From digest.v6.n805 Mon Jun 23 20:32:47 1997
From: James Muskopf <jmuskopf_at_vt.edu>
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.
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