Power Loss - Fix Recommendations

[DMDSKI]

All, good evening. I own a Thor Daybreak 32 HD 15k miles - Required services done -and specs listed below. I have a separate posting "Tea Pot".....

ISSUE: When driving with TOAD at 70 MPH I got a "tea Pot" whistle and then loss of power. I had to press and release the accelerator pedal to get the transmission to shift the transmission into a higher gear and reduce 6500 rpm. Nursed to the Ford Dealership at 55 mph.

Dealership: Exhaust manifold leakage - repaired tea pot noise. Stated fixed. Picked up and attached TOAD. Great performance until I tried to get to 60 MPH and no power and again 6500 rpm - same issue and returned to dealership.

Dealership: Senior Gas Engine Mechanic - tested fuel quality, fuel pump, exhaust compression, Tork test. All within normal specs. Transmission Specialist - Its an engine problem - Senior Manager Involvement. I gave the Thor Chassis Help number - doing more tests - 48 days and counting

IRV2 Recommendations? Past History with the Same Problem

Engine
Engine, Triton / V10, Chassis Brand, Ford Chassis Model, F-Series Super Duty, Cylinders 10, Horsepower 362 hp @ 4,750 RPM, Torque 457 ft-lbs. @ 3,250 RPM
Displacement, 6.8 litres, Fuel Type Gas, Fuel Requirements Regular, Carburetion Type Fuel Injected, Turbocharged No, Supercharged No

Transmission
Transmission Brand TorqShift, Transmission Type 5 Speed Automatic Overdrive Yes

[Sweetbriar]

If you are correctly seeing 6500 RPM I would consider replacing the ECU or figuring out how your are seeing an RPM that high considering the electronic limiter in all gears except OD is 5250 RPM and in OD 3000 RPM (limits speed to 75 MPH). The ECU also controls the shift points on the transmission. Might not be the problem but somewhat of a common point.

And why are you dealing with Thor when Ford built the chassis?

[tderonne]

Not a lot to go on, and the 6500 RPM thing is just wrong, but sounds like the catalytic converter might be plugged? If it drives that bad, you'd sure think even a terrible dealer would recognize that.

[ga traveler]

The other posters are correct. You should never see 6500 rpm. That is way over the limiter speed of 5250. Ford uses a ceramic honeycomb cat. converter. They are prone to break. I have seen them break on the way from the factory to our dealership. Take out the three bolts and look into the exhaust pipe. If the converter is O.K., next check the air filter and intake system.

[avfordguy]

6 grand ? Never seen that on a v10! Maybe teach was programmed by accident to a 5.4? 5260 is governed rps for a v10.

[tiffy2000]

are you sure that the transmission isn't slipping ?