2002 7.3 will not start
 

hey guys i am new to this site as well as the powerstroke world. I just recantly bought my truck its a 2002 F-450 6speed 4x4 with 98ooo miles. The truck was ex goverment so i figured it was some what well maintained and a good deal. I got in the truck and it started no problem everyday for 2 weeks. Then i let the truck sit for 4 days went to start it and it cranks but wont catch the batterys seem new and have a lot of juice from the way it turns over and the starter seems strong. I am lost on what it could be since it ran good about a week ago i had the check engine light go on and the battery light for an hour but then it turned off. sometimes it flashes for a couple seconds and turns off . please help

Check all your battery connections, they must be good and solid. Also, using a test light, check to see that the Glow plug relay is working (top of the motor in the valley back one)

so the batterys are new and all the connections are tight i checked the gpr and it reads I also pluged the truck in and it started right away. Is that mean glow plugs

That leads to glow plugs for sure...

do you know what the best glow plugs are. My truck does a lot of extreme winters in Alberta just wondering if some are better then the other i ordered some bosch ones, also can you check the glow plugs i have read you uplug the conector and you can put a volmeter on the plug witch holes are for the glow plugs and what should it read.

You can test them, but once in that far, just replace them all... Cheap, easy, done.

Bosch is fine...

so i replaced the relay for the hell of it and checked all the glow plugs they all read 0.9 ohms is that normal for all of them to have the same reading. oh and my truck still dont start unless i plug it in. i hear the glowplug relay turn on but it still wont go.

7.3's are cold blooded, they're not known for the best cold weather starting, not saying they're bad, but they're not the greatest, replace the glow plugs and go from there

yap i am really atarting to miss my 12 valve. I just dont want to change all the glow plugs for no reason if i dont have to. i really considering selling this truck

yeah I don't know the specs they need to be in to tell if they're good or not, have you tried starting it with ether without being plugged in

nope the truck starts when plugged in, if i start it with ether what will that tell me

well that would mean the glow plugs are bad if it starts cold with ether

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I guess another thing is does it always have to be plugged in to start? or just the initial start of the day?

it has to be pluged in for the initial start of the morning i have turned it off and let it sit for half an hour and it will start again no problem.

yeah, i'm going to say it's the glow plugs, but I cannot guarantee anything because I do not know much about PSD's

I know it's a little late for a response. But I had this same problem a few years back. My 7.3 would not start under about 25F. It's most definetly the glowplugs. I want you to try something first off.

Turn the key and wait until the wait to start light disappears. Instead of starting it like usual, turn the key off. Turn it back on and do the same thing. Do this about 3 or 4 times. That might work but I'm not exactly sure. It did for me. I bought Bosch glow plugs and it's started as low as 5F without being plugged in. I try to plug it in though when I know it's going to get below 20F just to be safe.

I hope I helped!