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>From: "Woolston Craig" <cwoolsto@ladc.lockheed.com>
>Well my '71 FI Fastback was starting to go through more than it's fair
share of gasoline and the spark plugs were pretty fouled.
>So I put a meter on the battery and it was only showing about 12.5 volts.
So I got a new Bosch voltage regulator (Jim, I wish you
>would starting building these things) and got the voltage up to 14 volts at
the battery. But the car still seams to idle to fast a
>startup. After it warms up it is fine, but at startup, regardless of
outside air temperature it is idling at about 1700 rpm. After it
>warms up it is at about 800 rpm (automatic). Any suggestions?
Unless the engine is "loping" right after it starts up, this may be about
right. I agree that 1700 sounds a bit extreme, but the aux air regulator is
supposed to do this to some extent. If it is really that extreme, then the
AAR is over compensating and you may be able to help this a bit by putting
some kind of limiting aperture in the air line that runs from the air filter
to the AAR. If this problem is due solely to the AAR, then blocking off
that hose with your thumb when the engine is first running, and cold, should
make the idle drop right back to 800. If not, the cause lies elsewhere.
On your car the AAR should be the electrically heated AT version. I have
never had a car where the idle varied this much, so I suspect that there is
some other problem. I would make sure the ignition advance (both) are
working properly and that the fuel pressure is correct. Of course the
valves and timing must be correct.
It's also possible that you have a vacuum hose that is cracked and leaks air
in when it is cold, but that softens up and seals when it is warm.
Jim
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Melissa Kepner Jim Adney
jadney@vwtype3.org jadney@vwtype3.org
Laura Kepner-Adney
Madison, Wisconsin
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