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Re: Coupe Quattro 20V ISV question
Peter Schulz wrote:
> 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.
> Any ideas?
> Peter Schulz
> 1990 Coupe Quattro
What type of spark plugs are you useing? I find that my CQ 20V will not
run right with
anything other than the factory plugs F6DTC.