Ok so i just bought a 2004 F350 with 160k on it. it is completely stock... truck has been running great. drove it today and no problems then my wife took it to school tonight and said that she has no power and it wont go over 45mph... its been in the negative temps since yesterday evening so im not sure if that can be part of it... any suggestions of wat to do in the morning would be grateful thanks guys

 

probably fuel gelling, make sure you let the truck warm up for a while, let it get to temp first, hopefully that is all it is

 

yea i through some of dps's stuff in it earlier to prevent the gelling... the truck has been running most the day without a problem... and she just called and said it was fine now... so idunno wats goin on... this week ill get it in the shop and start looking though...

 

when its below zero it still might gell some, by letting it warm up the fuel gets circulated and heated up some, always make sure you keep the tank as full as possible, it helps. the oil has to get to temp also, I always wait until the rpms go up on there own to about 850-900, that is when the oil temp has reached the proper temp, it drops to 625 as soon as you tap the brake

 

Fuel was probably jelled up. Keep some anti gel in it and it should be fine.

 

yea normally i wait untill the temp gauge starts goin up... but of course this was my wife driving the truck not me

 

or it could be a fuel filter

 

wouldnt it be more consistent if it was a fuel filter?

 

Mine gelled last monday, I had opti-lube and power service in a full tank of fuel. Truck started up no problem in the morning (was plugged in all night) and I let it idle in the driveway for about 15 minutes. As soon as I took off down the road it started losing fuel pressure. The filters were allowing just enough fuel to keep it running at an idle, but not enough under load. I added the 911 to filters and dumped rest in tank, and still no dice. I ended up filling my vegistroke tank up with kerosene and manually switching over to that and got it going and made it to work like that. It wouldn't hurt to inspect your fuel filters at this point.

Also this is just one more reason why every 6.0 should have a fuel pressure gauge.

 

yea i understand the gelling up... but if it was the filter wouldnt it be underpowered all the time??? because she was driving it and said it was underpowered... then she stopped topped off the tank and now she says it is fine... either way this week im puttin it on the lift and changing all the fluids and filters just because it has 160k and i dont know wat has been changed and what hasnt