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Idle speed tuning

Tiny
JKEEPER
  • MEMBER
  • 1979 PONTIAC FIREBIRD
  • 70,000 MILES
I have a 1979 firebird. I need to adjust the idle speed and run it a bit. It is a 301 with a 2 bbl carb. I would like help on why the setting should be and which each adjustment on the carb is and does.
Saturday, December 31st, 2011 AT 1:53 AM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
You need a tachometer

Close the A/F mixture screws and back both of them out 2 turns and then close the idle speed screw and then turn idle screw 2 1/2- turns-now start car up-make sure its idling at 600rpm-if okay start closing the mixture screws one at time till the engine starts missing then back it out 1/4 turn do the same for the other-when this done start adjusting the idle spped screw till you get 600rpm- or higher as you wish
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Saturday, December 31st, 2011 AT 2:05 AM

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