This is a worthwile find. So I am posting it.


PLMS SR20 Wiring Looms: "What parts do I need to run an SR20 with the factory EFI system?

Most importers know which parts need to be supplied with an engine package to get it going, but below is a checklist to keep 'em honest:

* EFI wiring loom (uncut!)
* ECU
* Airflow Meter
* Igniter


The following parts should still be mounted on the engine, but sometimes they go missing or get damaged, so it's worth checking when you buy your engine:

* O2 Sensor You should find this mounted in the section of exhaust just after the turbo. They are easily damaged so check that it's OK. There are two types - bigg'uns (18mm thread - usually found on the later 'black top' S13 SR's) and small'uns (12mm thread - usually found on earlier 'red top' S13 SR's).
* Speed Sensor. These are fitted in the gearbox where you'd normally expect to find the speedo cable. Normally treated as 'optional'. See more on this below under 'Speed Sensor Interface'.
* Crank Angle Sensor (Dizzy). Another one that is easily damaged. Check the connector on the loom that plugs into this one too. It is right at the front of the engine making these the most often damaged part.
* All factory engine sensors (TPS, 2x water temp sensors, detonation sensor). It's rare to have problems with these. The detonation sensor is nestled down under the inlet manifold mounted to the side of the engine block so it's well protected. Water temp sensors are a similar story. They are both mounted in the thermostat housing just next to the throttle body. One is for supplying a temp signal to the ECU (the 2 way one) and the other is for the temp gauge (single way).
* Coils and coils sub-loom
* Throttle Position Sensor (TPS). Strangely enough this is to be found on the throttle body! Responsible for really messing up an SR if it is dodgy or adjusted incorrectly. The one thing to watch out for here is that the auto and manual versions are different. See below."