Recently, a customer brought their Mercedes-Benz E63 AMG (6.2L, 2011 model year) to our workshop, Savtrans, in Berlin. The problem: heavy smoke from the exhaust. Another Berlin workshop had already recommended an engine overhaul – luckily, the customer came to us beforehand.
Diagnosis in our car workshop Berlin
- Scanner connected
- Error detected
- All errors read out
- Visual inspection carried out
Our team immediately connected the diagnostic scanner and read out all the error codes. In parallel, we carried out a thorough visual inspection. The result was initially astonishing: the piston system was fine, no oil leaks, no damaged cylinder head gasket – and yet massive smoke was coming from the exhaust.
What the smell revealed
Our vehicle electrician, Stas, noticed that the exhaust fumes had an unusually chemical smell – not a typical smell of oil, nor of coolant. This indicated that a foreign substance must have entered the exhaust system or the engine.
The unexpected cause – foam in the exhaust system
As Master Stas revved the engine to higher RPMs, liquid began to leak from the exhaust, accompanied by an intense chemical smell. The vehicle was raised at the front, whereupon the liquid completely drained from the exhaust system.
A call to the customer brought clarity: During the last car wash, he the entire exhaust system sprayed with cleaning foam. As long as the engine was running at high revolutions, the liquid remained in the system, creating the thick smoke.
The solution – without engine overhaul
The vehicle was operated in an inclined position for 30 minutes. During this time all the fluid drained out. Afterwards: no smoke, no smell, the engine runs normally. No spare parts, no engine overhaul – just a thorough diagnosis.
Why cleaning products are dangerous in the exhaust system
Many drivers underestimate the risks if foam or cleaning agents enter the exhaust system. Possible consequences include:
- Lambda sensor damaged – Cleaning agent residue interferes with the measurement of the air-fuel mixture
- Catalyst destroyed Chemical substances can attack the coating of the catalytic converter
- Corrosion in the exhaust pipe – Moisture and chemicals accelerate rusting
- Malfunctions in engine management – faulty sensor data leads to unnecessary error messages
Frequently Asked Questions (FAQ)
What does smoke from the exhaust mean on a Mercedes?
Smoke from the exhaust can have many causes: condensation (harmless when starting cold), oil in the combustion chamber (bluish smoke), coolant (white, sweet-smelling smoke) or – as in this case – foreign substances in the exhaust system. A professional diagnosis quickly and reliably clarifies the cause.
Must the engine always be overhauled for heavy exhaust smoke?
No. This case shows that heavy smoke does not automatically mean engine damage. Without a thorough diagnosis, expensive repairs may be recommended that are not actually necessary. Come to us first – our diagnosis costs from 30 Euros.
What to do if cleaning fluid has got into the exhaust pipe?
Do not drive any further. Have the vehicle checked by a specialist workshop. It is often sufficient to allow the fluid to drain in a controlled manner – if action is taken in good time, no permanent damage will occur.
Professional Car Diagnostics in Berlin – Savtrans Workshop
Should you notice similar symptoms – heavy smoke, a chemical smell, or unusual engine noises – come to us before you have expensive parts replaced.
Our car workshop Savtrans in Berlin Lichtenberg is open Monday to Friday from 9:00 AM to 7:00 PM and on Saturdays from 9:00 AM to 2:00 PM.
📞 +49 176 76766771 | 📍 Gärtnerstraße 17-18, 13055 Berlin
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