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.
Intake Values, Opening Angle (Ca)
The parameter corresponds to the "Camshaft shift angle" but is calculated from another reference position on the crankshaft.
The engine control module (ECM) calculates the value using signals from the impulse sensor (crankshaft position) and the camshaft sensor (camshaft position).
The value indicates when the intake valves open relative to top dead center (TDC) of the cylinders.
The value reduces the farther out the camshaft is guided.
When the camshaft is in its 0 position (camshaft not guided out), the angle is 27°CA; when it has been guided out fully the angle is -23°CA.
CA = Crank Angle.
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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.