Hi All,
I'm hinting an ongoing problem with my motor that has got me to the point where I'm ready to pack it all in and sell the f+ckin thing.
The tune is set up from speed density (mafless) but won't run without the MAF plugged in and in the intake pipe, with that it will then fire up pretty much straight away.
With the maf not in the intake line it will fire up and immediately die, not sure if its the velocity from the pipe helping or what but that's not the problem.
The car will fire up with the MAF in place, and all looks normal with the o2 sensors while they heat up and run in open loop.
It will increase idle quite a bit, and if I blip the throttle at any point it will rise and hold at around 2700rpm and slowly slowly come down if I do nothing else.
Once the car gets to temp and closed loop kicks in, i look at the left bank headers and they're bright red glowing.
The o2's both start to drop off, and the wideband on the left bank is still sitting around 16-17 which is lean but red glowing header lean at idle?
The intake is a cheap chinse copy of the sniper EFI (fabricated sheet metal) and I was chasing the idea I had a vacuum leak that was leaning it out.
I did a smoke test with a macgyvered smoke machine and found it could keep a rubber glove 3/4 inflated and the only visible smoke was coming through the throttle body shaft. Not sure if these are meant to be fully sealed or if that was the only place the smoke could go and that's normal.
No other vacuum leaks, checked brake booster line, MAP, PCV and valve breathers, no leaks.
The biggest mysery though is once the car started leaning out, I used HP Tuners to disable the injectors one by one to see if there was any data to gain from it, and there was no change to the engine noise except for a split second on disabling injector 1.
I continued to do 3,5,7 and no change then 2,4,6 & 8 expecting it to stall out but nothing... it kept going.....
Is it possible for all 8 injectors to start leaking at the same time and cause this, or do I need to find John Constantine and get an exorcism performed on this monster?