“Why Does My Fuel Economy Suddenly — Could Old Spark Plugs Be Killing Efficiency?”

Home > Gari Forums > Chery Forums > Chery Tiggo 8 Pro Forums > Chery Tiggo 8 Pro Spark Plug Problems Forums

“Why Does My Fuel Economy Suddenly — Could Old Spark Plugs Be Killing Efficiency?”

After a few months, some owners observe that their Tiggo 8 Pro is giving lower mileage even without change in driving habits. Could degraded spark plugs with worn electrodes o r carbon buildup reduce combustion efficiency and force the engine to burn more fuel? Would changing spark plugs restore decent fuel economy?

Talha Kyanii asked on 06 Dec 2025 10:02:46 am

1 Answer

6 views |

Gari Master - on 06 Dec 2025 10:04:16 am

Old o r fouled spark plugs reduce fuel efficiency:

Incomplete combustion forces the engine to inject more fuel to maintain power.

Carbon buildup o r electrode wear increases fuel consumption and emissions.

Solution:

Replace spark plugs with the correct type.

Clean o r replace ignition coils if necessary.

Using good-quality fuel helps reduce deposits on spark plugs.