08 a3 glowplug fault is it related to high idle revs?

mobirl · 19-02-2013 11:10PM #1

Put a 1.9 tdi through vagcom diagnostics and it came back with a glow plug fault in cylinder 2 as the only engine issue, that wasn't while the engine was running in case that matters. I was wondering if it might explain while idling it will creep up to around 1000 revs from 800 or so then drop if you rev it before repeating

George Dalton · 19-02-2013 11:18PM

It won't be anything to do with the glow plug fault but I have seen loads of them idle a bit high when the fuel filter needs changing. So change that first and see if it helps.

mobirl · 19-02-2013 11:30PM

A faulty lambda sensor was also mentioned as a cause where the engine thinks its cold but isn't. Does that sound likely?

If its an oil filter would it just be down to luck of the draw or a sign of other issues elsewhere?

George Dalton · 19-02-2013 11:34PM

There is no lambda sensor on the 1.9TDI but a faulty coolant temperature sensor can also cause a high idle, will usually log a fault code though.

If the fuel filter cures the problem then it is probably just a sign that it needed changing, I wouldn't get too worried or start reading anything else into it.

08 a3 glowplug fault is it related to high idle revs?

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