Engine Sound Diagnosis
Each turbocharged engine system has its own distinctive sound or noise level when operating. In many cases, malfunctions can be detected when this noise level changes. If the noise level changes to a higher pitch it can indicate an air leak between air cleaner and engine or an exhaust gas leak in the exhaust system between turbocharger and engine. Noise level cycling from one level to another can indicate a plugged air cleaner, restricted turbocharger air inlet or heavy dirt build up in the compressor housing and on the compressor wheel.