Missfire/Power loss @ 4500-5500 revs

[illusion]

Hello all.
I have a 2000 plate Cupra which has a problem around the 4500-5500 revs mark.

When you reach about 4500rpm it kinda feels like a misfire and you get a definite loss of power but seems to clear after 5500rpm

It only seems to happen in 3rd - 6th.

I has been fully serviced from new by Seat, if that is important , and has 77000 miles. Also I only ever run it on Shell Optimax.

Anybody have any ideas?

 

[Lodgey180]

is it at full boost when it happens ? poss leaky dv ?

 

[vee_dub_modder]

agreed with above, recommend you get vag com on it and see the codes, could be loads of causes i'm afraid

 

[illusion]

I would guess so, but I don't have a boost gauge to be sure, but it is certainly happening when I am...ahm....pressing on shall we say

By dv do you mean dump valve?

 

[Lodgey180]

yes diverter valve / dump valve same thing lol

look for a forge 007p

 

[lewis1984]

I had the same problem with my 77000 fully serviced cupra. No codes came up on the vagcom. I changed the coils and cleaned the throttle body and i havent had a judder or miss-fire since.
Might be worth a try.

 

[lewis1984]

P.s. Tesco value 99octane is much better

 

[vee_dub_modder]

94p per litre for 99ron... i agree

 

[illusion]

Thanks for all the info gents.

Think I may start with the coil packs, then upgrade the DV.

I assume that the forge 007p DV will make a better tssssh sound (technical i know )

 

[illusion]

Is anybody using a Forge Split-R?

I quite like the look of this, but it seems most folks are running the Forge 007p.

 

[james walker]

search for split r, and make your own judgements matey

 

[Lodgey180]

be prepared for a long read tho.. lol

forge 007p or bailey dv30 are safest options tho

 

[illusion]

Christ on a bike ! Now I'm really undecided

I looks like I may have to some more research then

 

[Mr Roboto]

I had the same problem with my 77000 fully serviced cupra. No codes came up on the vagcom. I changed the coils and cleaned the throttle body and i havent had a judder or miss-fire since.
Might be worth a try.

Good point I will have to check my TB for crud!