Re: '56 Rochester 4GC

Posted by Ross On 2012/11/1 10:36:22

I use the method preferred by all the other old farmers like myself: You turn the screws to obtain the best, smoothest idle, and that by ear.

With the car fully warmed up, I do one side at a time: turn out 1/4 turn. Listen. Better? Turn out another 1/4 turn. Repeat til it starts to sound worse. Turn back in til the best idle is achieved. Reset the idle speed if it is now racing. Now do the other needle the same way. Reset the idle speed if necessary. To be sure, repeat the whole procedure for both needles and reset the speed one last time. The whole thing takes 3 minutes.