joseph1

ok well i went to a dealership to have my car diagnosed and i got absolutely nooooo where.. my car is throwing up a p0131, p0137, p0151, p0157 the only thing the told me was its my o2s reading low voltage... well no kiddding i knew that weeks ago... but they said i should replace them they showed me on there scanner that it was jumping slow and dropping to low 60s on the voltage or whatever.. but the thing is if the car is acctually leaning out ... wouldnt that drop the voltage on the scanner... i dono what to do to fix it.. this is making me crazy!!!!!!!!

dutinsss

iTrader: (2)

O2's could cause it to run either lean or rich. probably need to get a good set of front O2's.

joseph1

i checked for vacuum leaks because how bad it stumbles and hesitates . couldn't find anything yet.. and my fuel system is 60 psi a few months back my friend put in some oe boshe o2 sensors.. and it was doing the same thing before he installed them...but before he changed them all out it was only reading one bad one ........so as of now i have tried these fallowing things...

Ok ..
I cleaned the mass air flow sensor
I checked fuel pressure 60 psi all the time
I ran injector cleanor threw it
I also deleted the pcv system.
..

Only mod is borla exaust

things i think it could possibly be

mass air flow messed up
spark plug wires
egr vac leak
maybe a short in the o2 sensors wires
o2 sensors

any other things you think might be able to fix this would be very appreciated...

dutinsss

iTrader: (2)

are you sure you didn't leave any open vacuum leaks when you deleted the pcv system? i would do a THOROUGH check for vacuum leaks first.

lemons12

iTrader: (71)

Unplug the maf.. If it runs better, its bad and replace it.

babbage1109

iTrader: (11)

Unplug the MAf while it's running

joseph1

no i did not leave any open vacuum leaks but will recheck..

ok ill go try to unplug the mass air right now

lemons12

iTrader: (71)

Turn car on. Let idle for 30 seconds.. unplug maf.. let idle for 30 seconds. If it clears up maf is bad. If it stays same or is worse. You have another issue.

joseph1

omg you guys are freaking genius !!!! i unplugged it and it ran like a freaking maniac and i tried to get the lean codes to pop back up and the only code that came up was the messed up mas air... omg im soooo freaking happy thank you so much..

so on another note... what kind of maf should i get and suggestions ?

babbage1109

iTrader: (11)

Beat me to it

lemons12

iTrader: (71)

A stock replacement. You can get them on here all day for 30-40$ shipped.

I don't recommend changing to a different maf unless you are going to retune for it. In that case a zo6 or truck maf is the best bang for the buck.

Post here before going to the dealer, that was obvious.. 95% of techs at them are a joke at best.

lemons12

iTrader: (71)

don't clean the maf again.. Good chance of doing more harm than good, they are very sensitive.

joseph1

larry green in Blythe cali ... they are rediculas....but ya im replacing it tomorrow ...

PROFESSORCHAOS

i had the same problem about a month ago with my car, it ended up being a loose fused(which also affected my a/c) and the maf needed to be cleaned.