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RE: [T3] Another rough running engine...Update..clarification


Just to clarify...

>checking I unplugged the temp sensor on top of the oil cooler (oil temp
sensor?)
 
I just got done searching to define this part.  It is the Oil Pressure
switch that receives current from the Automatic transmission and is part of
air regulation.
The Volkswagen Service Manual on vwtype3.org tech section describes it as:
"On 1972 models, additional air is injected to lean the mixture during
coasting rather than cutting off the fuel supply. Figure 34 shows the system
used on models equipped with a manual transaxle. When coasting, the throttle
valve closes and a high depression (vacuum) exists in the intake air
distributor. This vacuum operates a valve (1) which opens and admits air
from the air cleaner around the throttle valve to lean the mixture. 
A slightly different valve is used on models with automatics. An oil
pressure switch on the automatic transmission generates an electrical signal
to open the air valve. Otherwise, operation and function of the valve is
identical to that on manuals."

Jason Smith
'72 Fastback FI AT
'97 Jetta
jasontsmith@alumni.pitt.edu
http://jasontsmith.tripod.com/vw.htm
 

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