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Powerstoke has no power towing - Please help
It's no joke this 7.3 can't tow. Truck is a 2000 Ford Excursion 4x4 7.3 with 198,000 miles. Truck is completely stock with only a 2" lift and 33" tires. Exhaust stock, Intake stock, no tuner, no chip, etc...
Truck was purchased 6 months ago to tow a 10,000lb travel trailer that we are planning on getting this spring/summer. Everyday city driving without a trailer the truck has no issues. Starts up great, sounds good, idles good, basically you can't see anything wrong with the power. Now hook up a trailer and she struggles.
Over the summer it was struggling pulling my 3,000lb popup camper up hills. I knew it had a problem then and took it into the dealer for the CPS and cruise control recall. I asked the dealership to investigate why it was so low on pulling power. Dealership said it had an up-pipe leak and the IPS sensor was leaking oil. I took their word for it and it seemed like a common issue with the 7.3's. I replaced those parts with bellowed up pipes and a new ICP sensor. Part cost total around $600 bucks, a day of labor, and truck still can't pull... I've replaced the fuel filter, checked the turbo by spinning with my hand and checking for play. Everything seems ok. Then I bought a compression tester to see if the engine was tired. Every cylinder checked out between 390-400psi. I checked all the rubber intake boots and intercooler boots and all checked out ok. I can hear the turbo spin up when I give it the gas so I think it is working. I have no gauges to check if it makes boost.
This past week I took my 4,000lb 4 place snowmobile trailer up to the Michigan's UP and I had the truck floored going up hills. Every rolling hill I came up on I-75 this truck had to down shift and I had to put my foot to the floor to get this thing over the hill. After tracking the mileage I got 10.3mpg with 700miles towing the 4000lb trailer. Usual MPG with city driving no trailer is around 14MPG. My old 2007 trailblazer that was replaced with the 7.3 pulled over these hills with no downshift or struggles. These aren't mountains I'm going through, just big rolling hills.
This truck as is can't tow much over 5,000lbs let alone the 10,000 travel trailer camper were planning on purchasing this summer. I am currently hiding this from my wife right now in fear that she's going to give me a hard time about the money and time to fix it. Need to investigate & fix the problem at a minimal cost when she's gone for the weekend.
I know there is something wrong, but I just can't throw money at new parts hoping to fix the problem. I want to truly diagnose what is wrong and fix that. Everyday driving it has plenty of power, but when I hook up the trailer forget it. Can you guys give me any ideas or things to check on? I am a very mechanically capable person just need some trouble shooting guidance.
Thanks and sorry for the long story, just trying to give all the facts up front.