running lean

hi guys
I wonder if anyone can help me with my lean problems ?
first of all my spec
pulsar gtir pretty much stock apart from a garrett gt2860 rollerball turbo
bogdan elbow , 3" down pipe and 2.5 back (no cat) AS 1991
and aftermarket air filter standard ecu . That's about it


sorry for rant
so my problems
I live in Nottingham and went to bobs for a check up and as follows . we set the timing to 18 deg as was a bit out . reset tps did the first run and was running out at 13s on afr at boost so we changed the following
fuel pump , fuel filter in tank and out , checked volts at pump 11.9 ,checked fuel lines all ok , pressure regulator, fuel rail ,plugs, maf , air filter , 540 injectors ,pressure test even changed ecu and still the same . After all the hard work , time , 24 hours ,effort that bob and lee put in we were all scratching our heads with the same results

so if anyone anyone can hep please let me know cheers dave

You try a different Ecu. 11.9 at pump did you try direct feed to pump ? What make injectors ?

tried ecu
ran 12v direct
standard 444 injectors
still same

I had this on my last R...was clogged fuel injectors. Got them rebuilt and cleaned and they were as good as new!

check fuel lines for blockage with air nozzle, stick a fuel pressure guage in & run a scope on the pump and check voltage, current draw over motor commutator pulses, if that A1 healthy and fuel pressure does stay solid and fuel lines not partially blocked then look at ecu water temp signal, lambda and maf wiring and maf signal ecu actually getting, wouldn't rule out injectors unless test them, can do relative injector test which basically balance tests flow between all 4 while on car, swapping parts can lead you in wrong direction as many times swapped part still not A1 .

we put a fuel reg reg on it and it held pressure and a 12v direct feed from a jump pack and multi metre at 12 v . Changed injectors for bigger ones but still same trying to get hold of new lambda at the mo
she is driving me mad don't know what else to do

I've used this lambda few times and it works fine (I assume you're after narrowband)

http://www.ecolambda.co.uk/main/ecosale/price.pl?item=250-23880

But tbh lambda is only controlling fueling till circa 3k revs after that it goes in to open loop.

I know it might sound stupid but is your afr gauge calibrated ok? I've had hell of a problem lately with innovate.