Any ideas, my idle goes up and down (300 to 900) and have a marked hesitation around 2500 to 3500 along with high petrol consumption. ICV replaced with known good: plugs & leads new; TPS new; TB cleaned; EGR ok and cleaned. No codes!! Have ordered O2 sensor + temp sender (back of engine). This is a 2004 NBFL European spec (Etna model)
Also does the TEN Gnd business apply to this model as there are no markings on my diag box.
And hello there from France as I've just joined.

 

Usually a fluctuating idle speed indicates a vacuum leak. Check all of the vacuum hoses to ensure none have come off.

I don't think the TEN GND works with the newer NB cars because they didn't have adjustable cam angle sensors. But I might be wrong because I have an NA and don't know the NBs as well.

 

Thanks for replying. No vacuum leaks. + there are other symptoms (high fuel consumption especially) which don't fit.

 

Replaced O2 sensor today and most problems have gone. Will give it a week or so to check fuel usage!! Another miracle????

 

I didn't think that was a possible cause of your symptoms.

 

Neither did I, & neither did my local garage who couldn't find the fault!