Rev counter signal
09 December 2010, 05:49 PM
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Rev counter signal
where does the rev counter get its signal from?
car runs like **** when at about 3k rpm, but noticed tonight the rev counter fluctuates quite rapid when at said rpm... thinking it could be a cam or crank sensor fault.
did i read some where that all cylinders dont use the same sensor to fire coils/injectors? ie cylinder 1 & 3 use crank sensor then 2 & 4 use cam sensor? or have i made that up?
95 wrx btw
car runs like **** when at about 3k rpm, but noticed tonight the rev counter fluctuates quite rapid when at said rpm... thinking it could be a cam or crank sensor fault.
did i read some where that all cylinders dont use the same sensor to fire coils/injectors? ie cylinder 1 & 3 use crank sensor then 2 & 4 use cam sensor? or have i made that up?
95 wrx btw
09 December 2010, 09:21 PM
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Rev counter gets its signal as an output from the ECU based on the crank/cam sensors.
The same sensors are used by the ECU to control ignition and fueling to all 4 cylinders.
Checked your coilpacks for cracks? They are a big cause of misfires especially when coming onto boost which is at ~3k. A misfire would cause a fluctuating RPM.
The same sensors are used by the ECU to control ignition and fueling to all 4 cylinders.
Checked your coilpacks for cracks? They are a big cause of misfires especially when coming onto boost which is at ~3k. A misfire would cause a fluctuating RPM.
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