1.4 match - VW Polo 2008

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Sun 12 May 2013 12:58
1.4 match - VW Polo 2008 - andyboy744

My polo was very lumpy during idle, it was due a service and when the plugs were changed No 4 was sooty. The mechanic plugged his computer in and no fault codes came up and suggested changing the coil pack, this made no difference and he also did a compression test and all was ok. Has anybody any ideas as to where to look next.

Thanks.

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Sun 12 May 2013 18:39
1.4 match - VW Polo 2008 - Railroad.

If you use cheap supermarket fuel stop doing so and use branded stuff. Better still use super high octane unleaded.

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Sun 12 May 2013 19:41
1.4 match - VW Polo 2008 - andyboy744

Why only on one plug though ?

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Sun 12 May 2013 20:09
1.4 match - VW Polo 2008 - unthrottled

Better still use super high octane unleaded.

Because lack of octane is really going to be causing an idle problem! Honestly! Octane rating is not synonymous with quality. Nothing wrong with the fuel.

If you've looked at spark and not found any answers, then try fuelling. Switch the injectors round and see if the problem moves to a different cylinder. If it does it;s likely to be an injector fault.

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Sat 25 May 2013 11:37
1.4 match - VW Polo 2008 - andyboy744

just to close the loop, it turned out to be a fuel injector.

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Sat 25 May 2013 13:55
1.4 match - VW Polo 2008 - Collos25

If you use cheap supermarket fuel stop doing so and use branded stuff. Better still use super high octane unleaded.

What a load of rubbish,

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Sat 25 May 2013 14:03
1.4 match - VW Polo 2008 - jc2

+1. Notice how BP & Shell may have fixed prices.

Edited by jc2 on 25/05/2013 at 14:05

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