Leon FR 1.4 2014 stutters at 4k rpm
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You say two-cylinder more is activating, how do you know? Is the tell-tale light on the dash activating under acceleration? Shouldn't be. It should only activate when the engine is under very low load. As soon as you ask for power it should switch back to four cylinders and you shouldn't feel the transition at all.
I don't know the ins and outs of the system but it's very finely tuned. You need special kit to replace the timing belt and typically only dealers and VAG specialists have it. If an independent garage changed the timing belt assuming it's just like any other car it's possible they didn't get it right and the system is not working correctly. Check the service record. If Joe Blogs changed that belt I think I'd be taking the car to a dealer or VAG specialist to have the ACT system checked.
I would suggest faulty injectors too but I can't see that putting the ACT light on.
I don't know the ins and outs of the system but it's very finely tuned. You need special kit to replace the timing belt and typically only dealers and VAG specialists have it. If an independent garage changed the timing belt assuming it's just like any other car it's possible they didn't get it right and the system is not working correctly. Check the service record. If Joe Blogs changed that belt I think I'd be taking the car to a dealer or VAG specialist to have the ACT system checked.
I would suggest faulty injectors too but I can't see that putting the ACT light on.
Yeah the light is activating but it's not all the time which is confusing me I've also just realised I can't hear the diverter valve opening I had a look at the actuator rod there's a bit of play in it and when I rev the car and let off it's not opening but I'm also not getting surge back through the turbo. And yes the timing belt was done but that was at 100k Kms. I bought the car from a garage so I do have warranty on it but not for long I will be going back to him with it. Should I go to a seat dealer first and ask them to have a quick look?
The ACT light does come on and off. It just depends when. It should only come on under very light load. As soon as you press the accelerator it should go out.
The actuator rod on the turbo does have play on it, it's supposed to be like that. They can stick. My son's stuck. Worked some high-temp grease into it and it's been fine since. I don't know if that could cause your symptoms but worth checking.
From my experience, dealers are not very good at fault finding. Anything much outside of routine maintenance and they're stumped. I'd be inclined to trust an independent VAG specialist more.
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