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instant HP =8)

(this should be apropos to Motronic equipped Audis!!)

I adjusted the throttle position sensor (TPS) on my Motronic equipped
motorcycle last evening. I had been experiencing some throttle off
backfiring, particularly if I snapped the throttle shut from high
RPMs (e.g. 6K or more).

This particular variant of TPS is similar to the one in our S6, except
it doesn't have the switch for throttle closed sensing. The TPS is
basically two potentiometers which provide an increasing and decreasing
voltage to the ECU. The lower limit of the TPS for my bike was spec'ed
to be in the range of 370mv to 400mv. I also got a tip that for sea
level, 390mv is the preferred setting.

Upon peeling back the insulating boot and installing my bent paperclip
test lead, I hooked up the voltmeter. Loosening the clamping screws, I
rotated the TPS until 390mv was reached. I clamped it down, retested
the value and removed the testclip.

The difference was amazing! I cannot believe that such a seemingly minor
adjustment made that much change. No more backfiring, better idle and
_very_ linear throttle response.

Okay folks, since our Motronic Audis have a similar TPS, what is the
correct setting procedure? And what variations for altitude (or lack
thereof)? I'm thinking of having the dealer 'adjust' my TPS real soon.

any takers? Scott? Eric? Paul?

steve powers ... '95.5 S6 ... '95 620RX/C ... '91 K100RS-16V ... '88 R100S
spowers@spdg.com * stratos product development group * seattle, washington

"I must tell you that these are strong Bavarian beer-carrying horses, not
 the smaller ones of Italy." (Ferdinand Piech)