[DML] Re: High Idle Issue

["Dave" <v-davidj@xxxxxxxxxxxxx>]

Hey Mike...

I have had this problem with my car for a while now and was convinced
that it was a vacuum issue.  I didn't discover the real problem until
I installed a air/fuel meter (for the Turbo) on my car.  My O2 sensor
wasn't working correctly and was giving eratic readings.  This was
causing the Frequency valve to run constantly.  That caused a high
idle and sheety (so very sheety) gas mileage.

So a quick test, run your car to operating temp.  If your frequency
valve is still running, it could possibly be your O2 sensor.  Unplug
the Frequency valve...if you car idles normally...that's most likely
the problem.

Hope this helps!
Dave Jacobs

--- In dmcnews@xxxxxxxxxxxxxxx, "Mike Polzin" <MPolzin@xxxx> wrote:
> 
> Greetings everyone,
> 
> It spring so I am back to working on my cars again. I have an '81
5-speed that has a high idle condition. Last fall I suspected that the
idle speed motor on the car was faulty because when I banged on it a
bit the idle on the car would go down for a little bit. The car was in
generally idling around 2000+ RPM's when warm, and sometimes upwards
of 2500 RPM's if I was driving around for a bit.
> 
> Well I replaced the idle speed motor (thanks Toby!) and the car is
still idling high, however it now seems to max out around 1700 RPM's
warm, so there is an improvement and I think the idle speed motor was
part of the problem. I backed of the idle screw on the throttle but I
can't go any further down at this point, so it isn't an adjustment.
> 
> What I noticed was that when I pushed in the clutch I could hear a
slight "woosh" sound and the motor would idle down to about 1500 RPM's
by simply doing this. I did not put the car into gear.
> 
> Also when I turned on the heating/cooling fans inside the car the
car would idle up about 100 RPM's. 
> 
> I pulled off the hose that goes from the oil fill to the air filter,
which made no different in the idle, however when I blocked the hole
on the oil fill cover the idle dropped by about 200 RPM's.  
> 
> All of this leads me to think I have a vaccuum leak somewhere
causing the high idle. I have looked for it by spraying some carb
fluid around some of the common leaks around the intake, but couldn't
find a leak there. I know there are other places to look, can anyone
advise? Or is there anyone in the Wisconsin or northern Illinois area
that would be willing to assist me in locating this? Thanks much!
> 
> Mike Polzin








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