How to Check for Carbon Buildup in a Car?
2 Answers
Methods to check for carbon buildup in a car include: First, disassemble the engine to inspect for carbon deposits; second, remove the spark plugs or fuel injectors and use an endoscope to observe the extent of carbon buildup on the valves; third, ensure the car is stationary for more than 5 minutes, then open the engine oil filler port to observe the engine crankshaft through it, as carbon deposits will adhere to the crankshaft; fourth, remove the intake hose of the throttle body to get a clear view. More detailed information is as follows: 1. Carbon buildup is a coking-like substance formed from unsaturated olefins and gums in fuel under high temperatures during engine operation. 2. If carbon buildup has already caused issues such as idle shaking, difficulty starting, high idle speed, or excessive exhaust emissions, it must be cleaned. Cleaning can be done using some no-disassembly cleaning agents.
Does the car have carbon deposits? Here are a few things to pay attention to when driving. If the engine idles roughly, shaking like a massage chair, or if the acceleration feels sluggish when stepping on the gas, making the car seem lazy, it might be due to excessive carbon buildup. Carbon deposits are the black residue left from incomplete fuel combustion, clogging internal engine components. For a simple check, you can remove the spark plugs—new ones are light brown, and if they're black, it indicates high carbon buildup. But be careful when handling them to avoid damaging the wires. A sudden increase in fuel consumption is also a clear sign—if you're burning an extra liter or two compared to usual, something’s wrong. I sometimes use fuel additives for cleaning, and they work decently. In severe cases, the exhaust smells bad, and the car may stall at low speeds. Prevention methods include avoiding short trips and occasionally driving on the highway to clear out carbon deposits. In short, keep an eye on your car’s performance, and if you notice anything unusual, take it to the repair shop early to avoid costly engine repairs later.
