The engine judders and gets worse over months to the point where the idling is erratic.

Car: Ford, Focus, 2006, 1.6 TI-VCT - Back to Fix-It - Ford Repair Manuals

Q.Hi, I have a 2006 Ford Focus 1.6 tivct titanium and have had an on going problem since I bought it.
The engine judders and gets slowly worse over months to the point where the idling is erratic. It has been to a Ford garage 3 times!! and each time the coil pack has been changed. the last time the plugs and leads were also changed.
This norm cures the problem for 2-3 months and then the problem starts again. Please can you suggest anything. Thanks.

I already checked/done: Coil Pack, Ignition leads, Spark plugs. Engine management reset.

AnswerThis could be an airleak after the airflow meter, any air dragged in here isn't 'seen' by the ECU and so not compensated for, causing rough running.
Check the hose clips for tightness and inspect the trunking for any cracks or splits and also all the vacuum system, the small bore pipes and fittings for cracks and missing parts.
The best way to locate a leak is to have the engine running and warm and then spray lighter gas around each joint in turn. If the engine rev's up you've found your leak.
Might also be worth cleaning out the idle speed control motor / valve as these get clogged up with carbon and some brake cleaner wa.. >> login for more

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The engine judders and gets worse over months to the point where the idling is erratic.