View Single Post
  #9  
Old 08-18-2020, 10:02 AM
Tom Vaught's Avatar
Tom Vaught Tom Vaught is offline
Boost Engineer
 
Join Date: Dec 2001
Location: The United States of America
Posts: 31,304
Default

Quote:
Originally Posted by Cliff R View Post
Any time you experience high idle and lack of control of the idle speed and have ruled out any vacuum leaks, or sticking/stuck throttle plates check the timing.

I get a LOT of vehicles brought here with similar issues and often there is a little "creep" in the timing curve allowing some timing that doesn't fall out when the engine comes back or tries to come back to idle speed. This makes idle tuning and engine speed control difficult if not near impossible.......Cliff
Agree, Timing and how the advance curve is set-up can cause lots of "ASSUMED CARB ISSUES". The use of very soft Mr Gasket "HOT ROD" springs being one of them. Touch the throttle and you get a big leap in timing. (engine rpm)

Tom V.

__________________
"Engineers do stuff for reasons" Tom Vaught

Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward.