[Shotimes] Engine speed oscillation

[cmichaelo@optonline.net]

I don't think this has anything to do with the 8lbs flywheel.  I have that flywheel too, and I made zero difference to my idle. It also didn't make much difference in engine responsiveness. For sure it didn't turn the engine response into that of a motor bike, as claimed by ShoShop. OMG, I ranted them about their claim. But never got a reply from them.

Anyway, I have had a somewhat similar problem to yours. And the problem was a mix of things, but predominantly it had to do with the IAB valve, which I ended up replacing and that took care of that. But also, the MAF seemed to have played a role in this as well as the MAF connector assembly. I had the ShoShop 80mm MAF which I have now replaced with ProFlow 77mm MAF. I also replaced the MAF connector.  I have not had a problem since then (more than one year now.)

Michael Olsen
94MTX,green,BOS+
----- Original Message -----
From: David Carmean <dlc-sho@halibut.com>
Date: Tuesday, May 18, 2004 4:49 pm
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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