(T) Punto power issues

Hi all,

Mk 2 1.2 8v Punto recently had a HG change and cambelt change. All runs sweet for the first minute from cold, then power loss for most of the drive with intermittent regain in power which doesnt last for long. Fuel economy is absolutely awful (220 miles per tank instead of ~400 usual). Checked the plugs which had evidence of previous sooting so cleaned them up)also looked at air filter which was oily as hell - removed and changed but all to no avail.
Can anyone help?? Any help much appreciated!

Lambda sensor maybe needing replaced?

yeah suspect lambda as its not used by ther ECU till warm

Did this start after cambelt change? is it timed up correctly?

its all started since the cambelt was changed, but ran sweet no power problems for about a week, then over time the intermittent power loss became more permanant (with power being intermittent) now there's only normal power for about 1 minute from cold, then all goes to crap. Petrol consumption goes relatively normal if i drive like an OAP - no hard accelerating, and no excessive revs. But this does mean im doing under 70 on the motorway (

Who did the timing belt & HG change?

had the HG changed at garage but didnt want to pay extra £100 for cambelt so waited a week and changed it myself. all timing marks lined up and ran fine for a week then symptoms outlined above kicked in...

Maybe timing belt skipped a teeth? or your damaged the lambda while replaceing belt...

i wondered if maybe teeth had skipped but dont know why it would run for a while then loose power intermittently rather than run badly full stop. Hoping its not the sensor - silly money quotes from dealer...

Well stop guessing,get dealer to diagnose it,sort it & then you can start enjoying your car again.