hey guys, im hopeing some of you might be able to help me out here. I bought my 02 F250 with the 7.3L about 2 months ago its got roughly 135K on it right now. it has not been real cold here right around 40-45 and unless the truck is plugged in for a few hours it has what i consider to be long crank times 10-15 seconds. a friend of mine has a 02 also and his will fire with little cranking as soon at the glow plug light goes off.. so here is what i have done, knowticed my GPR was cracked so i replaced it and double checked to make sure it works, just replaced my glowplugs, uvc harnesses and valvecover gaskets. I also replaced my ICP sesor yesterday after knowticing it was leaking oil out of the electrical plug. so i went out this morning and started it, it still cranked for like 10 seconds before it lit. i re-checked my GRP and its working, re-checked my ICP sensor and there is oil in it again, maybe i didnt clean the connector as well as i thought i did before i installed the new sensor ( this is what concearns me.. especially when that damn thing was $177 bucks). im going to replace the fuel filter and check the oil level in the HPOP res. in the morning after i get done doing the x-mas stuff today. just wondering if anyone has any other input or ideas to look at. im almost thinking its the HPOP, is it typical to have to replace the hpop around 135k?

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oh i forgot to add, it will usually fire right up if it has been started within a few hours.

 

Glow plugs possibly

 

i have 223k on a stock HPOP.... check the glow plugs, the relay, and make sure you are full of oil, if your HPOP was dead the truck wouldn't even attempt to fire up, nor run

 

I was reading on another site that the glow plugs continue to get hotter if you wait past when the indicater light goes off before you crank it over. I want to try this out because mine doesn't want to start when it's cold either. they said they stayed on for 1.5 min.

 

i tripple checked the GPR, and the glow plugs are literaly brand new, they are from DieselRX. i made dang sure that all the electical connectors got pushed on good and tight (what a pain with the harnesses being new). it was raining to hard today to get out and check the HPOP res. and change the fuel filter. im curious why the new ICP sensor already has oil in the plug though, i cleaned the the male end on the wire harness with electrical parts cleaner spray so im sure it couldnt be residual oil left on it from the old sensor.. im not entirely positive on how the HPOP relief valve works but i would assume that it is non-adjustable and if wore or bad would not cause an increase in oil pressure that could be blowing that sensor .... who knows maybe im just off my rocker with the whole thing.. how long does it usually take for you guys to fire up your trucks if not pre-heated with the block heater? this is after all my first 7.3L but it dont seem right the way it cranks before starting.

 

if i don't plug mine in it takes a good solid 5 seconds of cranking? hard to say haven't started it cold in over a year ha, right now its tore apart, but anyways they are a pain when not plugged in

 

It's been around 0* here at nights and mine fires up after a few seconds of cranking if not plugged in. Even knowing that I like to plug it in for at least 2 hours before starting. Only 2 hours may not be much per say, but with the frigid temps, it does help...and fires up immediately.

 

Leave it sitting and check the HPO res, If its not within about 1/4-3/8" of the top you have a leak down issue.

Could be injector related, could be O ring related, could be IPR related.

I would get a scanner on it and check ICP pressures and duty cycle when cranking.

 

How cold does it get in your neck of the woods? I have Never had any trouble starting mine but the coldest it has been is 25 outside.

 

oil slipping past injectors into pistons possible?