clio 172, lumpy idle speed

[curtis172]

i have mk2 clio 172, when the car is idling on tickover, it is very lumpy and not as smooth as i thought it should be, about 6-700rpm, ive not had it long and its been like it since i bought it, i looked at 4 cars before bying this one and they all seemed to tick over quite lumpy, does it need a tune up, if so what is best, or the spark plugs cleaning etc, any advice , cheers

 

[Mattieuk]

Mate...Don't panic all 172 mk2 do this.

 

[benji&eka]

yup, there're all like it, its 'cos of the mild(ish) cams

 

[thedoc]

They all run "lumpy", but you can improve things by putting posh fuel in - it works sometimes...

 

[Christopher]

not just 172 Mk2's

All F4R engines do this. Due to fueling restrictions to meet emissions and the fact the VVT system isn't the most sofisticated.

High octane fuel (optimax, bp ultimate etc) never seems to help my idle. it still shakes the car in traffic...to be honest i quite like it. lol

 

[The Bear]

Does anyone get a splutter from the exhaust, like every second or so? Mine seems to do this all the time when warm.

 

[Christopher]

yeah, i get that. even when warm.