[Shotimes] Engine speed oscillation

[Don McKinnon]

Cam Sensor...

Don McKinnon
96 Black - Borla
95 MTX White/Tan - Many mods


-----Original Message-----
From: shotimes-admin@autox.team.net [mailto:shotimes-admin@autox.team.net]
On Behalf Of David Carmean
Sent: Tuesday, May 18, 2004 4:50 PM
To: SHO Times list
Subject: [Shotimes] Engine speed oscillation


I have a '90 with a lightened flywheel and an IPT Stage II (I think) clutch,

with a very odd, highly intermittent, engine problem.

Just after I bought the car about 1.5 years ago, I had the lightened
flywheel 
installed (8 lbs .. SHO Shop?  I forget whose; Not the Fidenza), and I began
to 
notice that every once in a while when I'd first start the car, the idle
would 
wander up and down about 3 times/second for a few seconds, and then settle
down.  
That behavior had mostly gone away until recently;  Now it's happened about 
five times at-speed on the freeway/city streets.

When this happens under power, the car begins to buck violently.  The rate
of 
the oscillation seems to be completely independent of engine RPM.  So far, 
once I've pulled over and shut the engine off for a couple of minutes, it'll
be fine 
again for a few weeks.

The Check Engine light does *not* illuminate.  What I noticed when it
happened to me 
in a parking lot earlier today was that after about four re-starts to get it
to 
settle down, the tach needle did not move for several seconds, even though
the 
engine was running fine.    I'm not sure, but the other instrument panel
lights 
may have also been strangely dark.

Nick ran the codes for me a few weeks ago, a couple of weeks after this
first happened 
at-speed, and there were no stored codes.  I guess I should go buy a code
reader...

Any ideas?  Any ideas where I can get a smog manual for this car?

Thanks.
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