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If you mean hunting at idle, the problem is caused by the idle speed being set too high or the idle switch is not properly adjusted.

When the throttle is closed as indicated by the idle switch the fuel is cut off by the fuel cut solenoid until the engine speed drops below a preset speed. If the engine speed is higher than that speed and the idle switch is closed there is no fuel for the engine, thus the engine speed drops. When it drops below the preset speed the fuel is turned on and the engine speed goes back up.

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12y ago
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Q: What causes hunting on an x reg focus 1.8 petrol engine?
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