S2 revs staying high when changing gear

[Cullystvr]

Hi not found any posts on this so hoping it's not new.
Problem with S2
When stationary revs go up and down as normal.
When driving press the clutch and revs seem to hang at about 2000 rpm then slowly drop (couple of secs) this means is still rerving on gear change so grabs on release of clutch when changing quickly. Ok when you come to a stop at lights as the revs have dropped before you take off
Already changed cable and cleaned linkage and all seems to move freely.
Have tried a spare throttle position sensor but didn't seem to give same throttle response when stationary. Didn't road test as have heard there can be different sensors i.e gold and silver pins, original has silver pins and full ford part number and spare has gold pins and just the ford logo not sure if this is true.
Normally quite good on the S but this has got me baffled.
Any info would be appreciated.

[Cullystvr]

Thanks for that, did yours only have the symptoms when driving and fine when running stationary.

[Cullystvr]

Has anyone swapped them round 😃

[Cullystvr]

Thanks for all the info, have to check these out in the next week will update on progress next week.
Any further info would be appreciated.

[Cullystvr]

If it's a vacuum leak wouldn't the symptoms be there all the time, the engine runs very smooth all the time, the revs just don't drop quick enough when you change gear. Throttle mechanism and cable are all loose and free. One of the MAFS is very grotty so will clean them and also the idle control valve, once clean will test if still there then have a look at the throttle sensor.
All hoses are good no apparent leaks, servo is holding vacuum which was still there after 2 days when I pulled the hose off it released the vacuum. Could the grotty MAF cause this ? The other is very clean.

[Cullystvr]

Hi, the original post explained that the tick over is fine, it revs fine and returns immediately to about 1k revs when you release the throttle which is about right, new throttle cable and linkage cleaned, it is when the car is moving there is a problem, when you are driving and press the clutch the revs take time to decrease which causes gear changing problems.
Will be taking off the MAFS to clean, clean throttle pots and butterflies and idle control hopefully will sort it. If not must be wireing 😃

[Cullystvr]

Thanks for all the suggestions, I have cleaned everything, MAFS, throttle body, butterflies, linkages, idle control, and throttle position sensor, hopefully the photo has uploaded but in the process of all the cleaning found that the vacuume pipe plastic elbow into the rocker cover was split. Had a spare one so fitted and a quick spin round the block and seems ok, test drive tomorrow in the day and hopefully fixed (fingers crossed)

[Cullystvr]

Thanks glen, good to chat to you too got stuck straight into the S when I got home after the show, must have been inspired 😃
Just about to message Alan for details on the throttle linkage upgrade. I have got a spare so no problem sending it in.
Thanks again for all the info yesterday.