- Really rich running on both petrol and LPG.
- I have unplugged all the HT leads, and plugged a spark plug in to look at the spark while turning over. It gives a fairly strong blue (white when plugs are cleaned of rich soot) spark pulse that is regular, but in between the main pulses are a lot of weaker blue crackly ones. This is one of the most puzzling aspects.
- The changes below have improved the spark from what it was, but it's still not good.
- ECU (A scrap unit from Japan).
- Igniter (Tried 4 different scrap units, one very new looking).
- Coil (On the 4th one now, I think a stuffed condenser was wiping these out. Current coil is aftermarket).
- Condenser (New from Toyota).
- Distributor cap (Aftermarket).
- Rotor arm (Aftermarket).
- Ne and G pickup coils (Sourced from a scrap distributor from Thailand. I know Toyota manual says if gap on these is not factory set, to replace distributor. I don't have that kinda £££! So I've set the gap myself using a feeler gauge. They give a reasonable AC voltage when spinning the distributor on a bike wheel!)
- HT leads.
- Spark plugs.
- Timing with a strobe.
- Checked the following signals using an oscilliscope:
- From Ne and G sensors to the ECU.
- IGt and IGf between ECU and Igniter.
- Checking these signals was difficult as there was a lot of noise, and I had no real reference of precise values to be looking for.
- Checked earthing, and ran extra earth strap from battery to star point in engine bay, and to igniter.
- 1993 Toyota Townace, grey import.
- 3Y-EU engine. Only other car this was installed in is the Hilux Surf.
- LPG kit. Problems are present on both gas and petrol running.
- Model: E-YR21G-MEZE
- Frame: YR21-0129220
Thanks in advance!