starting troubles
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Senior User
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starting troubles
I have a 2000 F350 4x4 CC 7.3L It used to start at any temp even 0degrees with out plugging it in. Now it won't start unless its plugged in. I have replaced everything glow plugs, glow plug wiring, relay ICP, IPR ECM. It just won't start unless its been plugged in. Also its seems the wait to start stays on a lot longer than it normally did. I am out of ideas?
Hotshot
Joined: Mar 2014
Posts: 10,750
Likes: 1,065
From: Douglassville, PA
I'd confirm that the glow plug system is actually working. You could have a problem with the ground line to the PCM. When you first turn the key on do you have power on the load side of the relay?
Lead Driver
Joined: Oct 2005
Posts: 6,129
Likes: 1,919
From: Ponca City, OK
When it doesn't want to start is there smoke? If no might be a fuel side problem. No idea why plugging it in would effect that but I've stopped being surprised by the unexplained on these trucks. Is it building hpo like it should?
Cargo Master
Joined: Oct 2007
Posts: 2,712
Likes: 107
From: BoCoMo
The fuel bowl heater should be unplugged at the back of the fuel bowl. In the lower 49 states it is not needed. IF the heater wire brakes, the truck will not start at all because it has shorted out and blew fuse #30. As with plugging in the block heater, this should not be needed unless the temp gets very cold or to help with faster starts.
Cargo Master
Joined: Oct 2007
Posts: 2,712
Likes: 107
From: BoCoMo
I have a 2000 F350 4x4 CC 7.3L It used to start at any temp even 0degrees with out plugging it in. Now it won't start unless its plugged in. I have replaced everything glow plugs, glow plug wiring, relay ICP, IPR ECM. It just won't start unless its been plugged in. Also its seems the wait to start stays on a lot longer than it normally did. I am out of ideas?
Fuel does not get into the cylinder until 'oil pressure' opens the injectors. Thick cold oil may not be opening the injectors up. Plugging the truck in, heats up and thins out the oil and will allow the injectors to open faster.
Also, you can try cycling you glow plug (wait to start) a couple of time to heat the fuel up (if the GPR/plugs are working)
Also, get a 12v meter that plugs into the power port on the dash to see what your electrical voltage is doing.
1) 12.5 key off
2) key on and GPR comes on...11.5v
3) crank starter ..11.v (if the voltage drops below 10.5v, there is not enough voltage to start the truck.
4) once the truck is started the voltage will go up Slowly after the GPR is off and settle at the output of the Alternator....13.5v
5) any large variation in these numbers then something is wrong and needs to be fixed.....
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Papa Smurf
Joined: Nov 2009
Posts: 1,080
Likes: 204
From: Woodstock, GA
Do a Buzz test.... its a 20 year old truck... have you checked the gaps on the injector armature. If gap is to small, the old cold oil is having trouble getting thru.... cranks after being plugged in, as oil is warm...
Just my thoughts... not an expert here
Just my thoughts... not an expert here
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Lead Driver
Joined: Sep 2005
Posts: 9,399
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From: Norco,CA
Have you changed your oil to a thinner grade for the winter?
Fuel does not get into the cylinder until 'oil pressure' opens the injectors. Thick cold oil may not be opening the injectors up. Plugging the truck in, heats up and thins out the oil and will allow the injectors to open faster.
Also, you can try cycling you glow plug (wait to start) a couple of time to heat the fuel up (if the GPR/plugs are working)
Also, get a 12v meter that plugs into the power port on the dash to see what your electrical voltage is doing.
1) 12.5 key off
2) key on and GPR comes on...11.5v
3) crank starter ..11.v (if the voltage drops below 10.5v, there is not enough voltage to start the truck.
4) once the truck is started the voltage will go up Slowly after the GPR is off and settle at the output of the Alternator....13.5v
5) any large variation in these numbers then something is wrong and needs to be fixed.....
Fuel does not get into the cylinder until 'oil pressure' opens the injectors. Thick cold oil may not be opening the injectors up. Plugging the truck in, heats up and thins out the oil and will allow the injectors to open faster.
Also, you can try cycling you glow plug (wait to start) a couple of time to heat the fuel up (if the GPR/plugs are working)
Also, get a 12v meter that plugs into the power port on the dash to see what your electrical voltage is doing.
1) 12.5 key off
2) key on and GPR comes on...11.5v
3) crank starter ..11.v (if the voltage drops below 10.5v, there is not enough voltage to start the truck.
4) once the truck is started the voltage will go up Slowly after the GPR is off and settle at the output of the Alternator....13.5v
5) any large variation in these numbers then something is wrong and needs to be fixed.....
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