focus erratic Idle - help please - Roly93
Focus 1.6 Zetec idles perfectly hot or cold. However when started about half an hour after having been hot, the idle see-saws around quite markedly for a while before the engine becomes hot again.

Any suggestions as to what this may be caused by ?
focus erratic Idle - help please - AlastairW
Is the air con on or off during this 'see-saw' idle period?
focus erratic Idle - help please - Roly93
The air con is always off......