Lift are staying at 25
You would need one hellacious vacuum leak to
put you 25% lean, at any kind of open throttle.
Sounds more like the MAF is dead or disconnected,
O2s got killed or fuel supply is way weak.
Use ATAP to view the MAF output frequency, raw;
should be abour 2500Hz on an A4, maybe about
1500-2000 on a M6 (I only know the A4 for sure).
If you see a sane number at idle and it moves up
w/ throttle, MAF is hooked up & live.
View O2 sensors. They should bounce all over at
idle once warmed up. If they never get up over
500mV the car will think it's lean regardless of fact.
Lead, silicone poisoning will kill O2s, low temps will
make them "sleepy". Some time at high output will
bring "sleepy" ones around, until they cool off again.
A burnt O2 wire can make an output short, etc.
Gross fuel pump weakness, kinked / crushed line,
way-crusty filter could make for a fuel shortfall
but this is big, and even a poor fuel system ought
to be able to feed idle OK. So I would not expect
this one to be in the mix. Single dead injector
could add enough excess O2 to fake out engine
management, we can come back to this if neither
of the 2 best guesses pan out.
put you 25% lean, at any kind of open throttle.
Sounds more like the MAF is dead or disconnected,
O2s got killed or fuel supply is way weak.
Use ATAP to view the MAF output frequency, raw;
should be abour 2500Hz on an A4, maybe about
1500-2000 on a M6 (I only know the A4 for sure).
If you see a sane number at idle and it moves up
w/ throttle, MAF is hooked up & live.
View O2 sensors. They should bounce all over at
idle once warmed up. If they never get up over
500mV the car will think it's lean regardless of fact.
Lead, silicone poisoning will kill O2s, low temps will
make them "sleepy". Some time at high output will
bring "sleepy" ones around, until they cool off again.
A burnt O2 wire can make an output short, etc.
Gross fuel pump weakness, kinked / crushed line,
way-crusty filter could make for a fuel shortfall
but this is big, and even a poor fuel system ought
to be able to feed idle OK. So I would not expect
this one to be in the mix. Single dead injector
could add enough excess O2 to fake out engine
management, we can come back to this if neither
of the 2 best guesses pan out.
Well it is a new intake on the car and new computer wireing harness and computer. The thing is the computer is set up for a lot bigger motor then what i have. Now it back fires a little when i let off of the gas i auto taped it for about 5 min if some one wants to look at it and tell me what is going on.
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