Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Fuel Control
The Porsche 944 is equipped with the Bosch Air Flow Controlled (AFC) fuel injection system. The AFC system is electronically controlled by the ECU, which is programed to regulate fuel injection based upon information received from various data sensors. It also considers the specific data for the 944 engine (stored in computer memory).
The ECU generates control signals for the fuel pump relay, auxiliary air valve, cold start injector coil, and the cylinder port injector coils. These devices control cold idle, curb idle speed and mixture, air/fuel ratio and fuel supply.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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