MicroSquirt.com read only forum (Jan.15,2018)

My microsquirt is killing my engine randomly. Some times it will run for a few seconds, some times a few minutes. It ran great last winter but this year it is having problems. I did some other work on the sled but don't know what would be causing the problem.

I have a data log showing what happened. Voltage dropped to 8 volts and IAT also dropped. The tach count reset to zero but the datalog time kept running. Is this an ignition reset? Any ideas why this would happen all the sudden and what could be wrong?

Thank you,

Hufferfuely

By the way...my next pulse tolerance is set at 90/60/40 for cranking/after start/normal running.

Yes the ecu lost synch when the voltage dropped to 8 V. But it did not reset, it just missed a tooth or tach pulse. The battery voltage stayed at 8V for almost a second and only then was synch restored. Normally when it misses a tooth at such high rpm, it is much less noticeable because it resynchs in a few ms because it has so many opportunites because the engine is turning so fast. Because it was running fine I am pretty sure this is an electrical problem. I would suspect the alternator or loose wire, bad solder joint.