O1ws6

iTrader: (7)

i have a 01 ws6 with a STS, tune by fran @ RPM plus the supporting mods...

im getting 5 dtcs in my computer: P0171 left and right, P0174 left and right as well as P0300. I cant feel a missfire or hear one...

the wideband spikes out at 16.0 under hard pulls. when i drive normal i get a 15.0-15.4 and 14.7ish when i maintain. when i lift off the gas i spike rich to 10.0 and it slowly goes back to 14ish.

did my o2's take a crap on me or my computer?? im lost...

BIG_MIKE2005

iTrader: (116)

check your fuel pressure at the rail, it should be 58psi at idle.

O1ws6

iTrader: (7)

i have that at idle and under hard pulls i drop to about 52-55. i have a incar fuel pressure guage that reads from the test port

BIG_MIKE2005

iTrader: (116)

Then I'd say clean your MAF & replace your O2's. If you have LT's I suggest the Bosch 13111's they are Vette rears but have a long enough harness no extensions are needed & have a nice heat jacket over the wires instead of plastic wire loom.

O1ws6

iTrader: (7)

parts cleaner ok for maf?

BIG_MIKE2005

iTrader: (116)

No, either use a Q-tip w/Alcohol & be extremely careful or buy a can of MAF cleaner. Those things are super sensitive. I actually prefer the Q-tip method myself.