[200q20v] 2121 code

Bernie Benz b.m.benz at prodigy.net
Wed Jul 4 00:16:25 EDT 2001

I would suspect the ISV.  No BTDT with the Bosch valve, but lots of exp with
the Hitachi ISV on the NA 20V.  I'd take it apart and clean it.  After that,
disconnect the elec conn. to the valve with engine idling.  Engine should
continue to run at 700/750 rpm.  If not, adjust throttle air bypass valve to
get idle into this range.  Then, with ISV hooked up, ECU should control idle
just slightly faster, 800/850 rpm.


> From: Neil Swanson <75377.3445 at compuserve.com>
> Date: Tue, 3 Jul 2001 19:31:17 -0400
> To: 200q20v list <200q20v at audifans.com>
> Subject: [200q20v] 2121 code
> Got one
> Got a 2121 idle switch code today.  The check light came on, went off, came
> on.  While the light was on at part throttle the car was surging. The idle
> was fine.
> This 2121 code is the only code I've ever gotten from this car.  I've
> gotten it sometimes when I try to get the car started hot. I have a long
> crank when hot, have for over a year unsolved.
> I replaced the idle switch 'cause of the code over a year ago.  I still had
> the hot start problem and sometimes if I got the light I'd pull the code
> and get 2121.  But I figured it was 'cause I had the throttle open to help
> get it started.
> Now just 2 days ago I had the throttle body off the change the valve cover
> gasket. The TB needed little cleaning I was surprised to see.  But I
> adjusted the idle switch a hair to get it to click into the idle portion a
> little sooner, very little sooner.  This has helped with a 1 in 20 times
> stalling with the AC on problem.  Still just as soon as the throttle plate
> starts to move you hear the click of the switch going off idle.
> So..........   Ideas anyone?  Similar problems?
> Thanks
> Neil
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