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1979Damian

MK2.5 1.8 petrol hanging onto revs

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Hi all,

The wife's MK2.5 1.8 petrol Focus seems to be misbehaving.  Basically when changing gear the car continues to rev as if the throttle is still being applied (for about a second or so).

Basically when I come off the power and press the clutch, the revs will typically increase by 200-300 RPM for a second or so, before starting to drop down again.  The revs seems to be a little slow to drop as well, although I'm used to driving a TDCi so tat might just be me.  I'm wanting to get it sorted as it can't be doing the clutch plate any good.

So far I've carried out the following steps to try and resolve it without any major success:

  • Removed the throttle body, given it a good clean (it was covered in black crud internally), cleared the learned values using Forscan and following the reinitialisation procedure.  (the car drives a little more smoothly but gear changes still don't "feel" right.
  • Forscan telemetry confirmed that the throttle pedal position is being reported correctly with no lag.
  • The difference between the requested throttle body position and its actual position is less than 1%, it also adjusts quickly so it doesn't appear that the butterfly valve is sticking.

Has anyone got any further suggestions, I know this engine doesn't have an ICV so I guess I'd need to be looking at hoses (oh and there is not noticeable hissing when the throttle is applied).

EDIT: I've found several references online to the "Power Steering Pressure Switch" sometimes causing this issue, any thoughts?

Any helpful suggestions will be much appreciated!

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