engine cutting out?

[Razzo4112]

My aby coupe has started playing odd....
when boosting to near 1 bar, the engine suddenly cuts all power (doesnt stall). once this happens the engine will continue to "cut out" at 0.5 bar until the engine is re-started. once re-started it will boost to near 1 bar again then continue to do the same at 0.5 bar.
Can any one explain? is it a safety feature on the ECU?

Thanks in advance

[driftin jo]

Yes it's a safety feature, fuel cut, the ECU does this when various things go wrong.

This is caused a lot by air mass being implausible, either due to a boost leak or
a lot of the time the electrical connector to the MAF sensor, try unplugging the
connector and re plugging it a few time and take it for a drive.
Mine has done this twice and both times it was the connector, it may be you have a boost leak but as I found out, after spending hours looking only to fine I did not have a leak, it is better to check the connector first as it is a simple fix.
The other reason if you have no leaks is the the MAF sensor is dead.

[UrS4boy]

Could be a boost leak OR a dirty MAF or MAF connection. Check and clean the MAF first:

http://forums.quattroworld.com/s4s6/msgs/20442.phtml

[Razzo4112]

Thanks alot guys i will have a look!
Whats the best way to go about looking for a boost leak if that is the case?

[AndyP]

Search on here for 'boost leak test kit' I used to sell them but I don't have any at the moment, I've sold hundreds over the years so I'm sure someone local will be able to lend you one.

[Razzo4112]

20120904_193230.jpg

Also discovered a blanking plug and a sealed hose. iam guessing thats where the blow-off valve goes? could this be linked?

[Razzo4112]

brilliant i will have a look andy!

[UrS4boy]

Also discovered a blanking plug and a sealed hose. iam guessing thats where the blow-off valve goes? could this be linked?

Can't see what you see in that photo. Needs more FLASH.

There is a connection between the boost system, the BPV and the PVC system so anything is possible. http://forums.quattroworld.com/s4s6/msgs/22506.phtml