2. Valve Seal Failure: Worn or damaged valve seals can lead to oil leakage into the combustion chamber, causing white or blue smoke.
3. Piston Blowby: As the piston rings degrade or become damaged, they may fail to seal properly, causing high-pressure gases from the combustion chamber to leak into the crankcase. This blowby may result in smoke escaping through the tailpipe.
4. Head Gasket Leak: A failure in the head gasket can allow coolant to enter the combustion chamber. When this happens, your exhaust can turn into a thick white/blue smoke with a slightly sweet smell.
5. Injector Problems: If the fuel injectors are leaking, leaking fuel can escape into the exhaust system and appear as smoke from the tailpipe.
6. Turbocharger Failure: A failing turbocharger may cause engine oil or coolant to seep into the exhaust system, resulting in smoke.
7. Bad PCV Valve: A malfunctioning Positive Crankcase Ventilation (PCV) valve may lead to excessive pressure buildup in the crankcase, forcing oil and combustion gases into the exhaust system.
8. Exhaust System Blockage: A blocked or restricted exhaust system can cause fumes and smoke to be unable to flow properly, leading to smoke coming out of the tailpipe.
If you notice excessive smoke coming out of your Lexus' tailpipe, it is important to have the vehicle inspected and diagnosed by a trusted mechanic to determine the root cause and ensure that your vehicle is operating correctly.
