Hey so im new to the diesel world + this site and need some help....
I just bought a 2002 7.3 F350 4x4 crewcab long bed 93*** miles and its a big upgrade from a 150 for towing but i just towed my fork lift (6000lbs + trailer 1200lbs) to a job site and i was not so happy with it. I was cruzin at 55 then hit a little hill and dropped to 40mph real quick then pretty much had to floor it to keep the 40 goin. Then i got to the job and it was a pretty steep hil but not to crazy and going up was a strugle (15-20mph at 2900rpm) I expected the truck to pull the weight way better??? has any one had any problem like this? little more detail the truck is lifted on 35" tires with a 3:73 gear thought it could lose some low end grunt but lose all of it i would hope not. I read some people tow their 40' 5th wheels on 37" tires and 3:73 gears no prob so figured mine would be ok. I didnt have a boost gauge so i dont know what the boost was but now i got one and with no load i see 19lbs dont know if it matters but mor info the better. NEW cam position sensor NEW ICP and NEW IPR valve so what could caust the truck to tow so poorly?

please help ant leads would be somewhere to start thanks

 

on your truck i think you should be seeing more in the 20's for boost. and 37's for towing? come on and with 373's but still i think you're boost is low

 

If i unplug the wastegate red vac line i make a good 25lbs but with it all hooked 19 is max and 35" tires is what i got i thought of going to a 4:10 or 4:30 but to me it feels more of a motor prob or something not working right. i would thing 3:73 would get ther just little slower but it aint gettin there

 

have you towed at 25lbs boost?

 

no

 

my 6.9 n/a did better than that in the p.a. hills so theres deffinitely something wrong.

 

where to start tho what goes wrong with these truck to act like this

 

well there could be a boost leak but usually that causes you to build very low boost. is it very cold where you are? when was the oil changed what oil is in it? it's always a good idea when you get a new vehicle to change all fluids

 

Your boost is normal. Stock is around 17 or 18. Start with the basics. Change oil and fuel filter. Also where are you located? If you dont let these things warm up when its cold out they are ball less till the oil heats up.

 

i changed the oil and filter 15-40 about 1500 miles ago and changed the fuel filter B4 i changed the IPR valve about 1000 miles ago.... live in California so the waether has been between the 70-50 degrees so i dont thins thats the prob