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From digest.v6.n805 Mon Jun 23 20:32:47 1997
From: James Muskopf <>
Date: Mon, 23 Jun 1997 19:52:51 -0400
Subject: Re: E30 M3 Questions : Part II

I have had the same problem with my engine. My problem was caused by maladjustment of the throttle position sensor (TPS). The switch has three positions: Idle (zero throttle), full throttle (not necessarily at 100%), and an in-between position. If the switch doesn't close when you let off of the throttle, it will have an abnormally high idle.

Pins 1 and 2 of the switch should have continuity when there is no pressure on the pedal. Then very little pedal travel should result in discontinuity between 1&2. If you have to press the pedal too much to get the switch to come off idle it will result in a kick upon acceleration. Once you think you have it adjusted correctly, have your assistant depress the pedal and release it very slowly. If the switch does not go back to idle (continuity between 1&2) when he/she completely releases the pedal, you will have to allow for a little bit more pedal travel to take the switch off idle.

Hope this helps.

James Muskopf

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