For the later models Coachmen motorhome owners...
FYI Air box restriction alert.
You might want to look under the hood and check your engine air intake box (where your air filter resides). If you didn't see the post about the blue cap you might want to know that during production, Coachmen may have left a blue cap on one of the air intake holes in the air filter box.
Open the front "hood" and you should see among other things, a large black box with an air snout on the passenger side of the box. You should also see a smaller hole, about 1 or 1 1/2 inches in diameter on the lower right (drivers side) pointing forward toward you. In my case that inlet was capped with a bright blue plastic cap. Its a hard item to miss as you are looking into the engine area.
The cap is supposed to be removed at delivery of the Ford stripped chasses to Forest River Coachmen or at least should be removed by the factory when the Motorhome leaves the assembly plant.
You should pull the cap off and discard it. Leaving it on reduces the air flow into the air filter box and thus the engine. Could possibly, (but not for certain) affect gas mileage, engine power, and intake noise.
Gary, Cindy, Reacher (Maine Coon), and Vivian (in spirit only now).
Retired: July 31st, 2013 and loving it.
2011 Coachmen Encounter 37 TZ pulling a 2012 Wrangler Unlimited Sahara. Many upgrades, additions, mods, and changes.