Exhaust blowing noise
My exhaust is making an excessive noise – what is wrong with it?
If your exhaust is making an unusual amount of noise, then you have either fitted a loud sports exhaust, and that is how you want your exhaust to sound – or – more likely, your exhaust has a hole in it in the wrong place.
This is most likely caused by corrosion – the pipe or silencer box has rusted through, or a rubber mount has perished and the exhaust has cracked at one of the welded joints due to excessive movement during use. Exhaust gas, especially in petrol cars carries moisture, which can build-up in the exhaust system and over time, with high temperature fluctuations and condensation thrown in there, cause corrosion.
Once rust starts to spread on an exhaust it will quickly make the exhaust unsuitable and a potential MOT fail.
There is a lot of smoke coming out of my exhaust – what do I do?
Excessive smoke from your exhaust is never good, our advice is to stop the vehicle and park it in a safe place off the main road. Then call someone to recover the vehicle, if you are a member of a roadside assistance provider such as the AA, RAC or similar, then call them.
Lots of smoke is usually an engine issue, not an exhaust issue, but it will not be good for your exhaust either way, CATs and DPFs will be damaged by oil entering the exhaust from the engine and can quickly become blocked and need replacing if the problem is left to continue.
Engine issues are caused by a great many things failing including seals and ancillary equipment, however the most common cause of lots of smoke is the wrong fuel being put into the car petrol/diesel or vice versa. It’s easy done, so don’t be embarrassed, but don’t be tempted to drive to a garage or dive home, it will really damage your car and isn’t safe.