⚠️ Black smoke and poor MPG? Carbon buildup is just one cause, but boost or injector leaks amongst other issues can also cause it.
Here we have a Mercedes E320 CDI (2008 – 128,696 miles) booked in for diagnostic consultation and Engine Carbon Clean after the owner had noticed declining MPG and the exhaust tips getting blacker recently.
Initial inspection of the engine bay found a tell-tale ‘chuff-chuff' noise from the left hand side and although not immediately visible when shining a light above the injectors we could see a leak.
No clean on this one. With any kind of boost or injector leak it…
– wouldn't clean properly
– wouldn't be safe
– wouldn't resolve the customer issue
– would just get dirty again really quickly.
Clean abandoned, but we completed the diagnostic work and can return at a later date.
Initial diagnostics found an issue with the left door mirror heater.
Live data conformed an over fuel on the injector, but all other data looked good with coolant temperatures staying between 85-93°C when tested.
The owner can now get this resolved and call us back to finish off the booking at a later date.
☑️ Full live data Diagnostics
☑️ Which? Trusted Traders approved Engine Carbon Clean
☑️ Safety first, fully insured and IMI Certified
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