Microsquirt issues..

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Sep 2, 2013 | 01:06 PM

superbean

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Microsquirt issues..

I just put together a 5.3 turbo on microsquirt and I'm having an issue with it running. It will fire up and idle (2000rpm) but every 5 seconds or so it has a flat spot in the duty cycle and it drops to 0 for a split second then it goes back up to normal, then again.

Any ideas where to start to track down why I would have an intermitten signal issue with injectors?

Sep 2, 2013 | 02:28 PM

aknovaman

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From: Hog Back, KS

Monitor battery voltage and see if it is jumping around. If so its likely a loose ground. Also use the tooth logger to verify solid crank position sensor output. O'reiley crank POSN sensors are prone to intermittent failures.

Sep 2, 2013 | 02:52 PM

superbean

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looking into that now. Also, do all sensors need to be physically grounded? I'm only getting continuity to ground from the two pins (grounds) for the microsquirt

Sep 2, 2013 | 03:41 PM

aknovaman

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From: Hog Back, KS

Make sure sensors are grounded as shown here. Crank posn can be grounded to main Micro ground. I don't recommend sing the sensor GND for it.

http://www.useasydocs.com/details/ew3_hires.gif

Sep 2, 2013 | 06:07 PM

superbean

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Ok i've redone the sensor ground (it had a bad cold solder connection). I am not sure if the Crank sensor ground is separate or if it its used in the sensor ground. Why do you recommend not using it in the sensor ground?