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Definitely not 5 ohms.
Could you post a picture of the new potentiometer?
With the typical potentiometer and the EC2 powered, you should measure 0 volts on the one side, +5V on the other, and 0 to 5V on the center pin as you turn it through it's range.
If really 5 ohms, I suspect it would almost short out the power supply in the EC2 and.or the potentiometer burn up. (5 watts being dissipated in it).
Unfortunately, in all the data I got from Tracy, I never did find a schematic of the PCM.
Finn
On 11/16/2020 3:39 PM, David Leonard wdleonard@gmail.com wrote:
Hi All,
I have just completed an engine rebuild. This issue was caused by a crack in the T2 exhaust manifold that melted a coolant line and a fuel line, causing an engine fire.
I landed safely and had to rebuild the engine because the o-rings melted from the coolant loss.
Im trying to get the new engine running again. Compression is great, spark is great and I have triple checked the timing. I am getting some amount of fuel but no combustion. I have narrowed the problem down to a few possible issues.
During the rebuild I replaced the 5ohm potentiometer that controls the mixture because the knob was broken off. So I possibly mis-wired the replacement potentiometer, it is not actually compatible, or I damaged the board when I trimmed it to allow the new one to fit. I wonder if anyone has one lying around I could borrow to test this link in the chain.
Thanks
Dave Leonard
Turbo 13B RV-6
858-254-3357
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