Irregular MC idle Problem - Emission Test

[Alex Nikolic]

I have received your comments and suggestions for my idling problem.  Thank 
you.  However, it appears that I am getting into deeper trouble.  My problem 
was (1986 5000 CD TQ) that without load the motor cannot keep consistant rpm 
between 1000-3000rpm.  The motor either races past 3000rpm or drops by 
several hundred rpm and than climbs back up.  I have checked as suggested, 
and the car does receive 12V at the middle wire of the throttle switch 
connector.  I then disconnected the throttle switch connector and started 
the car.  The motor raced up to 2500 rpm where it stabilized.  It would not 
come down however.  I turned off the motor, and restarted it, this time the 
motor worked around 1500 rpm???.  I then reconnected the throttle switch 
connector and disconnected the ISV valve electrical connection.  The car ran 
very well.  It could keep consistant revolutions between 1000-3000rpm.  The 
motor did not race past 3000 or drop hundreds or rpm as before.  I was under 
the impression that this car was suppose to run very rough without the ISV 
connected.  The idle when the ISV is disconnected is around 800-900rpm.

One of the responses I received asked how the car ran at idle.  When started 
from cold, the motor turns at 900-1000rpm.  After several minutes of 
operation the motor climbs to 1200rpm where it stays throughout its 
operating range except for heavy traffic when the cooling fan comes on 
several times in a row, the rpm's drop to 800-900.  I realize that this is 
not proper.  When I have in the past attempted to lower my idle rpm from 
1200 by adjusting the screw on the throttle body, the car cooperated and 
reduced its rpm to 800.  However, once restarted it would go back to 
1200rpm.  (I have always returned the ajustment screw to where I found it 
when purchased)

Last night, following one of the suggestions received on this email list, I 
inspected my throttle body carefully.  I discovered some vertical play (not 
the regular side to side) on the spindle.  Today I will change the throttle 
body with one I have on a parts car that does not exhibit this looseness.  
When I change throttle bodies I will carefully adjust my throttle switch as 
Ned Ritchie has recommended for both closed and open operation.  I am 
confused with my car working better without the ISV connected. Is this 
caused by a vacuum leak around the loose throttle body door.

Peter Berrevoets mentioned a UrQuattro owners club meeting in Mississauga.  
I would be very interested in attending.  Where can I get more info?

Alex Nikolic
86 5000 CD TQ
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