Power loss of internal combustion engines – Problems & How to Repair

Over time, internal combustion engines may lose their performance due to a variety of reasons. Mainly because of the aging of the engine, the burning process no longer runs too frictionless and ‘smoothly’ as at the beginning. For this purpose, the air and fuel supply, as well as the compression and ignition play an important role.

Air Supply

The wear of the air filters can cause the engine to work harder to absorb air. Fortunately, this problem can be easily solved with a simple filter change.

The throttle cable may lose its tension over time, resulting in an inefficient performance. The loose cable must therefore be tightened again, or replaced if necessary.

Traps and blockages in the silencer can block the exhaust emissions, and thus the general circulation of the engine.

Fuel Supply

As far as the fuel supply is concerned, the injectors play an important role. Wear can lead to misfires or unfavorable fuel-gas mixture.

An insufficient fuel supply can also occur due to an age-related inefficient gasoline pump, which is noticeable during particularly strong demand for power in the high speed range.


The cylinder head gaskets lose their efficiency due to the friction on the combustion chamber over time. This results in an increased escape from the combustion chamber, which eventually leads to a weaker compression of the fuel mixture. Important for a longevity of the cylinder head gaskets is an adequate oil supply.

Inefficient compression may also occur due to the intake valves if they do not close as scheduled in the timing process.


In addition to a reduced engine performance, the cause for misfiring, start problems or juddering when driving are usually defective spark plugs. Broken spark plugs are recognized by the fact that they have either a crack in the ceramic insulation or impurities on the contacts.