BMW Upper cylinder clean

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BMW Upper cylinder clean

Why Does My BMW Need an Upper Cylinder Clean?

There are a few ways an upper cylinder clean can be carried out on a BMW: 

  • Spray the cleaner into the throttle body where it gets sucked into the intake manifold
  • Pump the cleaning agent into a vacuum hose or pipe that enters into the BMW’s intake manifold 
  • Remove the spark plugs and spray the cleaner into the spark plug holes

All methods can be done separately or performed together within the same upper cylinder cleaning task. There are various cylinder cleaners available and your mechanic will determine the best cleaner and method for your BMW.

Carbon build-up on BMW cylinders can cause pre-ignition, due to the heat of the carbon deposits, it leads to an engine misfire. When BMW engines are firing at the wrong time it’s not healthy and can cause the following problems.

The BMW will eventually respond poorly, idle roughly, noticeable engine knocking and loss of power on acceleration. Fuel consumption could increase and the BMW’s engine light may come on. Some of these signs can be subtle and easily go unnoticed, that’s why it’s a good idea to add an upper cylinder clean to your BMW’s service on a regular basis.

An upper cylinder clean will generally cost in the tens of dollars up to the hundreds, it depends on how dirty it is, the time taken to clean and the type of BMW. An upper cylinder clean is a quicker and cheaper alternative to pulling an engine apart to be cleaned. In some cases, a can of spray might not fix the problem and the BMW’s engine might need to be pulled apart, which can cost into the thousands.

BMW Models

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