MSefi.com read only forum (Jan.15,2018)

here is what the inside of my distributor looks like.



i only have 4 vanes inside, which i think corresponds to a cylinder for each. on the pic the "cylinder 1" vane just passed the sensor.

I just thought of something... Just take note, all we have is a camshaft position sensor and a distributor.

Mechanically, a straight 4 cylinder fires in a 1 3 4 2 manner. For every 180 degree turn, 2 piston pairs are in TDC - one just came from intake going to combustion, and the other just came ...

Well, the camshaft and distributor are fairly well tied to the crank, just turning half as fast - two crank revs per cam rev. If the cam is say 30 deg BTDC for a particular piston, then the crank is 60deg BTDC for that piston. Since the cam turns once per engine cycle, you know which piston is ...

Hi,

I've uploaded the circuit of my distributor.

Notes:
- Engine DOES NOT have a crank angle sensor
- Engine uses a distributor for spark plug firing
- From the excerpt in the service manual, this engine IS fuel injected sequentially

The oddity here is that, how does the ECU determine the ...

With that setup (no crank sensor, one signal per piston on the cam) the ECU does not need to know when the engine is at TDC of piston #1, it just needs to know when it is getting to TDC of any power stroke. It uses that to determine RPM and when to fire the coil. Where the rotor is pointed ...

hi,

i am just confused with the way my engine is set up from stock. its a mitsubishi 4g15 dohc 16valve. the stock ecu is 76 pin. the ignition system is distributor based, which is driven by the exhaust cam. I've verified the pinouts of the distributor and its a camshaft position sensor. there is no ...