Another no start
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New User
Joined: Mar 2004
Posts: 18
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From: Anchorage
Another no start
Hi everyone. I am fighting a crank no start on my 2001 Power stroke. It used to start fine if it was plugged in for about 2 hours and as it got colder (single digits and below) this stopped helping. I went out yesterday to work on it and I found the GPR had 10.5 volts on the output side when key is on. and the glow plugs read to a ohm each. I was only able to test the passenger side because of time and coldness (about -10). I also hooked up my inductive ammeter and found that the glow plugs when switched on were pulling a max of 100 amps and after about 20 seconds they pulled about 75 amps. My simple Ohms law tells me that at 1 ohm they should pull about 126 amps at a battery resting voltage of 12.6. Is any of this an indicator of a faulty glow plug system?? Any other checks you guys reccomend?? Thanks.
Post Fiend
Joined: Nov 2007
Posts: 9,549
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From: Payson, AZ
What voltage do you see at the always hot GPR terminal?
If you are only seeing 10.5 volts with key on then when you go to start the voltage will fall below the 10.5 required for the IDM to operate the injector solenoids and that will cause a no start. You need 10.5 volts WHILE cranking.
If you are only seeing 10.5 volts with key on then when you go to start the voltage will fall below the 10.5 required for the IDM to operate the injector solenoids and that will cause a no start. You need 10.5 volts WHILE cranking.
Thread Starter
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New User
Joined: Mar 2004
Posts: 18
Likes: 0
From: Anchorage
What voltage do you see at the always hot GPR terminal?
If you are only seeing 10.5 volts with key on then when you go to start the voltage will fall below the 10.5 required for the IDM to operate the injector solenoids and that will cause a no start. You need 10.5 volts WHILE cranking.
If you are only seeing 10.5 volts with key on then when you go to start the voltage will fall below the 10.5 required for the IDM to operate the injector solenoids and that will cause a no start. You need 10.5 volts WHILE cranking.
I didn't check cranking voltage at the batteries. Obviously if the glow plugs pull them down to 10.5 then there isn't much left for everything else. I need to look at that. I didn't think much about it cause I replaced the batteries in September in preparation for winter and I charged them before I tested these things.
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