Miata Mailing List: October 1997, Message #221
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From: 	David Okamoto <davo@lsil.com>

Subject: Re: Mysterious engine noise

Date: 	Wed, 1 Oct 1997 19:19:17 +0000



Nick Rayner wrote:

> 

> While we're on the subject of mysterious engine noises, try this one:

> 

> I have a mysterious light, ticking/tapping noise, probably 3 or 4 times

> per second (approx). When it happens its very steady, ie: doesn't seem

> to speed up or slow down. It seems to be coming from the front half of

> the car somewhere. Its pretty quiet - ie: I only hear it when there is

> no other traffic around (and the top is down).

> 

> I can most easily hear it when I'm doing about 30 mph (or a little more)

> and only when the car is cruising steadily - if I accelerate more, or

> stop accelerating and let the engine slow the car down, the noise stops.

> I only hear it while the clutch is engaged, ie: have been able to repeat

> it by just revving the engine, or by pushing the clutch in and just

> letting the car continue rolling.

> 

> Also, it seems temperature related. I don't hear it once the car is

> fully warmed up, but also I haven't been able to hear it when I just

> start out, ie: for the 1st mile. Then again this could be because the

> road closest to home is quite rough. Anyway it definitely disappears

> once the car is fully up to temperature.

> 

> Background: I have a fairly stock 92, with 30k miles and manual

> transmission. Its just had its 30k service which included putting MTL in

> the transmission, but I was hearing the noise previously (and still do).

> 

> Any suggestions? I'd love to find it. As you can probably imagine, it

> bugs me somewhat.

> 

> Thanks.

> 

> N.

> 

> Nick Rayner

> email: nick_rayner@trimble.com

> http://www.geocities.com/Yosemite/Trails/7049



Sorta' sounds like it might be one of your heat shields, maybe a lttile

loose until warmed up?



Cars also make a ticking sound when cooling down after all is shut down

in a quiet environment like a garage.  Does your car make this sound

then?



Dave

-- 

Dave Okamoto

LSI Logic Corporation

mailto:davo@lsil.com