My Cupra R keeps stuttering at high revs in 4th-6th gears

[CupraRmike]

Hi

I wonder whether anyone could give me some advice as to a fault I have with my Seat Leon Cupra R. When I take it on the motorway and throttle hard in 4th, 5th and 6th gears, the car stutters and jolts, like it can't feed the power through smoothly. Seat have had THREE goes at trying to correct the fault but they have failed each time! They thought it was a dump valve problem and replaced it, but it wasn't that. I'm thinking it could possibly be either spark plugs, leads or may be even a fuel injection problem? all I know is that I have been left scratching my head as to how to fix this fault.

It doesn't do it in 1st, 2nd or 3rd gears so much, only in the higher gears at 4000 revs and above. Does anybody have any idea what this could be?

The car is an 06 plate with only 22000 miles on the clock. It has had two annual main dealer services and runs on Shell V-power fuel.

Any help or advice would be greatly appreciated.

Thanks,
Mike

Edited by CupraRmike on Saturday 18th July 12:32

[stevesingo]

I would take a punt at the ignition coils. There is one per plug and they are not too reliable. Pull the plugs out and look to see if one stands out in colour. If so that could be the one.

Steve

[stevieturbo]

Obvious first place to check would be ignition. be it a plug or coilrelated issue.

Sadly most main dealers are baffled much above an oil change.

You'd be better seeking a competent tuner, or at least a competent mechanic

[Busa_Rush]

Does it revs fine if you only use a small amount of throttle with no load on the engine ? If it does and only has a problem under boost then it probably is a coil. Can be a plug too but far more likely to be coil.

Mine went the same way, reved fine but cut out under boost.

[GavinPearson]

I'd change the fuel filter.

[Dift]

Were are you from?? There maybe someone local with vagcom able to help.

[stevieturbo]

It sounds like a very simple problem. Cant see any need for vagcom.

[fliph]

I'd go for fuel filter first...

[stevesingo]

There would have to be some serious cruddy fuel going through the system to cause starvation. Especially after 22k. The coils on VAG cars are known for failing. Pulling the plugs out is cheaper than buying a fuel filter, even if you fit it yourself!

Steve

[thong]

stevieturbo said:

Obvious first place to check would be ignition. be it a plug or coilrelated issue.

Sadly most main dealers are baffled much above an oil change.

You'd be better seeking a competent tuner, or at least a competent mechanic

Steve work for a main dealer m8,and indy's for 23yrs,a competent tuner has big problem's changing the brake fluid.

[LeightonBuzzard]

GavinPearson said:

I'd change the fuel filter.

won't be this, i can almost certainly say its a coil, I can get you a VAG OEM one for 48 quid or a pattern part for 35. They are so common it's unreal and they brake up with a mix of heat and high revs, I've changed loads for many people on the engine in Golfs, TT's, ibiza's, skoda's; not hard to unbolt the allen key 5mm i think and check each coil, sometimes you can see a bend in the coil or evan a break/crack near the top. Dont recommend driving it though as you may damage the Cat,

Tom

Edited by LeightonBuzzard on Thursday 23 July 21:33