Chery Tiggo 7 Pro carbon buildup on intake valves
Rough idle, hesitation on acceleration, and reduced fuel economy developing gradually over 50,000-80,000 km. The SQRE4T16D is a direct injection engine and does not wash the intake valves with fuel. Carbon deposits build up on the back of the intake valves over time. Walnut blasting or chemical intake cleaning by a specialist every 60,000 km prevents severe buildup.
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