Help Needed the Chemo has Fried My Brain

cole930 · 12-15-2008, 06:26 PM

Alright;
I'm brushing up on the operation of the K- Jetronic CSI and it's associated components. I'm going to order a Digital WUR for the old sled and thought refreshing my memory might aid in the installation and tuning, as it has been a while.

I have never been one to just accept something as fact without understanding why. In Geometry Class when the teacher said pie R square; I said pie R not square, pie R round, cornbread R square. Which brings me to the question.

When the engine is started and air begins to flow into the engine the sensor plate is "lifted" Does it not seem logical the sensor plate would be drawn downward with the intake of air, not lifted? In V6 and V8 engines the sensor plate is drawn downward. Please explain !!!!! I just have to know.

THANKS !!!
Cole

cl8ton · 12-15-2008, 07:27 PM

Well for any air to flow the plate would have to be forced downward?
Upward movement would cut off any airflow!

Are you talking bout this plate

cole930 · 05:19 AM

Yes Rod Thats the one.
The Bosch book states " When the engine is started and air begins to flow into the engine, the airflow sensor plate is lifted" I'm certainly glad you answered as you did, I thought I was nuts. Obviously it doesn't make sense to you either.
There is something we are missing here.

THANKS !!!!
Cole

RarlyL8 · RarlyL8's Garage

The airflow sensor plate on a 930 is backwards in flow to a 911. On a 911 the air flow plate is in fact lifted.

e p slick · e p slick's Garage

Bosch Fuel Injection & Engine Management book has helped me understand the very basics of CIS. Now that I understand its simple mechanics I like it quite a bit (Shows how un-sophisticated I am). You can most likely find one on Amazon at a great low dollar price. I believe mine was bought and delivered for less than $10.00.

EP Slick the simple - Tucson

beepbeep · 12-16-2008, 07:38 AM

Craig 930 RS · 12-16-2008, 10:38 AM

Well here you go - check out my guide:

cole930 · 12-19-2008, 01:48 PM

To All,

I appreciate all the input to reconcile my confusion the with sensor plate
direction of movement. I finally found the answer. On applications where the sensor plate is lowered instead of raised when air begins to flow it is because
the control plunger is located on the opposite side of the fulcrum. I was looking at it as a function of air flow when it is actually a function of mechanics.
More proof of the truth in Goran's reply to my post

THANKS !!!!
Cole