On a 1999 Terrano 2.7tdi automatic the tickover is erratic sometimes and at other times displays a "hysteresis" pattern (thrum thrum thrum like an old commercial diesel). however normal running is OK and fuel economy as normal. Car is regularly serviced so filters should not be clogged. Have tried Redex diesel in a tank of fuel without much success.
Any ideas?
Not too worried because I'm trading it in soon and the problem is probably not bad enough for dealer to notice.
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