At approximately 2500rpm I can feel a pulsing sensation as if the car is speeding up then slowing down quickly. Any ideas? It's a P1.
Cheers,
G

 

Hi mate,

Probably a silly question but are you letting the car fully warm up?

 

Of course

 

Quite a light sensation under gentle acceleration or something stronger on full throttle ?

The former is likely to just be the ECU alternating each side of the stoich ratio as it reads from the lambda sensor. If you have a lamba link or AFR gauge you can see the mixture lean and richen in time with the pulsing.

 

Exactly what Avalanche has said - I get a light pulsing when the car is stone cold and yes it pulses in time with my AFR swinging back and forth. After a minute or so all is fine