Hi all.
I have this Polo that has failed NCT (our version of the MOT) because they cannot hold the revs between 2.5K and 3K (car wont pass anyway it needs a proper cat).
I know these 1.2 engines are hard to keep steady but this car jumps straight from 2.4K to 3.8K
Previous garage has replaced throttle body and both lambdas and a (spurious)catalytic converter .
I have checked everything.There are no fault codes.
Cam timing verified using WPS, MAP sensor verified vs actual manifold vacuum. Smoke tested manifold. Load tested all wiring associated with engine control.
I updated the engine control unit to the latest software.
Checked another car (Fabia 1.2 AWY), it was similar.
Our VW dealer reckons they have never come across this. I am just wondering if anyone else has seen this issue or better again cured this fault?
Regards
Fiachra