How do you adjust the idle speed on a Toyota Corolla Verso
From about 1992 models, subject to geographic variations, the idle speed is preset by the engine management system and is not adjustable, though it might be possible with dedicated diagnostic equipment.
If the idle speed is not to specification and of the none-adjustable type there could be a fault or faults or adjustments could be required elsewhere; valve clearances for instance.
You can adjust the idle air right at the air intake
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