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Re: Coupe Quattro 20V ISV question
if the car died, my feeling is the static idle adjustment is off. Mine a few
years back did something similar till I adjusted it. Check the Bentley
manual for procedure. You have to disable the ISV into going into
a static mode; just disconnecting it and adjusting the idle won't work. Mine
with the ISV disconnected runs at very low RPM, but doesn't stall so lonog
as engine is warmed up.
if you don't want to buy a manual, might try inserting a fuse in the fuel
elay, then adjusting the idle with the screw in the intake duct just by the
throttle plate. Spec is 800 +/- 50 RPM.
Ray Calvo (firstname.lastname@example.org)
1990 Coupe Quattro
In a message dated 97-06-23 17:55:36 EDT, email@example.com (Peter
<< Subj: Coupe Quattro 20V ISV question
Date: 97-06-23 17:55:36 EDT
From: firstname.lastname@example.org (Peter Schulz)
To: email@example.com, firstname.lastname@example.org
My 1990 Coupe Quattro is going through a habit of stalling and
irregular idling. While driving, and then for instance, taking
the car out of gear to stop, the rpms will drop to 500 or below,
causing the motor to buck, sometimes stall, sometimes return to 900.
I replaced the ISV two years ago, and I recently replaced the old
rubber crankcase breather with the upgraded metal replacement.
Cap, rotor, plugs, plug wires were replaced last year.
I always run the CQ on Texaco 93 octane. As a test, I disconnected
the ISV lead, and the engine promptly died. The engine would not
start with the ISV lead disconnected.
I removed the ISV, and cleaned it with carburetor cleaner, and then
thoroughly with brake cleaner with that ran out. After the ISV dried,
I reconnected it, along with the lead.
The engine idled better for a while, then returned to its old habits.
This problem seems to be accentuated by hot, humid weather.
1990 Coupe Quattro