sch@dedalus.UUCP (Steve Holzworth) (05/15/85)
Here's an unusual problem that has finally begun to bother me enough to do something about it: my 82 RX7 GS makes a strange depressurizing noise when I stop and shut the engine off. It only happens during hot weather (unrelated to air-conditioning) and seems to be coming from the rear of the car. The best way to describe it is as a sort of whining, escaping air noise. It generally lasts only a few (10 or so) seconds. I do know that the fuel system tends to generate suction, but I don't think it is related. I've never heard other RX7s make the same noise. Mine has done it pretty much since I got it in '82. Any suggestions? I'll listen to about anything. Sorry if this was posted twice. Our Cadmus dropped it on the floor the first time. Thanks, Steve Holzworth mcnc!ikonas!dedalus!sch
sja@rduxb.UUCP (Sam J. Anastasio) (05/20/85)
> > depressurizing noise when I stop and shut the engine off. It only happens > during hot weather (unrelated to air-conditioning) and seems to be coming > from the rear of the car. The best way to describe it is as a sort of I have an 85 RX7-GSL-SE with less than 2,000 miles on it. I have experienced the exact same problem you describe. I am fairly certain the problem is a seal problem at the gas cap. Try removing your gas cap the next time you hear the noise. We haven't had hot enough weather lately for me to check the problem further. When it happens again I hope to solve it. Just wanted you to know that you aren't the only one with this problem.
bobbyo@celerity.UUCP (Bob Ollerton) (05/23/85)
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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