Tick over erratic.

[Lovebus]

Hiya, another bloody fault now. At traffic lights, tick over erratic. I’ve taken air intake off and butterfly valve on engine appears to be jerking open and closed ever so slightly on tick over. Any suggestions good people?

Cheers in advance

[ffrenchie]

MAF sensor probably, try disconnecting it.

[polar]

You need to get the diag done really as it could be anything - is it a 1.6hdi?

[V6BOY]

Simple things first see if you have a vacuum leak.

[Lovebus]

You need to get the diag done really as it could be anything - is it a 1.6hdi?

Hi no it’s 1.6i petrol cheers

[polar]

You need to get the diag done really as it could be anything - is it a 1.6hdi?

Hi no it’s 1.6i petrol cheers

Okay then next the year and the milage + anything that been dont to it recently, basically you need to give as much information as possible. Then you may get more replies and some help with your problem. 

But a diag would still be a good idea.

[Lovebus]

You need to get the diag done really as it could be anything - is it a 1.6hdi?

Hi no it’s 1.6i petrol cheers

Okay then next the year and the milage + anything that been dont to it recently, basically you need to give as much information as possible. Then you may get more replies and some help with your problem. 

But a diag would still be a good idea.

Hi it's a 2004 with 108000 miles on. Was running fine until a week or so ago. Just changed cooling fan as was siezed.

[polar]

Sounds like you have knocked something recheck all your work

[dan.wfs]

What's the tick over like?

Fast tick over as if the throttle is slightly open?
Low and lumpy tick over, sounds like a bag of nuts?
Or, is the engine revving up and down?

Might give someone on here a clue. I think you have already mentioned this only happens once the engine has warmed up?