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Path: utzoo!watmath!clyde!burl!ulysses!mhuxl!houxm!houxz!vax135!cornell!uw-beaver!ssc-vax!bossert
From: bossert@ssc-vax.UUCP (John Bossert)
Newsgroups: net.auto
Subject: Re: Question about cruise control
Message-ID: <22@ssc-vax.UUCP>
Date: Thu, 26-Jul-84 16:54:02 EDT
Article-I.D.: ssc-vax.22
Posted: Thu Jul 26 16:54:02 1984
Date-Received: Sat, 28-Jul-84 09:16:52 EDT
References: <2738@decwrl.UUCP>, <261@edsel.UUCP>
Organization: Boeing Computer Services, Seattle WA
Lines: 35

I mailed a similar letter to the original poster; maybe this is
info for the whole group:

Cruise control basically consists of a magnet attached to the
driveshaft, usually behind the transmission, and a fixed sensor attached
to the underbody of the car.  As the driveshaft rotates, it stimulates the
sensor, causing it to send pulses to the electronics box on the engine, 
which controls the engine speed.

I had a similar problem with my 320i.  The problem, it turns out, is that
the sensor is not close enough to the magnet.  It misses pulses, and the
engine surges.

The solution to the problem is to perform some creative bending on the
brace holding the sensor to the bottom of the car.  There should be no
more than the thickness of a few pieces of paper between the two components
when they are in line.  The only concern is that they do not rub when the
driveshaft (and magnet) rotates.

Cruise control works fine on a manual transmission car, so long as you
don't try to cruise at 10 mph while in 5th gear :-)


				John Bossert
				Boeing Computer Services
				Seattle, WA
				uw-beaver!ssc-vax!bossert

-- 

				John Bossert
				Boeing Computer Services
				Seattle, WA
				uw-beaver!ssc-vax!bossert