Focus stutter


Wrench Pro
VW Polo 1.4TDI
My dad ha a 55 reg 1.6 petrol focus.

When accerating there is a definate blip/hiccup and then the car continues to accelerate. When driving on motorways there are no problems.Just when pulling in any gear the car has a hiccup as if its missed a cylinder.

There are no warning lights and the garages cant find anything wrong but there is a definate issue. Any ideas (Coil pack has been changed, ant find any air leaks etc).

TBH mate I think it is just the cars characteristics.
I have a 2009 1.6 Focus Zetec and sometimes I get the same issue.
I'm unsure as to whether these engines use a knock sensor or not? (I've not done much digging to confirm this or not?)
If they do use a knock sensor then that might be worth a shot.
You've got to remember though that these cars are not exactly light so unfortunately the 1.6 engine does have to work quite hard.
When was it last serviced? Cam belt last changed etc?

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