To high HC with co and lambda ok, I say you got oil entering the combussion
chamber some how.
have you checked the valve guide rubber things?
Just a guess.
//Andy

----- Original Message ----- 
From: "Germain Gagnon" <reglys@SYMPATICO.CA>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Tuesday, September 09, 2003 4:13 AM
Subject: ISCU - Trying to fix it

> Hi all
> 
> My engine is not idling well when warming up. I know it is related with the
> idle valve because it is not humming when the ignition is ON (motor not
> running). I did a good reading of the list concerning the Idle Stabilizer
> Control Unit (ISCU) and the Idle Valve (ISV). My bad idle is coming at least
> from these devices.
> 
> SO
> I opened up the ISCU enclosure and found the transistor overheated and the
> 56 ohms resistor overheated as well. I changed both composants:  the
> transistor for a ECG185 and the resistor for a 51 ohms 2 watts. After all, I
> realized that my old resistor was still good. Anyway!!! I Also try the ISV
> with a 12Vdc source and the valve was opening and closing following the
> 12Vdc power On and Off. SO I could say my valve is working.
> 
> I put back the ISCU behind the tail light and connect the ISV to its proper
> connector only. When I turned on the ignition key (motor not running),
> SURPRISE the ISV was humming. I turned off the ignition key and put back the
> ISV with the air hoses. I try it once again (twice) and the ISV was not
> humming anymore.
> 
> Once again I removed the ISV and the ISCU. I though my transistor was burned
> out again. Just in case, I did some quick connection on my bench panel to
> get 12Vdc on the terminal 15 and 31 of the ISCU  and I connected the ISV to
> the ISCU. The result : the ISV was humming very nicely. I also simulated the
> power steering switch and the ISV was humming differently.
> 
> Finaly my question is (thank you for reading until here): Is there anything
> in the logic of ECU or ISCU wich turn off the ISV. Or is the ISV should hum
> forever as long as the ignition key is ON (motor not running)? Otherwise I
> could have a loose connection in the ISV cable? Too dark now, I will
> investigate it tomorrow.
> 
> Thank you
> 
> Germain