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.
Temperature compensation
At a certain engine load (mg air/combustion), a certain air mass is drawn into the cylinder during the induction stroke. If the engine coolant temperature or intake air temperature is low, the air will have a higher density than normal. This means that the pressure in the combustion chamber will be lower when combustion starts. At lower gas pressures, the combustion velocity is lower, which means that the ignition must be advanced.
There are two tables in the control module memory in which the number of degrees the ignition is advanced is specified depending on the coolant temperature or intake air temperature.
Use the Manual With the Right Hardware
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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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