A/f Mix Reading Stoich-lean

[Trust33]

hi. my autometer a/f gauge is reading stoich to lean. it uesd to read stoich to rich.

i have narrowed it down to 3 possibles for my r33 gtst:

*fuel pump (which is out of an r32 gtr)

*fuel filter (about 15k old)

*02 sensor giving a false reading. (its been out before and it was rattling but that was a very long time ago and it hasn't caused me any problems as far as i know.)

now i wouldn't have a clue where to start.

Craig.

now that i think of it. when i put my foot down today it went into rich but then went back to stoich-lean as soon as my foot came off the acc

Edited December 15, 2008 by Trust33

[Trust33]

im going to change the fuel filter and clean the afm sensor with some electronics spray today.

was told that it might not be the o2 sensor only because it's purpose is to "optimize the mixture when cruising".

[QWK32]

unless it is a wideband O2 sensor i wouldn't trust what it said anyway.

Edited December 16, 2008 by QWK32

[Trust33]

it was the filter after all. saved me a hassle of changing the pump. which was my next thought.