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From: bobbyo@celerity.UUCP (Bob Ollerton)
Newsgroups: net.auto
Subject: Re: strange RX7 noises (help!)
Message-ID: <290@celerity.UUCP>
Date: Wed, 22-May-85 22:26:54 EDT
Article-I.D.: celerity.290
Posted: Wed May 22 22:26:54 1985
Date-Received: Mon, 27-May-85 07:17:19 EDT
References: <709@dedalus.UUCP>
Reply-To: bobbyo@celerity.UUCP (Bob Ollerton)
Organization: Celerity Computing, San Diego, Ca.
Lines: 19

What you hear is excess pressure bleading from the gas tank.  It seems
that on hot days or long trips the gas tank gets warm enough to 
create a lot of gas vapor.  The emissions control system trys to hold
the vapors and feed them into the engine when its running.  For some
reason the pressure builds up to the point that a pressure relief 
valve (well,,, thats what the Mazda folks told me) opens up and
bleeds of some of the vapors.  You can confirm that this is what is 
happening by opening the gas cap after the noise starts, if you get
a rush of vapors followed by the noise stopping you have the problem.

Mazda has not given me any answers as to why a $14,000 car has this
rude personal habit.

bob.,
-- 
Bob Ollerton; Celerity Computing; 
9692 Via Excelencia; San Diego, Ca 92126; (619) 271 9940
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