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

Well if it work on stock I agree there shouldn't be an issue. But until it is pinpointed I'd stick with resistor plugs. Small sacrifice for not having to replace a ICM over and over.

As for the real issue I'm nut sure where to check next. I think we need to get one of the pro's attention to this ...

I hope it is the plugs. You need resistance in the plugs and wires or the current on spark can get very very high and burn up coils or ICMs. So this seems to fit your discription.

A.J.

You shouldn't be tieing any wires together. As for the exact colors I'm not sure. You really need a schematic of that unit. Go by that.

A.J.

Well I know how you feel considering I had lots of problems with the IAC till it was fixed. Let me ask you this...... Are you using stock plugs and wires? If not what? Also, how is your ignition output on your MS internally wired? Directly to the processor port or through the high current ignition ...

I'm speaking of the tach problem. Reloading my old beta firmware and msq file correct everything back to the way it was.

A.J.

Well having dwell under .5 ms I'd expect that to happen. The signal with those setting switches on and off so quickly the ICM may not be able to get a good read and it wold be more likely prone to interference. When you are changing the dwell and spark duration what you are actually doing is ...

FYI......

I just tried to update my beta firmware from 2.684 to 2.686t5 and I had the same issue. I simply reflashed back to 2.684 and loaded my old msq and everything went back to normal. I attempted the new code load two times with no luck. It may be the old msq save is not 100% compatible with ...

teb,

Do you notice any changes in your car when you play with the dwell and spark time values? What are your settings now so we can compare?

A.J.

Alright then.......
1999 Saturn SC2 1.9L DOHC 4 cyl NA MS II Blue Processor w/ 2.686t5 Beta Code V3 PCB MegaTune 2.25 Innovate LC1 WB O2 Sensor OBD I Saturn Wasted Spark DIS w/ Cooling Fan and IAC


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Alright then.......