But this means idle is approximately stable enough to permit me to check and adjust timing. Once the truck warmed up it was idling all on its own (not well, but still.) Pretty happy about that! Clearly open loop is whacked out. Wouldn't be too hard or costly to build my own circuit board. Will have to test long term once I get this thing on the road. Was able to collect about 3 minutes so far. Data logging works at idle and engine off. :) I was able to collect data during idle for about 30 seconds before TunerPro reported a data error (loose wiring, probably).ĮDIT: it was a ground issue. There may be a ground issue at play but need to investigate further and eliminate loose wiring. I thought it'd be interesting to try and buffer the signal with a PNP and was able to look at waveforms in that case. I broke out my o-scope to look at waveforms, looked fine whether vehicle running or not so that wasn't the problem.
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