engine is bucking when a/c is on

[DAK]

I'd be willing to bet it is a clamping diode (or a flyback diode?) When
I used to tinker with electronics, it was well know that when you
engerize a coil, there is a voltage spike kicked back which needs to be
clamped. A diode is good at that (given that it is rated properly and
installed in correct orientation...)
I'd vote for Bernie's fix!

David

Gordy_Schesel at allianzlife.com wrote:
> I like your usage of the term "misfire" better than my "bucking" and I
> think you're right-on with your diagnosis...thanks.  And maybe Bernie will
> volunteer to supply the 10 cent solution...or was this a good natured dig
> on Bernie.
>
>
>
>                     Kneale Brownson
>                     <knotnook at traver       To:     Gordy_Schesel at allianzlife.com,
>                     se.com>                 200q20v at audifans.com
>                     Sent by:               cc:
>                     200q20v-admin at au       Subject:     Re: engine is bucking when a/c is on
>                     difans.com
>
>
>                     07/16/2003 01:52
>                     PM
>
>
>
>
>
>
> At 12:24 PM 07/16/2003 -0500, Gordy_Schesel at allianzlife.com wrote:
>
>>... Engine bucking occurs only once in a while in the higher gears but
>
> only when the
>
>>a/c system is operating...
>>
>
>
>
> There is a known problem of the magnetic clutch on the A/C causing a shock
> to the ECU.  It's described on Scott Mockry's
> website:  http://www.sjmautotechnik.com/   A frequent additional symptom of
> this problem is that the radio makes a "pop" noise (if it's turned on) at
> the same time the engine coughs.    Bernie Benz has a 10-cent fix that
> involves soldering something onto the A/C relay.  Audi's fix is $150 for a
> revised relay and an insert into the wiring harness to the A/C clutch that
> adds a diode to the wiring.
>
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