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.
Knock Control
Ignition knock on 944-S and 944 Turbo models is sensed by knock sensor. Sensor is mounted on crankcase, between cylinders No. 2 and 3. Ignition for the affected cylinder is retarded 3 degrees. If knocking occurs again, the ignition of the cylinder will be retarded again by 3 degrees, up to a total of 9 degrees. If this stops the engine knocking, the ignition will be advanced to the correct value in steps.
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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