Why Hybrids Are More Susceptible to Carbon Buildup

  1. Shorter Engine Run Time
    Hybrid vehicles often switch between electric and petrol power, meaning the internal combustion engine (ICE) only runs intermittently. Since the engine doesn’t operate continuously, it may not reach the high temperatures needed to burn off carbon deposits, particularly during shorter trips.
  2. Low-Load Driving Conditions
    Hybrids perform well in low-speed, low-load situations like city traffic, where the electric motor does most of the work. When the ICE kicks in, it operates under minimal load, which reduces combustion efficiency and leads to carbon buildup on valves and in the combustion chamber.
  3. Start-Stop Functionality
    Many hybrids use start-stop systems that shut off the engine when idle and restart it as needed. While fuel-efficient, this frequent stopping and starting prevents the engine from maintaining high temperatures, making it more likely for carbon to accumulate over time.
  4. Direct Injection Technology
    Most modern hybrid engines use direct injection, which improves fuel economy but sprays fuel directly into the combustion chamber, bypassing the intake valves. Unlike port injection, where fuel cleans the intake valves, direct injection increases the risk of carbon deposits on intake valves.
  5. Reduced Exhaust Gas Temperatures
    Since hybrid engines run less frequently, their exhaust gas temperatures are lower compared to petrol-only engines. Hotter exhaust helps burn off carbon deposits, but hybrids rarely reach these temperatures, allowing carbon to build up, especially in the exhaust system and catalytic converter.


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