BMW’s have a brand-specific VANOS system, which is a variable valve timing system that allows for electronic and automatic adjustments. As an ode to manual timing done by hand historically, the VANOS system of BMW models controls the intake position and exhaust camshafts via oil pressure.

A gear on the VANOS actuator and camshaft is used to get this task done. BMW actually offers three different VANOS setup options that consist of a single VANOS, dual VANOS, or dual VANOS with Valvetronic. All of these systems, however, are subject to repair and maintenance requirements.

How are these systems different?

To discern what the potential issue could be with the VANOS System of your BMW, a mechanic will need to know which one your specific BMW relies on. The single VANOS system consists of variable camshaft timing that does not adjust the exhaust camshaft. The dual VANOS system, however, controls the exhaust on both the intake and exhaust camshafts to improve emissions and maintain a quicker warm-up time. The dual VANOS system with Valvetronic adjusts the valve timing and lift valves, which generates increased horsepower, better driveability, and improved fuel economy.

Common Problems with the VANOS System

Every VANOS system offered in BMW models is susceptible to similar problems. Yet, there are more complex issues within specific model types. Here are a few things you should look out for in the following VANOS System setup options:

Single VANOS

• Decline or loss in driveability
• Reduced horsepower
• Decreased torque
• Rough idling
• An intermittent rattling noise
• Reduced fuel economy

Dual VANOS

• Lower range power
• Loss in torque
• Slow reaction time
• Hesitation in acceleration
• Hiccups during idle
• Consistent rough idling
• Slow to cold start

Dual VANOS with Valvetronic

• Poor and rough idle tendencies
• Reduction or loss of low-range power
• Cold start hesitation and odd noises
• Engine stall during idling
• Acceleration hesitation

Diagnosing a Faulty VANOS System

There isn’t much you can do to detect a malfunctioning VANOS System in your BMW, other than taking it to a service repair shop where diagnostic tests can be performed. This complex electrical system will throw certain codes, depending on the type of VANOS system being used and the type of issue it is experiencing. Intake solenoid, exhaust solenoid, actuator, and camshaft codes are some of the most common to appear.

Letting the professionals lead the way and take the reins in your BMW’s VANOS system repair is crucial. An improper repair could damage your entire engine, so it’s best to leave this one to the professionals.

There are a few things you can do to reduce the likelihood or frequency at which your BMW’s VANOS system may need repair. Be sure to replace the seals of your VANOS system every 50,000 miles or replace or refurbish the unit every 70,000 miles.

Seek Out Repair for Your BMW’s VANOS System at Rowlett Motorwerks

Any electrical component malfunction or engine issue that occurs with your BMW should be left to the professionals, as one wrong move could cause extensive and irreparable damage. Finding a place to do this kind of work dependably is even more difficult. If you are in the areas of Garland, Rockwall, Sachse, Wylie, or Rowlett, Texas, however, you are in luck. Rowlett Motorwerks specializes in this kind of care for BMW models as well as other premium European and domestic vehicles.

At our repair shop, we help every customer set up preventive care services to prevent the occurrence of larger issues. That’s why we offer an oil change special for $99.95 with 5 quarts of synthetic Liqui Moly oil, an oil filter, and labor. Although these services don’t contribute to your BMW’s VANOS system, they do prove our commitment to the maintenance of customer vehicles.

In addition to servicing the VANOS system of BMW, we also provide clutch services, engine repair, and preventive maintenance. As a full-service repair shop, we can address and tackle any issue your BMW may have. When you need assistance diagnosing or correcting issues with your vehicle, give Rowlett Motorwerks a call at (469) 910-8087. Let our professionally trained technicians get your BMW into the best shape ever.

* BMW Engine image credit goes to: teddyleung.