Slow cranking or just a click, worse when the engine is warm
- Make and model
- Skoda Fabia II
- Year
- 2009
- Engine
- 1.4 16V
- Fuel
- Petrol
- Mileage
- 160,000 km
Customer complaint
Sometimes the starter only clicks or cranks very slowly, more often when the engine is warm. The battery tests good and jump-starting does not always help.
Hot startIntermittent
Fault codes
No fault codes stored.
Measurements and live data
| Parameter / measurement | Measured | Expected |
|---|---|---|
| Battery voltage while cranking | 10.4 V | above about 9.6 V |
| Voltage drop, battery negative to engine block, cranking | 1.1 V | below about 0.2 V |
| Voltage drop, battery positive to starter terminal, cranking | 0.25 V | below about 0.5 V |
Tests performed
- Voltage drop on both sides of the starter circuit while crankingExcessive drop on the ground side only
- Engine ground strap inspectedCorroded inside the insulation at the gearbox end
Solution
Root cause
Corroded engine ground strap with high resistance, worse when hot.
Repair
Replaced the engine-to-body ground strap and cleaned the contact points. Ground-side voltage drop now 0.08 V; cranking normal hot and cold.
Parts
Engine ground strap
Labour time
0.5 h
Lesson learned
A good battery and a good starter can still crank slowly: a voltage drop test finds the bad cable in minutes.
Training case: the usual fix for this fault, not a confirmed repair on a specific car.
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