[encantotom]

i know you are trying to cover all the bases and that is great. that said, there are alot of sounds coming from back there.

a simple drive around the block will test your boost gauge and turbo. not completely but enough to see if you can generate boost.

as for propane, i dont think that coach has a propane tank does it?

there are so many airlines in the engine area. and locating sound is very misleading. it echoes all over the place.

i had a clamp break and intercooler hose come off on the far back side on the top while on the freeway. boost went to nothing, black smoke poured out the exhaust like crazy and i had no power and drove 15 miles an hour till i got off the freeway. point being, if an intercooler hose is off, you know it.

as for airlines.....brakes, numerous brake system valves, air dryer in the drives side tag wheelwell. airbags, leveling system, numerous tanks, six packs.....to name a few that are in the engine compartment and area.

make sure it is safe, but trying to fix everything on maiden voyage may be asking a bit much.

that said, dont want to get stranded. the mechanic you are using should be able to help

tom