lumpy tickover

hi guys,
 does anyone know of an easy way to adjust the co2 mixture on the 1983 1.8mk1 gti. shes running rich on tickover causing her to rev at about 500rpm and is hunting if you know what i mean?
 i know where the adjustment needs to be made on the air flow meter etc but do i need a special vw tool or will a small allen key/screwdriver work?
 
 any ideas would be much aprehciated.
 cheers

Mine's exactly the same on tickover, and also judders and splutters a bit at low RPM when driving as well, which i think is a fueling problem.

No idea what tool you would need to do the adjustment, i tend to leave all adjustments to the fuel system to the experts, as I've never had much success adjusting fueling levels in the past, and normally make the problem worse!!

Mike.

Adjustment is via an Allen key - 3mm I think… It needs to be quite long though to reach down inside the guide tube.

As you insert and apply pressure to turn it, you are actually forcing the metering plate in to it's closed position so the car may stall. Turn it in small amounts of about 1/8th of a turn at a time and allow engine to settle.

Are you sure it is a rich mixture and not just your idle setting?

cheers for the quick replies dudes.
 i will give it a tinker 2nite, any ideas on which way i turn it?
 silly question i know!

Jon-Boy said

ideas on which way i turn it?
 silly question i know!

Not so silly as i'm not sure! ops:
I think it is the opposite to the way you would expect,
ie. clockwise richens and anti-clockwise leans.

ok, well im sure i will find out when i turn it the wrong way and it cuts out! :roll:
 will let ya know. fingers crossed!

Clockwise for richer, antiC for leaner

sweet,
 all sorted ticks over sweet as a nut to a nice burbling exhaust note!
 rock and roll.
 cheers for the advice it was a mixture of the idle and co2.
 i think someone had over compensated for the low tick over with an increased idle speed. but all sorted now.
 
 cheers lads

Good stuff!

nice one