How to tell if the engine is knackered ??
Posted: Mon Oct 08, 2007 12:31 pm
Hi guys
Having bought my RS4 a few months ago, in Hong Kong, i am increasingly troubled by the wear and tear of the car.
The car is quite quick although seems to run out of steam at the top end, but does have a stuttering throughout the rev range.
I bought VAGCOM and performed some logs. The fault scan shows secondary air injection system - insufficient flow codes on both banks ; and EGT short to ground error codes.
The garage i took it to said they thought it might have been clocked ( how the **** that can be done on a digital read out ...) as the general wear on the engine is high !
My recent VAGCOM logs show low peak MAF of 207 ( compared to 280/300 quoted as stock RS4) , requested boost of peak 2,100 mbar ( which seems very high) and actual boost of peak 1,400 mbar ( which seems high in absolute terms but low compared to requested boost above ).
My concern is that the entire thing is verging on a blowout, as it is operating at inflated and unsustainable boost, with massive leaks from the system. If it has been remapped to deliver high boost, that might be masking the otherwise leaking/knackered turbos/engine ?
Can anyone help with suggestions on what further needs to be checked to detarmine if the entire engine including turbo's has been well shagged in a previous life , and that i could be facing an entire rebuild ???
Does a compresssion test or pressure test assist with this problem ?
or i am just paranoid
GULP
Having bought my RS4 a few months ago, in Hong Kong, i am increasingly troubled by the wear and tear of the car.
The car is quite quick although seems to run out of steam at the top end, but does have a stuttering throughout the rev range.
I bought VAGCOM and performed some logs. The fault scan shows secondary air injection system - insufficient flow codes on both banks ; and EGT short to ground error codes.
The garage i took it to said they thought it might have been clocked ( how the **** that can be done on a digital read out ...) as the general wear on the engine is high !
My recent VAGCOM logs show low peak MAF of 207 ( compared to 280/300 quoted as stock RS4) , requested boost of peak 2,100 mbar ( which seems very high) and actual boost of peak 1,400 mbar ( which seems high in absolute terms but low compared to requested boost above ).
My concern is that the entire thing is verging on a blowout, as it is operating at inflated and unsustainable boost, with massive leaks from the system. If it has been remapped to deliver high boost, that might be masking the otherwise leaking/knackered turbos/engine ?
Can anyone help with suggestions on what further needs to be checked to detarmine if the entire engine including turbo's has been well shagged in a previous life , and that i could be facing an entire rebuild ???
Does a compresssion test or pressure test assist with this problem ?
or i am just paranoid
GULP
I am going through a massive learning curve here from pretty much nil !
)