What does it take to make Bosch Fuel Injection Standalone? A walkthrough of the Opel Motronic System

  • August 14, 2019 at 8:30 AM
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Walkaround of the Bosch Motronic Fuel Injection on a Opel CIH motor on my Break-in engine stand.

What I meant by funny connector on the Motronic ignition coil, is that it has TWO Bosch two pin connectors. It doesn't matter which one you connect too. So basically one for computer and one for your tach. Instead of spades and or stud w/ nut. The Motronic coil is a very low ohm coil ( about .5 ohms) like a performance coil. You can use that instead if you are custom wiring.

Another thing I didn't mention, the wiring the Old Opel relay, can be easily replaced with standard Bosch 4 prong relay. Its mainly to give power to the computer and the fuel pump. If you wire the fuel pump separately ( which I recommend anyway to protect the 30 year old computer ). Have the power to the coil and the ECU wired through a "Ignition on" relay. Then wire the fuel pump and the O2 sensor via their own relay(s). A good safety feature would be to use a trigger switch like from a 90s Ford to turn off the fuel pump circuit in a crash.

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