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From: mikey@trsvax.UUCP
Newsgroups: net.auto
Subject: Re: Question about cruise control - (nf)
Message-ID: <55200092@trsvax.UUCP>
Date: Thu, 26-Jul-84 10:03:00 EDT
Article-I.D.: trsvax.55200092
Posted: Thu Jul 26 10:03:00 1984
Date-Received: Sun, 29-Jul-84 23:52:54 EDT
References: <2738@decwrl.UUCP>
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Nf-ID: #R:decwrl:-273800:trsvax:55200092:000:905
Nf-From: trsvax!mikey    Jul 26 09:03:00 1984

#R:decwrl:-273800:trsvax:55200092:000:905
trsvax!mikey    Jul 26 09:03:00 1984



You didn't state what kind of cruise control it is.  Most aftermarket
units sense the speed and use engine vacuum to pull the throttle and
thus maintain speed.  If you have a vacuum leak, it could cause the
range of the unit to vary, giving the symptoms you described.
Most factory units are simpler and a vacuum leak is even more 
noticeable.  The aftermarket units with a solid state control box 
will usually not be as bad on a vacuum leak.  They usually have an
internal ajustment for "Lock Range" of the speed.  The sears unit I
put in my Sport Fury a few years back could be adjusted to hold the speed 
to within 1 mph or let it vary up to 5 or more mph.  Most places that 
install these types will usually set them for a fairly wide range, as this
gives better fuel economy, but too wide can give the results you are 
getting.  I'd say have the thing checked and/or adjusted.

mikey at trsvax