7.3 not running! - Ford Powerstroke Diesel Forum
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Old 01-06-2010, 11:22 AM
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7.3 not running!

So heres the problem. Its been cold here for a few weeks now, lately been getting down into the teens, and even single digits. When I last fueled up (about a week ago) only put a half tank in. I didn't put the dieselkleen additive in (blew it off because it was starting fine lol) I sometimes plug it in, sometimes not it depends where I end up parking when I get home.. Either way plugging it in usually helps but now nothing. Anyways, I went to start it yesterday morning with a little bit less than 1/4 tank and it was plugged in. Started up fine, let it idle for about a minute (late for school haha) Took off, went down the end of my road and around the corner, stepped on it alittle to get up a hill and it kind of lost power and started loping, shut off. I let the GP's warm back up and tried again. It loped for about a minute straight and i tried keeping it at 1000rpms, warm it up a little bit more and it finally started running fine and by the time I got to school it was up to temp and running perfect.

Now, when I left school It was of course cold, started fine and then the exact same thing happened. So I poured about an OZ of the dieselkleen in the tank and got it to idle some how, eventually warmed up and I got home. Started it a few times when I was home and it was normal, fired up no problems. Eventually went out and filled the tank up and put the dieselkleen in.

This morning I went to start it, not plugged in. Cranked and got nothing. Waited for plugs to warm up a few more times. Fired up and idled for a few seconds, then started loping and died. Tried a few times and said F it and took my dads chevy to school. Got home and tried again.. same exact thing happened. It will fire after cranking for a while and run really rough, sometimes idle normal and then eventually die. I pulled the fuel filter out to check if it was gelled inside there (recent filter) and it was not. I tried the trick of putting cables from the positive terminal on the battery to the GPR, and it didn't do anything..

I'm thinking that its either gelled fuel or GPR/GP's.. What else could it be? Its been just plain cold here lately and it's been starting and running absolutely fine until these two incidents.

Anyone got any pointers..? Thanks
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Old 01-06-2010, 11:29 AM
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if it was not starting at all id say gp gpr but since it dies id say its gelled up. if its posible pull in a shop or garrage and if posible put a heater to it. mine has done that twice and once it got warmed up it kept runnin g
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Old 01-08-2010, 06:00 AM
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yup, its gelled somewhere, maybe in lines or in the tank but its gelled somewhere.
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Old 01-10-2010, 08:18 AM
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DOES IT RUNN REALL ROUGH WHEN IT IS RUNNING... IF SO CHECK OUT YOUR GLOW PLUGS CONNECTIONS AT THE VALVE COVER.... HERE IN ILLINOIS WE HAVE A PROBLEM OF THEM CORRODING AND NOT FIRING ONE BANK...
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Old 01-10-2010, 08:31 AM
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I don't think it's gelled.... First, the "teens" just don't do it. They guys who have gelling problems (with the winter blend you have in your tank by now) are below 0 (actual - numbers, none of that "wind chill" BS ) If you're not below ZERO, you're not gelling-up.

Also, you'd see evidence of gelling when you looked into your filter housing.

I'd look into NCHornets sticky on GP problems (you talk about having to plug it in so, seems likely somethings not right there) and next, you could learn alot by scanning it for codes that could get you in the right direction... Maybe look at the "under valve cover harness" connections.
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Old 01-10-2010, 08:44 AM
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i'd swear my ipr sticks and causes sometimes similar issues.
You can try unplugging the icp sensor. When unplugged it sets to a default setting which is more then enough to idle fine. ALso, oil can leak thru the top of the icp sensor. I had to replace mine.
If the ipr sticks open, (its open when the key is off, partially closes when running and more pressure is needed.) it can cause no injector pressure or not enough to run.
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Old 01-11-2010, 04:45 PM
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your trcuks proabably just cold..plug the truck in for a couple hrs and have some good cranking amps to turn it over..when i had my 7.3 even if it was 30 out didnt like to start..truck needs to tun over quite fast to start in the cold aswell..keep it plugged in and i gurantee youll be fine
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