't stay on long enough.
when you turn on the key (it is 4 degrees F this morning) the "wait to start" only comes on for 1-2 seconds. I had to cycle the key about 20 times to get it to start.
Went to the doctor, was in about 20 mins, come out to a truck that is still very warm, "wait to start" comes on for 7-8 seconds, not 1-2 as i would expect on a warm engine.
why is the glow plug relay acting exactly the opposite of what I need it to do???
I got the GlowPlugRelay diagram that Bill1013 posted in the thread http://www.thedieselstop.com/forums/...-relay-398761/
Great diagram, thanks Bill! it says in the text of the diagram:
"the solid state system determines the glow plug temperature by electronically measuring the resistance of the glow plugs and maintains temperature regardless of ambient temperature."
Well, that's nice and all, but what makes the controller think my GPs are hot when they are cold and vice-versa?
PS - I also have a 86 f250 that I bypassed the manifold threaded glow plug controller with a momentary on switch because i got tired of it not staying on long enough.
PPS - I also have a 94 E-350 that I bypassed the electronic gel encased glow plug controller because I got tired of it not staying on long enough!
I could do that (again), but I'd like to think that at some time, this system actually worked properly and could do so again. If it will continue to be an unreliable pain, say so and I'll go get another momentary switch and some wire.
when you turn on the key (it is 4 degrees F this morning) the "wait to start" only comes on for 1-2 seconds. I had to cycle the key about 20 times to get it to start.
Went to the doctor, was in about 20 mins, come out to a truck that is still very warm, "wait to start" comes on for 7-8 seconds, not 1-2 as i would expect on a warm engine.
why is the glow plug relay acting exactly the opposite of what I need it to do???
I got the GlowPlugRelay diagram that Bill1013 posted in the thread http://www.thedieselstop.com/forums/...-relay-398761/
Great diagram, thanks Bill! it says in the text of the diagram:
"the solid state system determines the glow plug temperature by electronically measuring the resistance of the glow plugs and maintains temperature regardless of ambient temperature."
Well, that's nice and all, but what makes the controller think my GPs are hot when they are cold and vice-versa?
PS - I also have a 86 f250 that I bypassed the manifold threaded glow plug controller with a momentary on switch because i got tired of it not staying on long enough.
PPS - I also have a 94 E-350 that I bypassed the electronic gel encased glow plug controller because I got tired of it not staying on long enough!
I could do that (again), but I'd like to think that at some time, this system actually worked properly and could do so again. If it will continue to be an unreliable pain, say so and I'll go get another momentary switch and some wire.