Idle problem, '89 200 TQ MC2

[haydn taylor]

hey Ben

I posted the same question recently and finally got round to investigating
this weekend, you were 100% correct - broken wire undeer the rubber  boot on
the throttle switch (which I had already replaced).

I fixed the wire and the idel is now perfect

thanks

Haydn
----- Original Message -----
From: "Ben Swann" <bswann at worldnet.att.net>
To: <l.leung at juno.com>
Cc: <quattro at audifans.com>
Sent: Tuesday, November 26, 2002 2:42 PM
Subject: Re: Idle problem, '89 200 TQ MC2


> Search the archives for "high idle" as I posted recently a complete
> synopsis on this.
>
> I doubt it is your ISV, as you confirmed it is working when you
> disconnected it.  More likely the Idle switch circuit.  Could also be
> hardened o-ring on the idle screw in the throttle body.  Could be many
> other things.  Let us know what you find.
>
> Ben
>
> [Hello List;
>
> My '89 200Q, MC2, chipped seems to be idling rather high, even when
> totally warm. It idles about 1200+ RPM even if I blip the throttle.
>
> I checked the Bentley, but have not had the time to do the whole
> set of tests with the ammeter, and come to think of it, I'm not even
> sure if my ammeter can handle 2 A.
>
> Anyway,  I tried unplugging the ISV with a fully warm engine and the idle
>
> dropped to an appropriate 850 RPM.
>
> When I plugged the ISV back in, it remained at 850, even after blipping
> the throttle.
>
> As an aside, I recently replaced the engine grounds, which seemed to
> help the engine running significantly, but seems to coincide with the
> high idle.
>
> Is my ISV shot, or is there likely a different problem?
>
> TIA,
>
> LL - NY]
>


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