Question about 2006 Ford F-250 Super Duty

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Ok i have a 2004 ford f350 superduty 6.0 i have changed ficm crankshaft position sensor in it it has 1684 lbs of oil pressure. I dont understand why it want start could it be a fuel pump ive changed the fiters is there another sensor that could be bad or a fuse to check. It ran fine drove it home one night got up next day it would try to start but just never would fire up?

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Are your glowplugs cycling? You have both a Timer and a Relay on the starting circuit for the glowplugs. The engine is 100% dependent on having the glowplugs work for a cold start.

Use a test light or voltmeter and test a few glowplug wires to see if they are getting fire. If they are not getting fire, work your way along the firewall from the glowplug wires and check for power coming out of the Timer box and for power going into the Timer box. If you have no power going into the Timer box, then follow the wires to the Relay box and check for power there. Keep going until you find out where you are losing power.

Now if you have power at the glowplugs, then remove a few and test them for fouling. You can melt them, but using jumper cables you can provide power and see if they glow. Remember the glowplugs only get pulses of power and that is all they have to work with. So a glowplug that remains dark, or is slow to glow is not doing you any good.

If there is an access point to observe the timing chain or valve rocker moving, it would be good since you already put in a crankshaft sensor. Some of the sensors are adjustable and the engine may just be out of time.

If you are getting pressure the pump should be working, I am not certain about the recommended PSI, kinda thought it was higher, but it should start with what you have if you are talking fuel pressure.

Did you prime the new fuel filter with diesel? You may need to pressure check the lines from the filters to the tanks to see if an animal chewed a rubber line.

I would appreciate a note on what you finally discovered and I hope my solution is very helpful to you.

Posted on May 18, 2011


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