2000z28jde

Hey there, just recently got myself into a 2000 Z28 camaro LS1. Just replaced the alternator, fuel pump, and ps pump. But now I have a SES light for the o2 sensors bank 1 and 2. I've been reading that it could be caused from an Intake manifold vacuum leak. Any thoughts? At idle it usually drops to a rough 500 range RPM idle. And i can also hear a hissing sound from the top end of the engine.

Been a bit of a headache, love any help i can get!

2000z28jde

Forgot to include i dont quit remember the code for the SES. i believe p0103? or something like that? The guy at pep boys didnt tell me much. (Only place i could find to read the code right then)

demonspeed

iTrader: (7)

Hissing sound might be AIR pump related. This could also cause problems with the front O2 sensor readings. The idle would also be affected due to vacuum leak since the AIR system pulls vacuum from the intake manifold.

I would just trace those AIR lines to see if you may have left something loose or unplugged.

2000z28jde

The only hose i pulled when i had done the initial work on the alternator and the ps pump was pulling the hose from the where it connects to the baffles(if that is the correct component). And i made sure to reconnect that.

I pulled the fuse for the air pump and i can still hear it. it doesnt sound so much as a hissing. Im not really sure how to explain it but i pulled the pump fuse and still can hear it and the car still is running funny. Is that not a good way to look for the leak or is that showing me that it isnt the air pump?

2000z28jde

Update on the codes : P0171, P0131, and P1133. if that gives anyone any ideas

1 FMF

iTrader: (1)

those codes all point to bank 1, mostly the upstream o2 sensor is not working.

being car is over 10 years old, and you didn't say how many miles on it or what it's past history is or if it's been modded... i would buy 2 new o2 sensors from rockauto. the upstream pre-cat o2's. those are the ones that matter and will greatly affect engine performance and fuel mileage. also check the wiring going to those upstream o2 sensors and make sure the connectors are in good condition and none of the wiring is chaffed, if it is then look at getting replacement connector and/or repair wiring.

2000z28jde

i guess that might help posting that info. Bone stock, with 160xxx. but even if that is the problem what about the sound? would the 02s be making it to where it sounds like its sucking in excess air somewhere? or could that be a whole new beast?

2000z28jde

also any advice on a good brand for o2s?

RevGTO

iTrader: (12)

Denso

demonspeed

iTrader: (7)

My car showed front O2 codes when the AIR check valves needed replaced. Just another option to check on before spending the money on O2 sensors.

I prefer sticking with OE, FWIW; ACDelco 213-810 if you ever plan on headers.

2000z28jde

I just find it weird that I pulled the fuse on the air pump and I'm still hearing it. I have a feeling it's the intake still.

2000z28jde

Doing the intake mani gaskets and hitting my leaky valve cover while I'm at it and the oil change. Hopefully she'll run better after

2000z28jde

Quick update: changed the mani gaskets as I said, lost time and ambition to hit the valve covers. Runs a lot better, but once and a while still drops rpms a little. And ses still on. Tomorrow plan to do an egr/ air pump delete. And putting an slp air lid on and cutting the box for ram air