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Old 06-13-2019, 03:34 PM   #1
Join Date: Jul 2015
Location: San Luis Obispo
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MegaSquirt losing crank signal

I recently installed a new 2.9L M20 with Microsquirt v3.0. I'm using the stock 60-2 toothed wheel and having an issue with the crank position sensor at higher RPMs. Once I hit around 3500 RPM, the engine acts like it's bouncing off a rev limiter/fuel cutoff. The tooth logger shows I'm completely losing the signal and counts as a loss of sink. I bridged the shunt resistor in the case, moved the CPS bracket closer to the wheel, and swapped out CPS sensors with another used one.

Any ideas what I should try to check next?

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Old 07-16-2019, 05:57 AM   #2
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Do you have a new sensor? I have heard MS is pretty picky and that they benefit from having a Bosch sensor. I have seen others use a decent brand one, but swap to a new Bosch and the issue is resolved.

At a guess though.
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