The 20V that followed me home, a few problems
benswann at comcast.net
Mon Mar 21 10:20:10 EST 2005
[Date: Sun, 20 Mar 2005 21:13:29 EST
From: TWFAUST at aol.com
Subject: Re: The 20V that followed me home, a few problems
To: quattro at audifans.com
Message-ID: <96.23a25df0.2f6f87c9 at aol.com>
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A month or two ago, I was followed home by a '91 90 20VQ. It has been hanging
out under my barn while I replaced the rear diff bushing and some fuel lines.
I don't have a Bentley yet (I prefer Haynes because the index is more
complete), but I have a few problems
There is a noise under the hood which I can only describe as a whistle. I
can't seem to locate it. I notice the alternator belt is loose, but I have never
heard a belt whistle.
*----- Probably a leak in the intercooler to throttle body hose and may be source of high idle problem.
Slow return to idle
If I run it up to 3000, it very slowly returns to about 2000 where it will
hang for about a minute. Then it will suddenly drop to 1400 and then slowly drop
to about 1000.
*----- Sticky throttle body switch/potentiometer - the idle switch portion not closing. May need adjustment, possibly replacement.
When I shut it off today it ran on at about 600 rpm. It quit when I stepped
on the gas (just like the carburetor days) I had 89 octane with a heavy dose of
Techron in it.
*---- don't know about this, but possibly related to air leak.
Does the 20V have the dreaded "ISV"?
*----- Yes - works pretty much the same way, but I forget whether it is 2 wire or 3 wire.
I notice that if I pop the oil fill, there is no difference in idle. Vacuum
*---- That's what it seems to be.
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