- Sat Aug 12, 2023 10:25 pm
#64369
Getting back on this once again.
Last time I started the car, I think I was still chasing my tail with the ignition even after setting the timing to a verified 10°BTDC. Realtime monitor in TS was showing engine RPM jumping all over the place, and the idle was rough most likely because of that. I'd originally failed to run shielded wire to/from the ignition system, stupidly hoping I could get away with it because I didn't have any shielded wire on hand larger than 23GA. This was clearly wrong. That part of the harness has been replaced with shielded 4-conductor 18GA wire. Shield is tied to the sensor ground of my NO2C Speeduino, and shielded wires are now connecting distributor points to VR1+, IGN1 to PRW-2 module, PRW-2 to coil and PRW-2 to ground though I realize that last is probably overkill but it was easier than trying to separate the old ground wire from the rest of the old wiring.
Once that was rewired, it started fairly easily, idles and runs OK and doesn't try to stall out/fall on it's face when I put the transmission into R or D. I'd like to get the idle speed up a bit from where it is without resorting to something crude like the throttle stop screw, and I can tell it needs work on the fueling because I can smell richness in the exhaust plus the realtime monitor was showing AFR in the 11-12-ish range.
Still, best it's run so far. I took a bit of a log at idle so y'all can see what it's doing, attaching it here with the current tune.
Last time I started the car, I think I was still chasing my tail with the ignition even after setting the timing to a verified 10°BTDC. Realtime monitor in TS was showing engine RPM jumping all over the place, and the idle was rough most likely because of that. I'd originally failed to run shielded wire to/from the ignition system, stupidly hoping I could get away with it because I didn't have any shielded wire on hand larger than 23GA. This was clearly wrong. That part of the harness has been replaced with shielded 4-conductor 18GA wire. Shield is tied to the sensor ground of my NO2C Speeduino, and shielded wires are now connecting distributor points to VR1+, IGN1 to PRW-2 module, PRW-2 to coil and PRW-2 to ground though I realize that last is probably overkill but it was easier than trying to separate the old ground wire from the rest of the old wiring.
Once that was rewired, it started fairly easily, idles and runs OK and doesn't try to stall out/fall on it's face when I put the transmission into R or D. I'd like to get the idle speed up a bit from where it is without resorting to something crude like the throttle stop screw, and I can tell it needs work on the fueling because I can smell richness in the exhaust plus the realtime monitor was showing AFR in the 11-12-ish range.
Still, best it's run so far. I took a bit of a log at idle so y'all can see what it's doing, attaching it here with the current tune.
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