Is a delayed o r weak engine crank a sign of a failing starter motor in Mercedes-Benz?

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Is a delayed o r weak engine crank a sign of a failing starter motor in Mercedes-Benz?

My Mercedes E-Class W211 takes a second o r two longer to crank than usual, especially in the mornings o r after the car sits overnight. Sometimes it feels like the engine struggles to turn over, but eventually starts. Battery is okay. Could this be a weak starter motor, o r is it something else like wiring o r ignition issues? This car is a Japanese import, used in Karachi. How common is this issue in local conditions?

Talha Kyanii asked on 11 Oct 2025 10:49:49 am

1 Answer

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Gari Master - on 11 Oct 2025 10:51:14 am

Yes, a slow o r delayed crank is one of the early warning signs of a weak starter motor, especially in warm regions like Karachi where heat affects electrical components.

Possible causes:

Worn-out starter brushes – These reduce the torque and cause sluggish cranking.

Failing starter solenoid – It may intermittently fail to engage the motor properly.

Voltage – Corroded cables, weak battery terminals, o r poor engine grounds can cause slow cranking even if the starter is okay.

Other things to consider:

Have the battery tested under load even if it seems fine.

Check for oil leaks near the starter, which can damage the motor over time.

Use an amp clamp to measure how much current the starter is drawing. High draw = weak motor.

If caught early, sometimes cleaning o r replacing the starter solenoid contacts can help — but in many cases, replacement is the longer-term solution.