As most of you know, I swapped out my stock 2.5 liter for a 3.0 back in December. I have not been able to track down the source of my lean running condition. I've got the classic "lean bank one, lean bank two" with misfires across the board codes. My symptoms are, crappy throttle response, surging idle when slowing down and sometimes at a stop, stuttering on light acceleration, and low idle. The engine that I installed had the matching intake manifold along with injectors and fuel rail.
So far I have:
Flashed the DME three times with different programming
Changed the fuel pump and filter
Ran several courses of Lucas injector cleaner
Done an ether vacuum leak test
Cleaned and changed the ICV several times
All of the following parts are new that I replaced on install of the engine:
DISA valve
Upper and lower intake boot
MAF sensor
Both pre-cat O2 sensors
NGK laser platinum plugs
VANOS seals
All major gaskets
PCV valve
Throttle body and gasket
All vacuum hoses
M3 timing chain tensioner
Oil pump nut
Front and rear shaft seals
What should I try next? It seems like it really is running lean and not just the computer saying so. Could I have some trash in the fuel rail? I'm thinking about pulling the fuel hose loose at the outlet side of the filter and blowing air through from the fron of the fuel rail. I'm at a bit of a loss here.
Sent from my yet to be hacked GS3.