Just bought an RV for a great deal and figured I'd need to do some work on it as it had a loping idle and none of the appliances would function without battery or generator so got it home and got started.
Everything on this rig was pretty dirty but after cleaning, lubing, new batteries it turns out almost everything works great. I had to rewire the rear air conditioner as somehow the romex wiring in the wall was shorted together. . . weird! Anyhow I have everything working.
List of what I've done:
Tires $1150 ... installed at my home
Complete lube. Oil, trans, chassis, differential and coolant $50.
Converted Dash AC to R134a from R12 $50.
Tune up= Plugs, wires, cap, rotor, air filter and pcv valve $50.
Timing adjusted to 10 degrees advance.
The loping idle has gone away and I did find a disconnected vacuum hose to the carb which I replaced.
I took it to emissions and it failed TWICE on the HC (hydro carbons) at idle and load.
Before the first test, here is what I did:
Replaced plugs and wires and did all fluid changes.
I checked the Egr valve and it is functioning properly (holds 10" vacuum indefinitely and rpms drop significantly when vacuum is applied in place of vacuum hose).
HC reading first test: Loaded 392, Idle 509
Before the second test I replaced the pcv, air filter, rotor and cap. I also advanced the timing to 10 degrees.
I then added 3 bottles of rubbing alcohol to the gas tank and here are the reading on the second test: Loaded 748, Idle 781.
It might be important to note that the idle and loaded limits are 300.
So all my efforts to pass had the effect of doubling the hydro carbons emissions.
Anyone have any advice on this? Should I mess with the timing?