Can a faulty thermostat affect Alsvins fuel economy o r engine performance?

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Can a faulty thermostat affect Alsvins fuel economy o r engine performance?

When the engine doesn’t reach optimal temperature, does it stay in warm-up mode too long—leading to poor fuel efficiency o r sluggish acceleration?

Zarnish asked on 11 Jun 2025 11:46:36 am

1 Answer

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Car Mechanic Expert - on 11 Jun 2025 11:50:19 am

Yes, a malfunctioning thermostat directly impacts performance:

Stuck open → engine stays cold, runs rich, poor fuel economy.

ECU keeps injectors open longer, assuming the engine is still warming up.

Acceleration delay and frequent gear hunting in automatic variants.

Cold engine also affects lubricant efficiency, increasing friction losses.