Holley 885 Idle

Holley 885 idle system

Fuel enters the idle circuit through the main jet and moves through the idle tube. Fuel is pulled by vacuum, which is at it’s highest at idle speed. 

Rough Idle?
Make sure the idle air bleed, idle transfer hole and the idle discharge hole are clean and clear.
Adjust the idle mixture only at idle speed. Once the RPM gets over idle speed, the idle circuit is bypassed.
To adjust the idle mixture attach a vacuum meter to either the carburetor, or intake manifold and adjust for smooth idle at the highest vacuum reading.

Updated on 01/09/2021

Was this article helpful?

Related Articles

Need Support?
Can't find the answer you're looking for?
Contact Support