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Pulsing acceleration only when engine labours


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Hi all,

I have 2006 A4 Avant 1.9TDI 102,000 miles, FASH

Just started to notice that when sat in 4th at say 35mph or 60mph in 5th and I go to accelerate (without changing gear), instead of labouring slightly and slowly building up speed in an even manner, the engine pulses at about 1 second intervals and this can be heared in the engine tone.

The pulsing cannot be seen on the rev counter or speedo.

Under normal gear changes there isn't an issue and under hard acceleration everything is fine. It's just when I'm being lazy and can't be bothered to change down to accelerate. I know the engine will labour but it isn't a slow, smooth build up anymore.

Any ideas.


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