7.3 won't start - Ford Powerstroke Diesel Forum
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Old 11-20-2012, 03:00 PM
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7.3 won't start

help???? got a 2000 f 250 i just replaced glow plugs now the truck won't start any help would be great.
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Old 11-20-2012, 03:16 PM
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You're a little light on info though

WTS Light? - do you get it when you first roll-on the key?

Tach Movement? - does the tach needle move up slightly when cranking?

Fuel - pump runs? Fuel refilling filter housing? Tank below 1/4?

Is it cranking fast enough? - it won't even TRY to start if cranking really slowly.

Is your truck "chipped"? If so, remove it as a Test.
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Old 11-20-2012, 03:39 PM
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Quote:
Originally Posted by NoRalPh View Post
You're a little light on info though

WTS Light? - do you get it when you first roll-on the key?

Tach Movement? - does the tach needle move up slightly when cranking?

Fuel - pump runs? Fuel refilling filter housing? Tank below 1/4?

Is it cranking fast enough? - it won't even TRY to start if cranking really slowly.

Is your truck "chipped"? If so, remove it as a Test.
when you roll on the key...the tach does move when cranking.
when i first roll on the key i do get WTS LIGHT.
cranking fast yes.
fule pump runs yes.
tank is below 1/4 yes.
the truck has no chip.
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Old 11-20-2012, 03:54 PM
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Have you checked for fuel in the fuel bowl? Put a hose on the 3/8 steel tube, against the motor, above the pass ft tire and open the drain (yellow lever) to see what comes out. Then, close the lever, cycle the key a couple of time (15 sec) and see what was in there...

At under 1/4 tank, there a possibility the pick-up is sucking air and not delivering you fuel.

But, this all just started after a GP change? Could something have come unplugged? How did the UVCH plugs look? Everything tight? Did you do the 50cent mod (or replace the VC gasket) to ensure they don't come apart?

Is it cold where you are? Have you verified the GP system is working? GP Relay throwing and supplying juice to the GPs? What made you change the plugs? Did you get all the oil out of the clys?
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Old 11-20-2012, 04:25 PM
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Quote:
Originally Posted by NoRalPh View Post
Have you checked for fuel in the fuel bowl? Put a hose on the 3/8 steel tube, against the motor, above the pass ft tire and open the drain (yellow lever) to see what comes out. Then, close the lever, cycle the key a couple of time (15 sec) and see what was in there...

At under 1/4 tank, there a possibility the pick-up is sucking air and not delivering you fuel.

But, this all just started after a GP change? Could something have come unplugged? How did the UVCH plugs look? Everything tight? Did you do the 50cent mod (or replace the VC gasket) to ensure they don't come apart?

Is it cold where you are? Have you verified the GP system is working? GP Relay throwing and supplying juice to the GPs? What made you change the plugs? Did you get all the oil out of the clys?
this all started after glow plug change...some oil did get in the clys very little..i didn't check for fule in the bowl, reason for changing glow plugs truck is about 13 years old...no i have not verified the Gp system is working....SORRY BUT WHAT IS UVCH...plugs

Last edited by SLYDOG; 11-20-2012 at 05:04 PM.
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Old 11-21-2012, 06:04 AM
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They are the electrical connections, Under the Valve Cover (Harness), that the power to the GPs pass through. They are problematic in our trucks and, as they age, have a tendency to unplug themselves (this also unplugs the connections to the Injectors)

This explains it pretty well;

http://www.youtube.com/v/GHwjEfJtM_g&hl
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