Engine Leak Diagnosis On BMW Turbo V8 Engines

Use a borescope to identify if the source of the leak is from under the turbochargers.

By Underhood Service Staff Writers
Jun 17, 2020

Models: BMWs with the 4.4L turbocharged engine

When diagnosing an engine oil leak or a coolant leak on turbocharged V8 engines, it is necessary to use a borescope to identify if the source of the leak is from under the turbochargers. Using this method can avoid costly teardown labor charges to diagnose a leak. Also, this method can confirm if the turbocharger or oil pipes are leaking.

**Pay special attention to any ferruled or clamped hose connections (1).**

Insert the borescope to the inside (1) and outside (2) of the induction pipes. Rotate the borescope 360 degrees to search for any leaks. Try using the bore scope in the straight and 90° viewing positions.

**Insert the borescope downward towards the turbocharger oil return pipes. Look for leaking connections (1). Also search around the block surface for any standing engine oil or coolant (2).**

Do not remove the transmission before performing this inspection. Insert the borescope to the inside and outside of the induction pipes.

Diagnostic Procedures For Stop/Start Systems

Stop/start technology is more than just a switch wired to the brake pedal and starter.

By Andrew Markel
Jul 28, 2023

When trying to resolve a complaint, code or no-start/no-crank condition on a stop/start vehicle, it is essential to know how the system operates. The problem may not have a complicated reason – something simple may be causing the stop/start system not to work.

The greatest obstacle to the advancement of stop/start technology is the driver’s and technician’s lack of trust in and knowledge of the technology. Many older drivers and technicians fear that stopping and starting the engine will cause a shorter life for the battery, starter and engine. But the real fear is that the engine will not start again at a green light.