my car wont rev over 2.5k/70mph

[b21playa]

juts coming home from Asda, jump on the m'way and car seems alright, get to about 70mph in 5th gear and the car wont go past it, drop to 4th gear and car revs but wont go past 70mph

no warning lights so carried on driving (only live one junction away), and come on A roads, car feels like its being held back and not revving properly. now this has happened before and it went away after putting in neutral and revving the titts off it, but has not worked this time.

what could this be, will have to vag-com if when i get time

this is not the time i need to be dealing with stuff like this, got rear breaks to do as well, the discs have just had it

 

[muddyboots]

Does it return to normal after switching off & restarting ?

Sounds like limp mode - not sure if you'd expect a warning light though ???

 

[b21playa]

Does it return to normal after switching off & restarting ?

Sounds like limp mode - not sure if you'd expect a warning light though ???

havent tried that, but will try vag-com now

 

[sssstew]

bizzare, so its perfectly normal in every gear during acceleration right up until 70mph?

 

[b21playa]

drove it today as was fine

there was a fault code about positive deviation but i stupidly cleared the codes and forgot to record it

 

[sssstew]

overboost then... sticking turbo vanes....

 

[b21playa]

overboost then... sticking turbo vanes....

is that new turbo time?

 

[b21playa]

I got the actual faukt code:

17965 - Charge Pressure Control: Positive Deviation
P1557 - 35-00 - -

here are the plots of MAF and turbo

 

[Triple D]

if turo vanes are sticking thats what happend on my first hyrbid turbo, turbo went into th f*vkuing bin, and had to fork out £800 for a new one as they had seized

 

[b21playa]

if the turbo has gone then i would rather do the upgrade to a pd150 turbo, but want to make sure what is actually wrong before i start purchasing bits

 

[TornadoRed]

Before you replace the turbo... make sure the actuator is able to move freely. And you might check the turbo control valve (N75).

Many perfectly good turbos are replaced before their time.

Often limp mode resulting from an overboost or underboost just requires a restart for normal operation. But if it's happening every time you drive, then you need to get it fixed.

 

[Triple D]

www.allardmotorcompany.co.uk you want anything then contact these guys, top notch service and very very good at doing things with TDI's

 

[b21playa]

Before you replace the turbo... make sure the actuator is able to move freely. And you might check the turbo control valve (N75).

Many perfectly good turbos are replaced before their time.

Often limp mode resulting from an overboost or underboost just requires a restart for normal operation. But if it's happening every time you drive, then you need to get it fixed.

doesnt seem to be happending every time.

took the car out today twice and its not happened.

i'll have to look into it more later on in the month unless it happens every time

 

[fatbloke]

i had a very similar thing with a simple air leak
although vag com check has probably ruled that out

 

[b21playa]

i had a very similar thing with a simple air leak
although vag com check has probably ruled that out

been driving it around and seems fine now

 

[sssstew]

Before you replace the turbo... make sure the actuator is able to move freely. And you might check the turbo control valve (N75).

Many perfectly good turbos are replaced before their time.

Often limp mode resulting from an overboost or underboost just requires a restart for normal operation. But if it's happening every time you drive, then you need to get it fixed.

yep correct, and a good clean helps also.

 

[b21playa]

yep correct, and a good clean helps also.

how do i get to it, is there a guide about?

The car has been fine since, I would rather clean it up to make sure also before i sell the car. Still want to clean the egr valve as well

 

[sssstew]

think there will be something on tdiclub.com about cleaning. You might have done enough just by booting it around alot though....

 

[b21playa]

think there will be something on tdiclub.com about cleaning. You might have done enough just by booting it around alot though....

ok

I've decided to sell up and get a e46 bmw in about 6-months

 

[Phil 633]

Sound slike variable turbo vanes sticking due to oil residue on housing .Have known people who have removrd turbo & cleaned out by washing through with engine cleaner.