If I haven't been straight enough about it before, or people haven't reached the same conclusions as me, it's time to be straightforward and forthright about the relationship between MAF, MAP and o2 sensors as far as fuel delivery:
If any of them aren't working correctly, or the numbers the ECU reads from them don't jive with what the factory has programmed it to be happy with, fuel delivery will default to maximum to protect the engine.
This is why I'm an advocate of keeping a clean MAF, using a MAP enhancer circuit, and putting an EFIE on upstream o2 sensors. The groove makes a waveform in the intake manifold that the computer may not understand based on what the MAP is telling it - we can correct/modify the signal to the ECU. further, because we cause a lean burn condition, the o2 sees more oxygen in exhaust and tries to correct for that by delivering more fuel - again, we can correct what the sensor sees.
if any vehicle doesn't respond to the groove, assuming there are no vacuum leaks or other maintenance deficiencies/defects that need correcting, the computer must be fooled by electronic hacks. MUST.
