My guess is (and it is just a guess) is that since you flipped the AC
switch on there's probably a wire
connection to the switch that is routed through relays (or not) to the ECU
and is probably telling it that
the AC is on and so the ECU is trying to compensate for the extra load of
the compressor which is
not engaging so you're probably getting a "miss" in the engine firing too
soon or too late a because
of this "miss-information".....

Steven
91 Westy

On Tue, Aug 20, 2013 at 4:50 AM, Roger Barkley <rvbarkley4347@gmail.com>wrote:

>
>
> -------- Original message --------
> Subject:A/C switch and miss
> From:Roger Barkley <rvbarkley4347@gmail.com>
> To:listserv@gerry.vanagon.com
> Cc:
>
> Started out on a roughly 2K mile trip from east of Cincinnati to Montana
> in our 84 West yesterday.  Thought all systems were a go until I turned the
> A/C on... Nothing! Thought, oh well, we'll just be hot but no reason to
> abort. Then on our way to our first stop in Indianapolis, the engine
> developed a very breif intermittent miss. No pattern, just every so often
> there was a breif, distinct miss. This did raise some concern.
>
> In Indy thought I would look into the A/C problem.....turned out to be the
> switch. Was able to make it work by using some jumpers.
>
> Continued on with our trip with the A/C performing great.......also no
> more engine Misses?? Not complaining, just wondering why a problem with the
> A/C switch would cause and engine miss?