Rough idle on Polo 1.4 Match 6N2 2001

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Kal_El
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Posts: 9
Joined: Thu Aug 26, 2021 2:25 am
Drives: Match 1.4 2001
Location: Derby

Rough idle on Polo 1.4 Match 6N2 2001

Post by Kal_El »

Hi

My car was stood for a while and needed some work. Had it all done and booked for MOT on Tuesday but concerned it may fail emissions due to rough idle. Changed the coil pack, had a full service with new spark plugs. Exhaust is fine. Had some leaks but all welded up nicely now. It sits at about 800rpm on idle but sounds more like a diesel than petrol lol. Not an extremely rough idle but was much quieter before. Any ideas what it could be?
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JUUL
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Joined: Sat Jul 31, 2021 8:55 am
Drives: 6N 1995
Location: Netherlands

Re: Rough idle on Polo 1.4 Match 6N2 2001

Post by JUUL »

Most common rough idle problem for these vehicles is a clogged crankcase breather hose, PCV valve and/or EGR. The breather hose is on the left side of the air filter and goes down to the PCV (positive crankcase ventilation) valve on the back of the engine. The EGR is located on the right front side of the engine and goes through a pipe/hose towards the back of the engine. If one (or both) of these is clogged with muck or sludge it makes the engine run like crap. If you want more detailed information search on youtube for 1.4 'crankcase breather', 'PCV valve' and 'EGR'. Good luck!
Kal_El
New
Posts: 9
Joined: Thu Aug 26, 2021 2:25 am
Drives: Match 1.4 2001
Location: Derby

Re: Rough idle on Polo 1.4 Match 6N2 2001

Post by Kal_El »

Thanks for the advice. I’ll give it a try. Much appreciated.
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