Hi, me and my girl took a drive and my s2 coupe.. started dying off on me as soon as I got just a little boost, we're talking like 0,4 bar.. usually it boosts 1.6bar no prob.. now its just failing to ignite BADLY.. Pelle REALLY helped me out in the garage since then.. swapping out the following to reach a solution to the problem but NOTHING has improved the situation.. so far we swapped out:
# MAF
# lambda
# ignition leads
# ignition coil
# spark plugs
# rotor
# distributor cap
# MFTS (plus re-soldering the connections as they were a bit corroded)
# engine-head-sensor (on the back of the head)
# both knock sensors
# checked vaccum leakage
# swapped chips in the ECU
nothing does any improvement.. we even took off the exhaust if the cat had failed.. we checked the turbo.. nothing ):
The car runs as sweetly as EVER on idle.. but JUST as I get just a little boost.. it fails.. we were thinking about looking at the fuel pump and fuel filter next.. (I did just change to an RS2 fuel pump and filter just some months ago..) Pelle mentioned altitude sensor.. could it really cause these sympthoms? Should we perhaps messure AFR? lambda looked a bit white..?
Gotta write a thread at this point and ask for ANY ideas/suggestions, please, as we're kinda running out of ideas );
//A
# MAF
# lambda
# ignition leads
# ignition coil
# spark plugs
# rotor
# distributor cap
# MFTS (plus re-soldering the connections as they were a bit corroded)
# engine-head-sensor (on the back of the head)
# both knock sensors
# checked vaccum leakage
# swapped chips in the ECU
nothing does any improvement.. we even took off the exhaust if the cat had failed.. we checked the turbo.. nothing ):
The car runs as sweetly as EVER on idle.. but JUST as I get just a little boost.. it fails.. we were thinking about looking at the fuel pump and fuel filter next.. (I did just change to an RS2 fuel pump and filter just some months ago..) Pelle mentioned altitude sensor.. could it really cause these sympthoms? Should we perhaps messure AFR? lambda looked a bit white..?
Gotta write a thread at this point and ask for ANY ideas/suggestions, please, as we're kinda running out of ideas );
//A
If it occurs on half throttle also i would suggest the throttle position sensor.. are you sure all air lines are ok especially the small air line to the ecu is not stuck? 
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