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I know it's been discussed many times before but I've tried just about everything to stop my engine surging but without success.
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I'm the proud owner of a MK1B which I've had for about four years, three of which have been spent in the garage.
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I'm in the process of getting it back on the road but it's developed an annoying issue where it won't stop surging on idle.
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The symptoms:
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It starts fine and for about a minute or so, the idle speed is steady at the fast idle speed as the engine warms up.
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Then the surging starts.
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Eventually the fast idle will cut out and the revs will drop as you would expect, but even though the revs have dropped, it still surges.
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What have I tried?:
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I've bled the coolant and I know there is no air in there.
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I've also changed the coolant temperature sensor and cold start sensor.
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I've changed the MAP sensor.
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I've checked for vacuum leaks and I'm pretty confident that there are none.
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I've checked the TPS which is working fine.
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I'm running out of ideas!!!
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Thank you in advance,
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James