Powertrain
generic / SAE
P050D
Cold Start Rough Idle
The ECU detects rough idle behaviour during the cold-start phase only. Once the engine has warmed up the issue disappears. Typically caused by injector deposits, low compression on one cylinder when cold, or sticky valve guides.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number5 / 0D
Possible causes
- Injector tip coked - poor cold spray pattern high
- Valve guide sticky when cold medium
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 80–600 €
- Estimated time: 0.5–3 h
- Component: fuel injectors
- Component: cylinder compression
- Component: valve guides
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012