Converting to Motronic 1.3
Motronic 1.3 was introduced to E30s 1988 when the facelift cars were launched, and was the final version of the engine management system used on these cars. For those with older vehicles, it can be worthwhile stripping out your older system to fit Motronic 1.3. Here's why and how it's done.
Contents
Benefits
The main thing anyone is going to want to know is why upgrade to M1.3 from the earlier systems. If your car is running fine as it is and you are happy with keeping it original, both in terms of performance and function then there probably isn't that much point in going to the effort. However if you are looking to increase performance or you are having running issues then it might be a good option, some may say necessity on the performance side of things.
• Firstly going to the single crank pulley sensor is both easier to fault find with as there are less parts to go wrong and there is no TDC tab that have been known fall out of the flywheel. Is easier to access to replace.
• Capability for a lambda to be fitted.
• Improved accuracy of sensors and event timings for better engine running (fuelling and timing).
• Ability to remap chips for increased performance.
• Able to run a MAF instead of an AFM, again for increased performance.
Components
Sensors
Like all Motronic systems, 1.3 runs on a number of sensors, these are:
| Sensor | Location |
|---|---|
| Air Flow Meter | Engine Bay |
| Intake Air Temperature sensor | Built into the Air Flow Meter |
| Crank Position Sensor | Front of engine block |
| Throttle Position Switch | Under throttle body |
| Engine Temperature Sensor | Engine head |
| Cylinder Identification Sensor | Fitted to HT leads |
| Lambda Sensor - catalyzer-equipped vehicles only | Exhaust downpipe |
