Sam Scholten wrote:
>
> Hey volks,
>
> Great to be back.
>
> While my '84 is out of commission as I try to find out what thing is
> grounding out behind the dashboard, the bus also has a little engine
> quirk that I might want to sort out before Grey Gus the Volkswagen Bus
> hits the streets again. (Incidentally, thanks, Joel and Ken, for the
> electrical advice. I'll post my findings- inevitably, someone else
> will have this problem; I've got a feeling about that.)
>
> As the engine warms up, it sounds like I'm lightly revving it once per
> second. As I have an automatic transmission, it does this when idling
> in Park or Neutral as well as coasting in Drive at low speeds.
> Otherwise, the engine runs GREAT- easy, instant startup, no
> hesitation, plenty of power for a Wasserboxer, no misfiring, etc. I'm
> almost scared to mess with it for that reason. The exhaust looks fine-
> no oil or coolant, and it doesn't look like I'm running rich. The 1.9
> does guzzle gas, but I chalk this up to the auto tranny.
>
> I just need to know if this is something that can be ignored or if
> this indicates a large problem somewhere.
> As always, any advice is appreciated.
>
> Thanks!
>(snip)

When that happened to my 84 Wolfsburg, somebody told me the air flow
flapper valve in the air flow sensor sometimes gets gummed up. Sure
enough, I cured it by thoroughly cleaning the pivots inside the intake
air sensor with spray carburetor cleaner. It's happened once since then
and I cured it the same way.