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Summary of change:
VW 4 cylinder engine with distributor. Hall Effect sensor with 4 window wheel in distributor used for triggering. Distributor used for ignition, Stepper A to single Ignitior/Coil. The issue is: '''RPM value drops very low every few seconds'''. Does it also misfire / bog than ? Or apparently runs fine ? Tried using 5volt and 12volt supply for the Hall Sensor, same results. '''Experiment''' * pull down HALL sensor input to GND with a known (eg. 1kOhm) resistor and measure DC voltage ** than calculate the measured internal pullup resistor value (depends on order options and order comment but normally around 2k7) ** We've seen a Crysler HALL sensor where 2k pullup (during initial measurements of the engine tried to pull the signal up with a hack: the TPS sensor) was too low to trigger reliably (but 2k7 was OK). ** Maybe this requires higher 4k7 or 10k internal pullup ? Would be nice to measure with scope '''when the problem shows up'''. Vemslog: http://www.vems.hu/files/KevinBlack/CSP%20Corrado%20New.vemslog
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