Golf 1 Cabrio, JH Motor, Year of Manufacture 1987, KA-Jetronic

Hello forum, the CO2 adjustment screw is located in a hole between the metering valve and the choke plate.
However, this vehicle does not have a hole; instead, there is a circular indentation in the casting.
I have read that on some vehicles, a hole is drilled for the CO2 adjustment only after the marking is made.
Can someone confirm this? Thank you for your help.
Hello Wolfgang, and have a wonderful Pentecost!

Hello,

One thing to note, I've never heard of a KA-Jetronic...

If it is a KE-Jetronic (Continuously injecting, Electronically controlled), then an electrohydraulic pressure regulator is mounted on the metering valve.
From this pressure regulator, which functions similarly to a nozzle-impact plate system and is electrically controlled, the mixture enrichment factor varies linearly.
On the mounting arm of the flow sensor, there is a potentiometer that measures the displacement of the flow sensor and, consequently, the amount of air sucked in, and sends this information to the MSG.

D.h. a manual adjustment of the fuel mixture control screw, as was possible in a purely mechanical K-Jetronic, is not possible at all in a KE-Jetronic.
since this task now also takes over the electro-hydraulic pressure controller and the potentiometer.
Therefore, Bosch has opted out of the opening, as it is simply not necessary.

Wishing everyone who is reading this a relaxing and enjoyable long weekend.

Best regards, Richard

Thank you, Richard, for your response.KA-Jetronic is purely mechanical (analog). KE-Jetronic came later. Greetings, Wolfgang.

According to Bosch's technical documentation, the "A" stands for "Non-driven", but this was never officially used as a designation, as all K-Jetronic injection systems
"Regardless of whether it's K-Jetronic or KE-Jetronic, the engine will feel sluggish."

In contrast, components like Kugelfischer injectors, diesel inline injectors, or VEPs are driven by the engine using a timing belt/gears.

Schmierpfote wrote:

KA-Jetronic is purely mechanical (analog). KE-Jetronic was introduced later.

In terms of meaning, I haven't written anything else above

E30_V8 wrote:

This means that a manual adjustment of the fuel mixture regulating screw, as was possible with a purely mechanical K-Jetronic system, is not possible with a KE-Jetronic. since this task now also takes over the electro-hydraulic pressure controller and the potentiometer.

Best regards, Richard

Hello Richard, the Golf has a mechanical KA-Jetronic fuel injection system, manufactured in 1987, with a JH engine.
I have replaced all the brake and fuel lines, the tank, the water pump, the ZR (presumably a part), etc. The Golf belongs to a relative, and I have got it running again. I have no idea what modifications the previous owners made. Thank you, Wolfgang.

Hi,
A cautious objection: We had an Audi 80B2, CC, manufactured in 1985 with 90 hp and KE-Jetronic (control unit, 4 injectors, originally with a regulated catalytic converter in the accompanying documentation). Motor likely JN.
Between the air filter and the distributor, there was an air flow meter (with a metal housing) with a valve and potentiometer, and under a metal plug, an adjustment screw that, according to Etzold, was described as an adjustment screw for idle speed and CO (?), (as far as I remember). The plug had to be drilled. I only drilled it and pulled it out with a screwed-in screw. The action at the time was actually pointless; the poor idle speed was caused by a small leak in the coolant temperature sensor and incorrect temperature measurement. I hadn't encountered "blinken" before.
hg
Herbert

Thank you for your responses.
I have taken a Screenshot. The Allen key is inserted into the hole of the CO2 screw. Greetings, Wolfgang