Loosing speed going uphill and revs at 3500 rpm+

[rv2017]

Hi there
I just bought a Class C 2005 Coachmen Leprechaun. When there is the slightest incline the MH just can’t make it. It got down to 45 mph and revved at 4000 and I had my foot to the metal. It was not gonna go any faster. Also between the driver and passenger seats gets very very hot. When the MH was pulled over to rest, we saw NO leaking and all controls were normal. WHat is the issue so I can get it fixed. Thanks for your help
Judi

[Turtle_n_Peeps]

What's the problem? You ran out of horsepower. Running a big box up a hill takes a lot of horsepower. 45 MPH going out a big hill is pretty good. No CEL no problem.

[DrewE]

What's the elevation you were at? If it's high elevation, the normally aspirated engine will be lacking in power compared to at lower elevations (less air means less fuel burned and less power).

It doesn't sound to me like it's likely to be a fuel problem (though I could well be wrong). I would check the air filter first and the exhaust system for constrictions or plugging second. It would also not hurt and not be hard to inspect the air inlet piping for obstructions or unusual constrictions. Apparently at least some versions of the air deflector (on the Ford chassis) have a sort of flap that can get out of place where the tube to the air cleaner hooks into the diverter thingy on top of the grille.

It's not unusual for the floor to get fairly warm between the seats, as there are exhaust components--and the transmission--right underneath there. This is particularly true under load at relatively slow speeds (at high speeds, there's more airflow to move the heat away). It's also annoyingly normal for the vents to blow quite warm air, especially after being parked for a brief time, since the engine is right under the dashboard and vent ducts.

(Note: I'm generally assuming a Ford E-series chassis; some details may be different for others.)

[ScottG]

darsben1 wrote:
did you try downshifting?

He was doing 4000 RPM. Not sure down shifting is an option.

You may be maxed out on power but it doesn't hurt to check the things others have suggested. I fit has more than 50K miles on it, I would swap out the 02 sensors as well. They may work good enough for the computer to not turn on a light but they get lazy and rob power and fuel efficiency long before throwing codes.
For domestic products, they are usually very cheap and as easy to change as a spark plug.

[dodge_guy]

We first need to know what chassis and engine? And where it was you were driving and what grade?

[darsben1]

did you try downshifting?

[doxiemom11]

Loss of power was the first thing we noticed when my daughters car had a plugged catalytic converter.

[bguy]

Check for plugged exhaust, especially cats if any.

[MitchF150]

If it was fuel filter, I don't think he'd be pulling 4000 rpms with his foot to the floor?? Clogged fuel filter would not let it rev that high as far as I know.

Probably normal, and he just does not expect that kind of performance loss going up the grades?

Not that it makes any difference, but what chassis is it? (Ford or Chevy).

Good luck!

Mitch

[time2roll]

How steep is the hill? Could be normal. Check the air filter too.

[navegator]

Dirty fuel filter, simple solution.

Or the fuel pump is shot, hard solution need to drop the tank to replace the pump.

navegator

[Lwiddis]

Mechanic time. Were your water, oil and tramission temps in normal range? You were checking them as you climbed, correct? Your MH isn’t a horse and doesn’t need “rest.”

[Home_Skillet]

Probably plugged fuel filter.