Thread: SR 20ve leans out in high rpm

things done today,changed plugs and gas filter,checked all the fuel lines for blockage by running compressed air thru it,also did the fuel rail,no blockage.
things to do 2mr: check maf wiring,hopefully install a new rail
someone told me that the o2 sensor may be bad or the coolant temp sensor

generally 02 and temp problems will tend to go rich (bad fuel economy)

got ecu talk? check them and maf live..

oh ok..actually the car IS rich down low very rich so im having very bad gas mileage

i just put a o2 sensor in mine.check out this vid.it shows temp(12 o'clock) afm
(3 o'clock),o2 middle.the o2 should swing (rich, lean,rich,lean) at stable rpm,without ending up off the scale.
there's a list of approx afm voltages (for different afm's) in the manifesto somewhere
hope this helps.

If it's at the primary it will kill power. Learned that the hard way back in the day with my Hotshot header lol.

looks like your o2 isnt right as it should jump between 0.3 to 0.7v once up to temp, yours is zeroing out

.....phone.....

Have you done the inspection on wiring ?
Or try...
Dedicated power line to o2 sensor, ground to your ecu and signal to correct wire.


KennyX

think you'll find they all do this backing off from speed.check a few out on youtube..

my wideband goes fully into lean (20.0:1) when lifting off into engine deceleration but my narrowband only ever goes as low as 0.2V during this time, also under full load it never goes above ~0.8V

found a short in the maf wiring but the still didnt solve the problem