My 03 plate vRS seems to have a slight hesitation or flat spot at about 2800-3000 rpm. I can hear the turbo spinning up before that (about 1800 rpm) but the car seems to hesitate for a fraction of a second then goes again.

Sometimes I can hear the turbo/wastegate louder then other times and sometimes the car feels more responsive then others, I don’t know if this is related to the hesitation but does seem to be?

I have done a few searches on and found lots about cleaning the throttle body so I cleaned it at the weekend following an excellent guide I found on here (thanks chicken_eyebrow ) and mine has loads of black solid mess in it so it needed a good clean anyway but this has not made any difference to the flat spot.

Does anyone have any other ideas? I have some sort of boost leak somewhere and how would I find/fix it if that was the case?

Thanks

Edited 29 March, 201016 yr by Nickbes

Is the car standard or remapped?

Have you got access to a fault code reader or someone with VAG-Com that can scan it?

If you can get it fault code scanned it may show a 17705 fault code which is usually a leaking hose, but there are a lot of hoses to check that's for sure! If it has no fault codes then it's going to be harder narrowing it down.

Is the car standard or remapped?

Have you got access to a fault code reader or someone with VAG-Com that can scan it?

If you can get it fault code scanned it may show a 17705 fault code which is usually a leaking hose, but there are a lot of hoses to check that's for sure! If it has no fault codes then it's going to be harder narrowing it down.

I have only had it a week, i thought it was standard but when my mate drove it who used to have a vRS himself he said it felt a bit quicker then his and you can hear the wastegate dumping louder then his one IIRC? its has a green panel filter in it but a standard dump valve as far as i can see?

I don't know anyone with VAG-Com but I do have an OBD2 reader myself, i might try that and see if i get any codes up, thanks.

The green panel filter does make it a bit louder, I put one in mine the other week and can hear the turbo spooling up a bit louder than it was with the OEM filter.

Let us know what fault codes (if any) come up.

Had a similar problem with my standard vrs, slight hesitation, some days worse than others. Thought at first it may have been a split pipe but couldn't see anything visible. Serviced it last week and changed the following......

Spark plugs, oil and filter, air filter, dump valve(as i had a standard spare one kicking round), cleaned throttle body (fairly coked up).

After running around in it a few days the problem seems to have gone away, Most likely to have been plugs or throttle body in my case.

looking around all the vag forums , i found a lot of people fitted a 4 bar fuel pressure regulator on mapped cars to solve the problem and it worked on mine

but if you put a 4 bar reg on it then it will overfuel if it hasnt been mapped for a 4 bar reg !!!!

but if you put a 4 bar reg on it then it will overfuel if it hasnt been mapped for a 4 bar reg !!!!

thats just saved me starting a thread cheers

The green panel filter does make it a bit louder, I put one in mine the other week and can hear the turbo spooling up a bit louder than it was with the OEM filter.

Let us know what fault codes (if any) come up.

Thanks for the information people, I know it's not the same as vag-com but I did plug my OBD2 reader in tonight and there was no fault codes at all.

It's having an oil/filter change at the weekend if that doesn't help I'll change the spark plugs next lol

better to over fuel a bit than run lean and the regulator will only make sure there is enough pressure at the rail for the injectors so i dont think it would over fuel

Edited 29 March, 201016 yr by stig1