Cold idling problem

[alves at email.unc.edu (Carlos Alves)]

Hmmm, I am almost positive there are no other leaks in the system, I 
checked most of the lines earlier today. What makes me think it is the 
missing thermoswitch specifically is that my car did NOT do this idling 
problem before I was messsing around around the intake area when 
replacing my distributor and lost the switch. Also, my car only does 
the stalling/idling problem when the car is cold, when it warms up, it 
revs and idles fine, albeit a little 16vish waiver. What I am thinking 
is the thermoswitch senses that the temperature is low and tries to 
divert the airflow from the missing thermoswitch, opening up the valve. 
I think this is what may cause my car to starve for air when it is 
first warming up. Can anyone verify this? 
Also, should I literally just plug up the port to the preheat valve and 
from the manifold? I removedhe manfiold vacuum line and plugged it up 
and the problem got a litle better, but i havent tried getting around 
the preheat valve line. 

What does anyone think?




Quoting Julie Macfarlane <juliemac57@hotmail.com>:

> This has me a bit confused. Most people have removed the air diverter
> from 
> the bottom of the air box with out problem. I never installed one on
> my car.
> 
> Check for leaks in other locations. Especially after the air flow
> plate (The 
> big rubber thing), then the hose to the throttle.
> 
> At idle the air pressure should be about 14"HG (if you have an vac
> meter). 
> You could also try spraying carb cleaner along sections. when the
> motor 
> revs, theres your leak!
> 
> good luck.
> 
> 
> 
> Julie Macfarlane
> 1981 MKI 2L 16v w 2Y
> Amsterdam NY
> http://www.menloparkrandd.com/scirocco
> http://www.menloparkrandd.com/my_rocc
> 
> 
> 
> 
> 
> >From: T Berk <tberk@sbcglobal.net>
> >To: Carlos Alves <alves@email.unc.edu>
> >CC: scirocco-l@scirocco.org
> >Subject: Re: Cold idling problem
> >Date: Fri, 11 Jun 2004 16:43:24 -0700
> >
> >Carlos Alves wrote:
> >
> >>I am having a really weird problem with my 16v. Ever since I
> accidently 
> >>removed and lost the vacuum thermoswirtch to the preheat valve on
> the side 
> >>of the intake boot, it has been idling really weird. Currently,
> when you 
> >>start it up and the engien is cold, it sputters below 1500 rpms, it
> 
> >>definetley sounds as if the engine is not getting enough air,
> possibly due 
> >>to the vacuum leak to the preheat valve.
> ><snip>
> >>On a side note, I also noticed that the air intake tube on the
> bottom of 
> >>the engine is severely cracked. Would htis affect the idle only
> during 
> >>cold starts? Is it the cold start valve? Anyone have a clue?
> >>
> >>Thanks,
> >>Carlos
> >
> >Carlos,
> >
> >ANY vacuum leak between the motor and the throttle will cause
> trouble. As 
> >the extra air is discovered causing a lean condition the car will
> try and 
> >compensate.
> >
> >Fix dem leaks man.
> >
> >
> >TBerk
> >
> >
> >_______________________________________________
> >Scirocco-l mailing list
> >Scirocco-l@scirocco.org
> >http://neubayern.net/mailman/listinfo/scirocco-l
> 
> 
> 



Faster than a speeding pinto...... 
Coches