I know, I'm bouncing back and forth troubleshooting. I figured I'd give the Edelbrock a shot again since it was somewhat of a known quantity. I had it idling and running fine, then all the sudden it acted very lean at idle and with my foot on the gas. Wideband read like 14-15:1 when I limped it back home after the test drive. No clue why when I started driving it had enough fuel then all the sudden went lean. Maybe I've got a vacuum leak.
I'm pulling the dizzy. Takes 5 minutes to check. Plus I've been meaning to slow the curve a little more on it, so it needs to come out anyway. It's a Proform model that I put in when I pulled the stock Spark Control Computer. I have read that Proform basic dizzys aren't the best, so maybe I've worn mine out already and it's giving me inconsistent or weak spark.
I understand that the speed screw and the transfer slots need to be adjusted. Before I made a post I spent a bunch of time adjusting the idle speed screw and the mixture screws. The thing that throws me off is that if I keep the speed screw open more than a turn, it will still run with the idle mixtures shut or barely open. I think it came out of the box open 1 to 1.5 turns. The way I understand the idle bleed screws is that they feed the circuit and the idle mixture screws fine tune the circuit. Still wondering if they idle bleeds need to be dropped another size or two.
Please see the attached pic. The red circle on the base of the carb shows where to adjust the secondary butterflies. They did stick too far closed, so I turned the screw enough where opening the secondaries felt smooth. But the slots are still covered 100%. It is a mild cam and when this thing ran well before I got water in the gas vacuum was up at 18-19 ad idled very smoothly. Now it's been idling with a slight RPM variation.
Timing is on the list to play around with still. But I feel like this thing should run somewhat well with initial timing anywhere between 8-16ish, based on tuning the Edelbrock 2 years ago when I put the 4 barrel on.
So for the primaries, by turning the idle speed screw, you are essentially showing more or less of the transfer slot. Only way to see how much is to pull the carb. On my Summit carb, there's a secondary adjustment screw on the bottom of the carb. Turn it in and it opens the secondary butterflies a bit and the transfer slot will start to appear.
Yeah, I thought about that. Current gas is 89 octane (whatever the ethanol content is) with Stabil. Probably a month old mixed with older gas that was left in the tank. So it could be a gas issue. Maybe I'll pull a sample and see what it looks like.
Pics. First is secondary adjustment screw. Second is the carb for reference. Third, with the red circle above the butterfly, is a hole that starts to be shown with the idle speed screw one turn out. I have no idea if this hole should be exposed at idle or not. Fourth is the amount of transfer slot shown with the speed screw all the way out and the fast idle cam out of the way.
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