2001 7.3 start problems

[haulin5er]

Has anyone experienced my start problem?
Not much of a problem but truck starts after WTS light goes off but in order for it to keep running I have to give it throttle. I don't like to rev it up until it warms up but it will stop if I don't throttle it.
Bob

[bigcountrysg]

Originally Posted by haulin5er

Has anyone experienced my start problem?
Not much of a problem but truck starts after WTS light goes off but in order for it to keep running I have to give it throttle. I don't like to rev it up until it warms up but it will stop if I don't throttle it.
Bob

Might be the cps going bad. Might be your glow plugs going bad. Could be the glowplug relay going out. Might be the fuel bowl heater going bad. Could be the hpop getting weak and not able to build up ample oil pressure unless you rev it up a bit.

I would start by checking the cps (cam postitioning sensor) it is located on the front of the engine passenger side between the water pump and crank pulley at about 1 O'clock as you look at it from the ground up. There is a little metal tab that sticks out towards the front of the truck. It is held in by a 10 mm bolt has one wire connection to it. The CPS is about 120 bucks at a dealership but you can get them from ebay for about 75 bucks.

If it is your glowplugs not getting hot enough or becoming weak then you would have to pull the valve covers off to replace them.

If it is the glow plug relay you can check it with a multimeter. You are going to check for voltage at the gpr you want to know the voltage going in and coming out of the gpr.

Another thing to check is the connections at the UVC ( under valve cover wiring harness) you can check the connection at the valve cover if it is good then the wiring harness might be melted under the valve cover and needs to be repaired or replace. If it is this wiring harness since you have the valve cover off you might as well replace the glowplugs. This wiring harness is known to melt and short out.

Lets start with those items first as those are the simpliest to repair. Let us know what you find out during your trouble shooting.

Side note, there really is no way to diagnose the cps other then swapping it out. If that does not solve the problem it is advised that you keep the spare cps in your glove box with a the tools to replace it as they are a common problem in the 7.3L and they usually give no warning before failure.

[haulin5er]

bigcountrysg,
Thanks for the help, I have a spare CPS, do you think I should install it ??
Do you think that is what the problem is ???? In the morning, when I start it, if I don't give it throttle, it will stop. I can restart it right away and it will run.
I hate to use my CPS if that's not it. This is a problem I can live with but the fact that it's not right bothers me.