Miata Mailing List: November 1998, Message #580

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Hate to say it Jonathan, but it sounds like the dreaded Light Weight Sports
Crankshaft nose is decaying.  If you didn't already know about this
possibility, check out http://www.miata.net/garage/crankshaft.html
This has tons of info on this problem.

I hope this is not the case though!

Good luck.

Nathan Ramsey
'91 silver base (heavy but safe crank)
Portland, OR
OR tags "PSN 4RD"
-----Original Message-----
From: jonathan roberts <jorober5@vt.edu>
To: Multiple recipients of list <miata@realbig.com>
Date: Sunday, November 15, 1998 12:10 PM
Subject: Underpowered???


>I am new to the list and looking for advice.  My girlfriend just bought a
>Miata and it isn't running right.  It is underpowered and dosen't feel
>right, expecially at low RPM's.  I'm an autocrosser and have driven several
>Miatas (I love them!), but this one is worrying me (expecially since I
urged
>her to buy it!).
>
>Here's the details:  It is a '90 with about 85k on it.  The timing belt was
>done at 60k.  I have checked and/or replaced the following:  plugs, plug
>wires, air filter, fuel filter, and catalytic converter.  Its still running
>weird.  It feels like its kind of missing and underpowered, particularly at
>low RPMs.  Its not completely better at high RPMs, but you can still feel
>the power band.
>
>Any help at all would be greatly appreciated!
>Jonathan Roberts
>
>
>