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As title says my golf has been running a little rough ever since I've owned it not exactly a problem but I'd rather it run smooth. Any help is appreciated.
I am not a mechanic, but having owned a Mk3 for 20 years, a couple of things to try:
- what fuel are you using? VWs drink premium unleaded (use the 95 RON as a minimum 98 RON is better if you can afford it, go with the reputable service stations, I find I get much better fuel economy from the Caltex Vortex premium 95 RON than the Shell stuff or the United stuff)
- check the spark plugs and spark plug leads (if you are not getting a good spark in one or more cylinders then it will idle rough)
- check you do not have a leak from the exhaust gas return pipe (On top of the silver rocker cover of the engine, there is a square black box on the left hand side, there is a two-pronged rubber pipe that leads in and out of it, check that rubber for cracks, unfortunately Mk3 have a lot of plastic/rubber pipework around engine and if you have a crack it will bleed air which may cause it to idle roughly)
I understand that E10 has a RON of 94. All the Government advertising say that vehicles of Mk3 age can use E10 but that you should check with your manufacturer. However, I have never found anything official from VW which says the Mk3 can use E10. I believe that E10 will give you worse fuel economy too. 98 RON did not seem to make any significant difference to performance or fuel economy over 95 RON for me. I have run a tank of regular unleaded in my Mk3 in an emergency situation but it is definitely rough.
Just an update on my idle, I replaced my timing belt and it improved the idle a little bit but it's not perfect, when it's cold it sits at 1k dead till its warm and then goes back to bumping around 850-900. Going to try 95 fuel as my tank is near empty now.
The 1k idle when cold and settling down to about 800 is normal, designed to help get the engine temperate up to normal range quickly during cold weather. When it is warm weather or when the engine is still warm you will find that it will idle at 800 rpm at start.
After a few days running 95, still idling ruff, odb connector Nd software arrived today, will be checking for any codes that might point to why my idle is choppy
After a few days running 95, still idling ruff, odb connector Nd software arrived today, will be checking for any codes that might point to why my idle is choppy
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Hey mate did you end up working this out? I having a similar if not the same problem with my Vento.
Hey mate did you end up working this out? I having a similar if not the same problem with my Vento.
Unfortunately no, I've just learnt to live with it, I tracked down a vacuum leak to the breather tubes that come out of the crankcase and up into the valve train breather which helped the idle a little bit, I'll probably replace all the injectors and plugs incase one of them is malfunction. My father's hiace had a really bad hunting problem low down in the revs but was solved with fresh plugs and leads. Could you please post a video of your idle?
Have you looked at ECU relay 30 and fuel pump relay 167? My friend's Audi80 2.0 which has pretty much the same engine as yours was idling rough and drives okish. We replaced the ecu relay and problem solved.
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