Idle Mixture w/FI
Posted: Sun Apr 20, 2008 7:11 pm
I got a BIG improvement in the "stinky rich" smell I used to have at idle when I went back to the stock cam and close to the stock CR.
But, my idle still smells a bit rich (no catalytic converter), so I thought I'd try out the CO meter I bought off eBay last year to dial in the idle mixture.
The sticker on the engine lid says 1% CO, but that's for a '78 California model and I'm running an ECU from a '77 49-state model. (I do have the original '78 California ECU that I could put back in, though.)
The best I could get on the meter was 3.5% CO, and I must have the bypass drilling in the AFM wide open because further backing out of the mixture screw makes no difference. It still smells a bit rich, but maybe that's just the way it is going to be with this ECU and no cat. converter.
Were these engines being "coerced" into running lean at idle? I moved the AFM wiper just to see where things stood after the adjustment and the idle speed went WAY up when I moved the wiper in the "more fuel" direction.
Thoughts?
But, my idle still smells a bit rich (no catalytic converter), so I thought I'd try out the CO meter I bought off eBay last year to dial in the idle mixture.
The sticker on the engine lid says 1% CO, but that's for a '78 California model and I'm running an ECU from a '77 49-state model. (I do have the original '78 California ECU that I could put back in, though.)
The best I could get on the meter was 3.5% CO, and I must have the bypass drilling in the AFM wide open because further backing out of the mixture screw makes no difference. It still smells a bit rich, but maybe that's just the way it is going to be with this ECU and no cat. converter.
Were these engines being "coerced" into running lean at idle? I moved the AFM wiper just to see where things stood after the adjustment and the idle speed went WAY up when I moved the wiper in the "more fuel" direction.
Thoughts?