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1.25 fiesta loss of power


bigdom
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hi 2012 fiesta 1.25 ,  3 k a year but I thrash the odd time , anyway loss of power going down the gears to get up hills , sounds great and sweet as get out on motorway but ooph has gone , checked everything done plugs oil the whole lot , starts stops ok no hesitantsy. on cold start up and I would say on choke it pulls great and goes up hills ok its just when heated up and as I would say chokes off its back to slow on power , obviously its getting extra fuel but that's it , I took of the maf sensor today and wd40 it and stuck it back in to no avail, tried 5 star fuel as well but no good , it use to get on motorway 60 ish down to 40,s because of small journeys the wife does its going thru the fuel now and getting noticeable . any ideas guys 

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Not sure I'd describe my old 2012 1.25 Zetec as ever having much 'oomph' but still, I assume you get it serviced regularly? Could be spark plugs or air filter if not. Otherwise fuel filter, fuel pump and injectors are all potential causes.

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yeh mate but see where i said when cars cold all seems well , so its getting more fuel or timeings advanced and car goes up hills ok so rules out fuel filter , and spark plugs . 

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Have you done any diagnostics - any error codes flagging up?

When the engine idles after warm up are the revs as normal? - seems to me to be some kind of Ecu fault where it is- as you saying adjusting timing some how


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no lites , starts first time sweet a s a pee, as I said lost its oomph and seems to be going thru juice , ford says it has an update but they don't say what for ,oh idles ok no misfires pops or bangs , took out maf sensor as it was ontop of air plenum looked ok and sprayed with wd40 for a clean dryed of and put back in , as I said everything is all ok with the car just have to give it wellie up a hill and sometimes drop a gear or 2 , , tempted to get the upgrade to see what happens , thing is on choke /cold it goes like it should do. 

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