Slight erratic idle

[simon1963]

Hi everyone,

I’m getting a very slight erratic idle. The car feels as if it’s hunting and the needle pops up and down very slightly. It’s a 3 litre si. Does anybody else have this, is it a characteristic or a sign that maybe the plugs need changing. Otherwise runs a dream.
Thanks in advance for any suggestions.

 

[firebobby]

It could be a coil starting to break down.

 

[firebobby]

It could be a coil starting to break down.

 

[thecookie125]

Mine does the very same thing usually only on cold idle, would love to know what it is? How's your cold start sometimes mine takes an extra half a second if it's been sat for 48 hours.

 

[simon1963]

Mine does the very same thing usually only on cold idle, would love to know what it is? How's your cold start sometimes mine takes an extra half a second if it's been sat for 48 hours.

Cold starts fine. Maybe as firebobby say it’s coil packs. Might pull the plugs and have a look at those.

 

[StuCracker]

Same issue here, unfortunately not got to the bottom of if, one of my jobs for over the winter :|