75 idle issue/ bogs down when gas is pressed
Thread Starter
3rd Gear
Joined: Jan 2015
Posts: 3
Likes: 0
75 idle issue/ bogs down when gas is pressed
Working on a 75 for a friend of mine has the L-48. It idles pretty rough, I'm guessing vacuum issue cause there are a lot of vacuum hoses missing. And also when you hit the gas hard from a dead stop it bogs down almost shutting off then finally goes...need some help.
Instructor
Joined: Mar 2013
Posts: 180
Likes: 21
From: Chesterfield Mo
Assuming no vacuum leaks, timing set to spec and stock Quadrajet, idle needs to be set at 600 RPM and idle screws adjusted for highest steady vacuum. Should be out about 2-3 turns. If idle raises above 600 readjust and repeat idle screw procedure. Bog off idle can happen when throttle plate is too open allowing too much air making idle screws unresponsive. Transition off idle circuit to primary circuit will be off.
Bog could be accelerator pump shooting too little or late but try idle screw adjustment before anything else.
