When shifting up and pressing the clutch, the revs drop very quickly instead of falling smoothly, and the needle bounces slightly. It makes rev-matching hard. When driving around 30–40 mph and lifting off the accelerator, the car also feels jerky instead of coasting smoothly. Issue gets worse with the AC on.

 

Idle is stable. Happens hot or cold. Light throttle inputs feel a bit snappy. Throttle body has been removed and cleaned. No warning lights. Diagnostic scan showed no faults. I previously had an ABS wheel-sensor code stored but no ABS light now and it hasn’t returned.

 

Before replacing sensors, I’m thinking possible MAF/MAP issue, a vacuum leak, or throttle adaptation needed. Anything common on these 1.4 Fiesta engines I should check first?

7 hours ago, Liamc96T said:

Diagnostic scan showed no faults

Was this scan done using ForScan or at a Ford dealer?

If it was done with some other diagnostic system it won't show Ford specific diagnostic codes.

Clutch switch would be my first thought.

Please post any further questions in the FIESTA forum. This is the GUIDES forum.

https://www.fordownersclub.com/forums/forum/1-ford-fiesta-club/

10 hours ago, pcaouolte said:

Was this scan done using ForScan or at a Ford dealer?

If it was done with some other diagnostic system it won't show Ford specific diagnostic codes.

It was done at my local independent garage, not a Ford dealer.

Do I need a ForScan scan to get Ford-specific codes?

6 hours ago, unofix said:

Please post any further questions in the FIESTA forum. This is the GUIDES forum.

https://www.fordownersclub.com/forums/forum/1-ford-fiesta-club/

My apologies,I will keep in mind for future.

9 hours ago, TomsFocus said:

Clutch switch would be my first thought.

Thanks Tom, I will Investigate.