I'm presently having some problems with my 2006 Ford Focus c-Max 1.6 petrol (30,000 miles) and I wonder whether anyone else has had any similar problems?
It started a few weeks back when the car would occasionally stall when slowing down (particularly slowing from speed). Normally this would happen when approaching a roundabout or similar which was not only dangerous but often difficult to negotiate out of !
I'm a reasonable DIY mechanic and so checked all of the usual bits plugs, leads, air fliter, throttle body (for soot / debris) and did a battery & alternator check) All seemed ok so we took the car to a local independant garage (Nationwide) who plugged it in but could not find a problem.
The issue worsened and developed into what could be described as a sort of misfire (butterfly style sensation felt through the floor of the car through the driving range and at idle). This was worse when travelling up hill etc. The car also seemed to lack urgency when accelerator depressed (as if power not getting through to the road wheels). When at idle the car would stall or try to stall if power was drawn from somewhere (i.e. elec windows operated). You can hear the slight misfire via the exhaust.
We gave in and took the car to the dealer who charged us £100 just to plug it in! They said that faults were showing for the TMAP sensor and the HEGO O2 sensor. Both replaced and £500 later (!) we collected the car. However, the problem persists and if anything it seems worse with fuel economy now through the floor (1/4 tank to 50 miles!).
We took it back to the dealer who plugged it in and found no faults. They suggested that the fault was the spark plus. Reluctant to fork out again I did these myself today (only cost me £10 as opposed t £100+ dealer price!).
The old plugs looked ok when I took them out but I still put new Bosch Super plus plugs (correctly gapped at 1.3mm> These have made no real improvement on the problem though I concede the car does seem to respond a little better than before.
I've ordered an ignition coil pack in the hope that it could be this. (Mine is the single square coil rather than the pencil coils fitted to larger focus engines). I was also going to change the leads if this does not work but they [i]look[/i] fine.
Does anyone have any other suggestions or has anyone had any similar issues?
My model has no MAF sensor or Idle control sensor (things that have plauged me on prior cars!) and I'm at a bit of a loss (and £500+ down so far!!).
Grateful for any advice.
Thanks and regards [/size]