Air,fuel mixture screw on top of cab cover April 10, 2026, 10:18:51 AM Hi everyone, I got a vw golf mk2 Driver 1990 1600cc cab.First question, someone fiddeled with the cab air/fuel screw on top of the cab cover, now it seems to use to much petrol,...How do you adjust it properly I tried a few times when car is hot but i-m un-sure if i screw too much or too less lol.Second question, for this car what should the idle RPM be ? I've seen some saying 800 to 850, others 900 to 950 ?What's best ??Thank you very much,Regards,Phil.
Re: Air,fuel mixture screw on top of cab cover Reply #1 – April 13, 2026, 01:36:22 PM The mixture screw on the top of the pierburg carb only adjusts the mixture at idle for emissions purposes. It works the reverse of most carbs i.e. to lean the mixture you screw it out (anti clockwise) and to richen it you turn it in (clock wise). If you car is running rich, the mixture may not be the cause. Make sure the choke is fully off when the engine is hot for example. The idle speed should be 850-900rpm, when fully hot. There are a number of way of adjusting the idle speed, some which are incorrect, but people do it anyway. I suggest down loading the pdf of the manual for the correct way of adjusting it.
Re: Air,fuel mixture screw on top of cab cover Reply #2 – April 13, 2026, 02:33:14 PM Thank you very much, yes there are so many ways to adjust cab that i've done in the past. As you mention people fiddle anyways wrongly . I will try again and do it properly. Thank you for the RPM, this is what i beleived,....Thanks again.
Topic: Air,fuel mixture screw on top of cab cover (Read 84 times)
previous topic - next topic
