It all depends on the ECU. Some can fire individual coil packs, and some do not.


Quote:Actually many EFI systems do not use a crank position sensor. It's only needed for spark but the Datsun ECUs do not control spark, but only the fuel injection. And cam sensor is used for Sequential injection, many systems are not sequential. Cam sensor also used for individual coil packs, but not required for dual-coil packs. Starting around 1984 Nissan added spark control to the ECUs. Before that it used a tach signal for engine RPM.

But isn't Sequential EFI so much better than non-sequential? Not really. HP levels are about the same. Fuel economy might be a little better. Emissions are a little better which is why some OEM setups use it. There is nothing wrong with SEFI, it works fine.