Help needed! not holding boost

[ericd]

any chance you can post up the current vag-com output ?

[iib3327]

any chance you can post up the current vag-com output ?

output of what? only fault code i get is the normal engine speed sensor nothing else at all..

[Jamo]

What recirc valve have you fitted and which way round have you fitted it?

[ericd]

output of what? only fault code i get is the normal engine speed sensor nothing else at all..

ecu software version from the "engine" module page

[S2central.net]

Didn't know it did it on ABY, cheers for the heads up

It absolutely does on ABY and ADU - the R pin is the chap.

[iib3327]

ecu software version from the "engine" module page

this one?



Jamo i'm running a alloy reserc i know is good, had a forge 007 on thier a cossie dump valve and a cheapo dump valve, thought these were all my problem so tried them all.

currently got my reserc backwards (same as my mates s2) as the chirp was getting on my nerves..lol

[S2central.net]

OK - so thats a stock ABY... Should be seeing 1.1 - 1.2 bar max on that with healthy factory setup.

Do the output tests on VAGCOM to make sure ECU can tickle the WGFV first of all.

Have you done a boost leak check yet ?

Tested the WG diaphragm ?

Tested bypass valve is airtight ?

Renewed the WGFV (old ones can be slow) ?

[S2central.net]

Oh and try disconnecting the MFTS plug to see if that brings higher boost !

If all that is good, then you are into dodgy MAF maybe - or bad/loose knock sensors giving false positives.

[iib3327]

OK - so thats a stock ABY... Should be seeing 1.1 - 1.2 bar max on that with healthy factory setup.

Do the output tests on VAGCOM to make sure ECU can tickle the WGFV first of all.

Have you done a boost leak check yet ?

Tested the WG diaphragm ?

Tested bypass valve is airtight ?

Renewed the WGFV (old ones can be slow) ?

vag com clicks the n75 and on WOT u can feel it pulse

boost leak check 4 or 5 times

vacume tested the wastgate diaphram

bypass valve? (reserce maybe?) thats all air tight

has new n75 and tried 2 others (no change)

MFTS plug (water temp one under inlet?) unplugged this no change

[Jamo]

Altitude sensor? http://www.s2forum.com/forum/showthread.php?t=31676 and check this thread http://www.s2forum.com/forum/showthread.php?t=30290

[LHD_Kid]

Also worth checking the throttle adjustment, get an assistant to push the pedal to the floor and check the throttle is properly open under the bonnet....
Chris

[iib3327]

unplugged Altitude sensor got the fault code on vagcom also here's the readouts with it connected.

throttle opens all the way just double checked too..

[S2central.net]

At this poiunt I am thinking MAF or knock sensors.

[red leader]

Did i read coolant temp -49 degrees??

[ericd]

At this poiunt I am thinking MAF or knock sensors.

IIRC vag-com's never gonna indentify a knock sensor problemright ?, might be worth a quick bulkhead check to make sure they're both firmly connected and not been covered in junk , a quick reconnect couldn't do any harm either