View Single Post
  #212  
Old 08-20-2014, 02:38 PM
Franklin2's Avatar
Franklin2 Franklin2 is offline
Moderator
 
Join Date: Jan 2001
Location: Staunton VA
Posts: 32,577
Franklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant future
You can use a vacuum gauge if you like, I am not arguing that point. But what makes good vacuum? The faster the engine runs, with the butterflies closed as much as they can be.

What I am saying is you can "hear" what the vacuum guage would tell you. You adjust the the mixture screws till it runs the smoothest/fastest, and then adjust your idle speed if you need to. Then you adjust the mixture screws again, and tweak the idle speed if needed. When the engine runs the smoothest and highest rpm, and is at a reasonable idle speed, that should be the highest vacuum reading. Tuning by "ear" like this gets you very close.
__________________
Dave F

1989 F250 XLT Diesel
Reply With Quote