I drive 1.8 Mondeo Duratec petrol its done 160,000 miles and up until about 3 weeks ago it was operating perfectly and acceleration was fine.
However, when you put your foot flat to the floorpan (on the accelerator) in third gear (it is most noticeable) it revs up to 4000rpm swiftly and smoothly, but then it only creeps up to 5000rpm, and you can feel it holding back. If you keep your foot in there planted, it gradually arrives at 5000rpm, then it seems to overcome the problem and revs cleanly again almost to 6000rpm (redline @6250 or 6100 ish)
When you get up to say 5,500/6000 rpm and then change up into 4th gear it dies again and loses its power, but then regains it again once it breaks through the 4,500/5000 rpm sector.
Furthermore, at much lower speeds, when say approaching a roundabout with a reasonable amount of roadspeed but low revs on the overrun in third, and then when you see the road ahead is clear you accelerate away, it starts to Pink momentarily.
I have replaced a short piece of vaccum pipe, replaced the spark plugs and the leads, but still it persists.
There is a vacuum unit sat just behind No:4 Cylinder which has a nylon knuckle joint mounted vertically just under the coil area, how likely is it that this unit (if the diaphragm has split) could be a contributor ? It is a sealed unit and can not be dismantled as far as I can tell, the body is made of plastic.
Thanks - Anybody got any bright ideas. ??