Classic

iTrader: (3)

Well I figured I would see if you guys can figure out what the problem is. Here is the background -- just finished installing a twin turbo setup on my 2000 trans am. The passenger side manifold heats up to red hot after idling for about 5 minutes -- meanwhile the drivers side is perfect.

So after checking everything mechaical and fuel wise (pressure, leaks, injectors, etc)I'm down to the tuning. My 02 readings on the drivers side are in the 450 mv range, and the passenger side is reading 900mv. So my question is how can the one side be getting more fuel than the other?? There is no way in the computer to seperate bank to bank correct?

ANY and I mean ANY ideas would be greatly appreciated as I am down to my last straw.

Another_User

Red hot should mean you are running lean. Your O2s being so high does suggest that it is rich. You may want to consider the possibility of an exhaust leak. Do you hear anything that sounds like an exhaust leak? Otherwise you may want to see if your O2 go damaged during reinstallation.

Sport Side

iTrader: (6)

I have a similar question, but my readings aren't so far apart. Is it normal to see 890 on one bank and 920 on the other, or should they be closer and stay more towards equal at WOT. Maybe my sensors were damaged like you mentioned to classic?

sry to highjack

Classic

iTrader: (3)

tried 3 different 02 sensors all with the same results. Been through the whole think over and over looking or an exhaust leak. If you look in my posts in the Forced Induction section you will see a lot more detail about whats going on if that helps.

monodax

With reading that differ as much as you mention here it is very likely an exhaust leak and/or placement/heating issue with the O2 sensor. Did you first check all your signals going to the O2 sensors to ensure that you have all the proper voltages? You should have a 5V DC Heater Signal, 5V DC Reference Signal, Heater (-) Ground, and PCM Input wire (0-1V DC) which is what you are viewing on your scanning software.

Classic

iTrader: (3)

Had a brainstorm -- the 02 sensor may be getting "fresh" air hitting it causing it to dump fuel.

Another_User

Like if you had an exhaust leak.

Classic

iTrader: (3)

Yes, but its not a leak up top, it might be a leak where I had to modify the downpipe.

Pro Stock John

iTrader: (34)

If the 02 value sits at 450 all the time it's not working. That is the default value. You in that case since you changed the sensors have a burned or messed up 02 harness. The passenger side 02 harness is in that foil wrapped cluster that runs down by #6. My guess is that burned one of those wires. Have you popped a fuse too?

jimmyblue

iTrader: (11)

With very different exhaust temps you will have very
different narrowband O2 sensor outputs. Not to be
trusted, as far as any bank-bank difference they
might imply.

Is there any plumbing difference that might put more
backpressure on the passenger's side? Different (or
single) wastegate, etc.? Pressure = temperature to
some extent (PV=nRT) and the less the exhaust gas
can expand, the hotter it remains.

Another_User

Would locking your car out of closed loop and tuning your VE with a wideband work to fix this?

Classic

iTrader: (3)

Plumbing is the same both ways.

PSJ -- Haven't popped any fuses, 02 sensor is working (starts at default then readings level out after it heats up).

Pro Stock John

iTrader: (34)

But if the value goes to 450mv after it's warmed up there is something wrong. The value s should switch at idlle. From like 50mv to like 900mv.

Classic

iTrader: (3)

no its 450 from a dead cold (both sides) then goes to 900 on the "bad" side (passener side) before the other side even has time to heat up.