Personal E4ME adjustment

[MRCHEVY]

I have an 86 Monte Carlo with a stock 305 and a E4ME Rochester. I want to find out personal idle mixture screws and APT adjustment turns from being bottomed out that worked flawlessly for you? My timing is at 8 btdc

 

[Bonnewagon]

APT is set at the factory and should never be touched without recording how many turns it takes to bottom it out. Then you can match the factory setting. The idle mixture screws are also set at the factory and should never be touched without bottoming them for a reference point. The manual describes a propane enrichment procedure for idle adjustment that I have never seen performed. That said, I like between 3.5 and 4 turns on my APT. I have found that the idle screws can be richened up quite a bit and the computer will deal with it. I have found richening really smoothes out a crappy idle, but there was probably a vacuum leak I was unaware of. A vacuum gauge hooked up to manifold vacuum will help you find the best idle adjustment. All motors are different and no one can tell you,"do this many turns and expect that". Once you ditch the factory settings, you must experiment to get back to the best setting for your motor.