[68gt500]

I am pretty sure, that the Weber tuning guide suggests to have the idle screw open about 3/4 of a turn to 1 turn.

On my car, the best idle is achieved at about 3/4 turns open, but that setting leads to exhaust popping on deccel and ocasional light "sneezing" at cruise .

Opening them up another 1/4 turn gets rid of the popping and sneezing.

My take is that the idle screw does have a noticeable effect as long as the car is running on the idle circuit. (up to maybe 2600)


The five biggest improvements were:

- getting, reading & kind of understanding the Weber Tuning Guide

- reading Eljaros Posts

- documenting each change in an Excel table

- Drilling the 3rd progression hole

- Opening up the venturis to 40 mm