What action does tampering typically involve regarding engine performance?

Tampering primarily involves adjusting fuel or exhaust settings to manipulate engine performance. This can mean altering the air-fuel mixture, changing exhaust configurations, or modifying engine control parameters. Such adjustments are often done to enhance performance, increase power output, or alter emissions profiles beyond what is manufacturer-approved.

These modifications can lead to compliance issues with regulations, as they may violate emissions standards or safety guidelines. Therefore, the emphasis on controlling fuel and exhaust settings plays a significant role in ensuring that engines perform within the designed specifications for efficiency and emissions.

In contrast, upgrading to a more modern engine typically involves replacing an entire system and is less associated with tampering. Cleaning fuel injectors is a maintenance activity aimed at restoring performance. Installing aftermarket accessories can enhance engine performance but does not specifically target fuel or exhaust settings related directly to tampering.