Warm Engine Idle Issue



The best way to set power valve opening is by measuring intake vacuum at a cruise. Not idle. What ever cruise vacuum is, make the PV open 3-4 inches later. For example, if you cruise at 16 inches, a 10.5 PV is what I'd use. You will probably be able to pull one or two main jet sizes out when you get the PV opening at the right time.


To test the fact that the PV does zero at idle, just take it out. It will not affect idle one bit. You can take the main jets out as well and it won't affect idle.

So set PV open to cruise vacuum not idle vacuum.