Fuel-injected engines can get carbon buildup

By Doug McAllister

While today's direct fuel-injected engines generate incredible power from very small power plants, it doesn't come without some problems. Because the fuel is injected directly into the combustion chamber, there is no fuel washing over the valves to keep them clean.

Using quality fuel and performing regular fuel-injection services are becoming more and more important. Over time we are starting to see all kinds of carbon buildup on the backsides of the valves and the valve stems.

In the most severe of circumstances, one or more of the valves may not close all the way. This causes misfiring and the Check Engine Light to signal a warning. In those cases, the engine may have to be torn down to be cleaned and repaired.

Regular fuel-system cleaning can prevent the carbon buildup from getting so severe that it causes problems.

It is also very important to use a Top Tier fuel, which also can help minimize buildup. This gasoline exceeds EPA minimum detergent requirements.

Find out more about the Top Tier designation and retail stations that sell this gasoline at toptiergas.com.

• Douglas Automotive is at 417 W. Main St., Barrington; 123 Virginia Road, Crystal Lake; and 416 Northwest Hwy., Fox River Grove. For information, visit douglasautomotive.com. Send questions to underthehood@dailyherald.com.