| Throttle position is closed - good. This means that the ECU is running open loop ignoring the o2 sensors as it should be. Looking at the video, it looks like your AFRs look normal off idle, but are really lean at idle just before it stalls. Off idle your car goes back into closed loop mode so your o2s adjust your fuel, so it makes sense that your AFRs look normal when you rev it. Back at idle you are back in open loop mode so the ECU ignores the o2 sensors and stops adding fuel. Given that you have already eliminated unmetered air (boost leak test) then your engine must not be getting the fuel that the ECU thinks that it is sending. Are you confident all six injectors are firing? If "yes" then check fuel pressure or for a clogged filter. If you unplug both TPS plugs does it idle better? (I think that this will force you back into closed loop mode and your o2 sensors will tell the ECU to start adding fuel) That's my best guess ... Hope it helps
 ConVerTT - 93 Hi Compression TT Convertible (black)
XtraVerTT - 93 Hi Compression TT Convertible (glacier white)
SlickTTop - 96 OBD1 TT Slicktop (black)
Old Yeller - 90 Slicktop NA (PGY) And their hot Asian Cousin - 01 Acura NSX NA |
