Still tweaking the engine for best performance. As you know, I have a FAST EZ EFI system. I swapped my OE distributor with a Pertronix and that made a noticeable improvement. This has a GM style adavance so is a lot easier to tune. I've been working with FAST on their help forum for the correct settings. However still running rough under load, and mpg is less than 13.
I opened up the distributor cap and found that the carbon button was worn to nothing. So I replaced the cap and rotor. No difference at all.
I analyzed using an oscilloscope and identical clamp type probes. One on the coil wire and the second on a plug wire. Here's a picture of representative results. It looks like I'm losing a lot of energy through the distributor cap. I did this with all eight plug wires and all results were similar.
Yellow is the coil wire and blue is a spark plug wire.
I opened up the distributor cap and found that the carbon button was worn to nothing. So I replaced the cap and rotor. No difference at all.
I analyzed using an oscilloscope and identical clamp type probes. One on the coil wire and the second on a plug wire. Here's a picture of representative results. It looks like I'm losing a lot of energy through the distributor cap. I did this with all eight plug wires and all results were similar.
Yellow is the coil wire and blue is a spark plug wire.
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