CarburetorsCarb discussion and questions. Upgrading your Third Gen's carburetor, swapping TBI to carburetor, or TPI to carburetor? Need LG4 or H.O. info? Post it here.
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Need help getting the idle setting perfect on Holley
Carb is a Holley 4777-7 650 double pumper and it is jetted right and the engine is timed properly. The car idles fine at 14-15 inches Hg @ 900 rpm. the only problem is that my exhaust smells strong at idle. I have a Vacuum gauge and an A/f ratio gauge.
I would like some input on how to properly adjust idle circuit. I kind of just turn the two screws til it starts to die then I back them off until it sounds fine. Is there a way to do it with a vacuum gauge?
__________________ 1991 Camaro Z28
L98 G92 Performance Package
All stock
ET 14.7 @ 93.2 MPH 1.91 60' in Albuquerque, NM Elev 5400 ft.
Dyno 231 RWHP 332 RWTQ
Set them for max vacuum; then shut the car off, average teh number of turns from the bottom for both of them, then set it for max vacuum again; if you move the screws much, shut it off and average them again, and reset for max vacuum.
You want the screws the same # of turns out, with max idle vacuum. If you had an auto you'd probably want to do it in gear.
__________________ "So many Mustangs, so little time..."
