Hello! I just bought an 88 VW Fox wagon. Engine has been swapped with a 1990 Audi 80 1.8L engine. I am looking to make modifications on the car, and I want better airflow. The CIS Fuel distributor mounts on top of the air box, which I want to remove in order to install an aftermarket intake. I have never worked with CIS before, and I am fairly new to cars in general, so I was wondering how I can remove and replace the CIS fuel distributor with something else that doesn't mount on an air box. or if there is a way I can bypass it and mount it elsewhere?
Thanks chuck!
I understand that it is an important part, I think im just curious if there is a different type of distributor out there that doesn't mount on top of the air box?
No, the fuel distributor is combined with a flow sensor plate that measures airflow, which is used to determine the amount of fuel to deliver. So by definition it has to be placed in the intake airflow.
I've owned cars with CIS and thus have some familiarity with the system. Here's a generic diagram showing how it works. Note that the airflow sensor is integral with the fuel distributor. Your car will likely have detail differences but should be substantially the same:
Excellent, @chucktobias
Thanks! I've owned some older Saab models with this fuel injection system. Main difference in later CIS setups is the addition of a "Lambda" O2 sensor and electronics for emission control that fine-tunes the mixture. I'm 99.9% certain that a 1988 or 1990 model would have that. Major components and basic operation of the injection system is still the same though.
That's a mechanical fuel injection system and the fuel distributor is the heart of the system. If you want the car to keep running don't monkey around with it aside from maybe adjusting mixture if needed, and even that needs to be done very carefully.
Thanks chuck!
I understand that it is an important part, I think im just curious if there is a different type of distributor out there that doesn't mount on top of the air box?
The CIS system is the Bosch Continuous Injection System and relies on engine vacuum to lift a throttle plate diaphragm that moves plungers to increase fuel distribution. Messing with this system is a huge mistake.
