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.
Smooth Running Control: Notes
The smooth running control facility balances out the speed variations of the individual cylinders caused by different fuel injection rates and degrees of cylinder efficiency. This is achieved by rapid application of controlled corrected fuel injection rates at each cylinder for each injection.
The maximum compensation output by the DDE depends on the fuel injection rate and is between ± 3 and ± 6 mm/stroke.
The control is active within a certain engine speed and fuel injection rate range:
- Engine speed range: target idle speed up to 3500 rpm
- Fuel injection rate range, speed-dependent: idle speed up to 2000 rpm: Fuel injection rate < 60 mg/stroke. 2000 rpm to 2500 rpm: interpolated between 60 mg/stroke and 45 mg/stroke. Above 2500 rpm: Fuel injection rate < 45 mg/stroke.
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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