lean at idle

[urq]

... one possibility just came to mind ... there's an air valve that bypasses
the airflow sensor plate on the airbox ... it is used to cut off fuel on
decel ... If this air circuit has some sort of leak you would get a lean
mixture ... perhaps this the valve is sticky or there's a small hole in the
hose that leads to the intake tract.

Steve Buchholz

-----Original Message-----

It will eventually recover at idle and read normal...then it will drop off
(like it stumbles a bit) and will read lean...then bump back into green
again. Pondering a couple of items including the WOT (have to test it
mayhaps tonite) and have a fuel filter to change (although not sure this
will be the case).  I'm missing a whole lot of go considering I have a big
spring and the GTQ chip now...when I first put the chip in the car felt much
faster..now after going to NGK BPR7ES plugs any missing is gone but power is
down a lot. Oh the joy.

-----Original Message-----
>> What would cause a lean condition at idle?  Under power everything reads
>> fine.let off the gas and itleans right out.
> 
> CIS cuts off fuel during coast-down.  I think it is triggered by the
> idle switch.
> 
> This applies to at least the MC in the 5kCST; dunno about the MC2.

I think it does, yes.  But it should go into closed loop once the plate 
drops all the way (or stops dropping...).  Does the MC2 have a 
potentiometer on the airbox?