Juddering when not under load.

Apr 7, 2025
1
0
Hi all,

Recently I've bought a 2014 seat Ibiza 1.4 TSI ACT. I've begun to notice some issues with the car. One of these issues is that when the car is not slowing down or accelerating but holding it's speed and under minimal load the engine judders like crazy. I believe it is something to do with the ACT.
There is also another issue where sometimes when I start up the car it will misfire when idling however, after revving the car it stops misfiring and drives fine I've got a slight feeling these issues may be linked because of the error codes it produces:

P11D500 - Cam Shift Actuator Outlet "A" Cylinder 2 - Range/Performance
P030000 - Random/Multiple cylinder - misfire detected
P030200 - Cyl.2 Misfire Detected

After a while I stopped getting the issue with it misfiring after starting up but changes the actuator for cylinder 2 exhaust anyway. This did not fix the juddering issue. A few days after replacing the actuator the misfire issue has happened again.

The car has also been remapped which I think may have something to do with it but any other suggestions would be great!
 
Genuine SEAT Parts and Accessories.