article thumbnail

BMW Transfer Case Service

Tomorrow's Technician

A customer who had a 2007 BMW X3 was having an erratic problem with the check engine light coming on and an issue with the transfer case 4W operation. engine and 6L45 transmission with 65,000 miles on it. The AWD vehicle had a 3.0L The Bimmer was driven with a scanner to see what was up.

article thumbnail

Timing Chain Systems Need Clean, Quality Oil

Tomorrow's Technician

The two most at-risk components are the hydraulic tensioners and VVT cam phasers – both highly dependent on the oil supply. The engine is designed with three hydraulic tensioners as well as four VVT cam phaser and solenoid units, all of which are highly dependent on oil.

Insiders

Sign Up for our Newsletter

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

article thumbnail

VW Four Motion

Tomorrow's Technician

With an automatic transmission, the engine has to drive a pump and energy is lost in the torque converter and clutch packs. LUBRICATING HYDRAULIC FLUID Instead of a linkage connected to a shifter, the shift forks are actuated by hydraulic solenoids. The fluid also acts as a hydraulic fluid.

article thumbnail

BMW Transfer Case Service

Brake & Front End

A customer who had a 2007 BMW X3 was having an erratic problem with the check engine light coming on and an issue with the transfer case 4W operation. engine and 6L45 transmission with 65,000 miles on it. The AWD vehicle had a 3.0L The Bimmer was driven with a scanner to see what was up.

article thumbnail

Mercedes-Benz Engine Oil Leaks

Tomorrow's Technician

If one of these hoses begins to leak ( Figure 2 ), the customer may notice a rough idle, hard start or an illuminated check engine light. For example, a number of suspension bushings may be filled with a hydraulic fluid. The rubber hoses that carry the crankcase gases can degrade over time, becoming hard or even brittle.

article thumbnail

Brake Pedal Position Sensors 

Tomorrow's Technician

Data from the ABS hydraulic control unit’s (HCU) pressure sensors is also used to decipher what the driver is doing. With the stop light switch ON, the brake pedal load sensing switch OFF, and the master cylinder pressure 870 psi or more, the vehicle speed is 0 mph for 5 seconds or more. Another common code is C0277.

article thumbnail

Brake Pedal Position Sensors 

Brake & Front End

Data from the ABS hydraulic control unit’s (HCU) pressure sensors is also used to decipher what the driver is doing. With the stop light switch ON, the brake pedal load sensing switch OFF, and the master cylinder pressure 870 psi or more, the vehicle speed is 0 mph for 5 seconds or more. Another common code is C0277.