Siamanis

What are expected numbers?

jsetzer

128

Siamanis

Sorry, you must be thinking of something else. The margin cant be that high.

Siamanis

@ idle. +/- 5%?

jsetzer

Arg.. Change your units.

128 was the correct answer. Which is +/- 0.

I don't have a recent log file at work but on one of my older ones on the new motor shows @ -4% at idle. Which would be a little rich, but not too bad.

Something like 120 count.

Siamanis

Stock applications not on the lean side?

Siamanis

I have had a Bank 2 sensor 2 code for a while for a circuit malfuncion (stuck signal). Thats just cat efficiency though. Every once and a while I will get the Bank 2 lean code (comes and goes).

Just today I noticed a stumbling idle: 820-700 RPM's so I logged data with a GM Tech 2. I noticed that my LTFT (Long Range Fuel Trim) seemed high (Bank 1 @ 23% and Bank 2 @ 25% (pegged).

I have been told that Cat over temp could be the problem but why would there be a Bank 2 lean condition and the bank one LTFT (Long Range Fuel Trim) so high?

Non OE parts: K&N air filter, Gran. MAF, MSD coil and wires, NGKTR55's, a cutout, and crapmaster.

jsetzer

Ya, thats saying that the 02 sensors are seeing a lean condition, and since its pegged at 25% it can't add any more fuel to make up for the lean.

How long has that MAF been on there? Thats the only mod that I see that could cause a problem.

How many miles no the car? Could be a fuel pump going out. I would check your fuel pressure. You will need to borrow/rent/buy a gauge to do so.

Can you read your 02s with that? Are they bouncing between .100-.900ish? Or are they pegged at one end ot the scale? They should go back and forth.

Ever changed the fuel filter? Good idea, even if it doesn't fix your problem would be to change the filter and run some injector cleaner through the motor.

Siamanis

The MAF has been on there for about 2 years I think.
The fuel filter is less than a month old.
The fuel pump is about a year old.
Yes, you can read the 02's with the Tech 2, all are fine but the Bank 2 Sensor 2 which is has a stuck signal of 442 I think it was.
I could throw some injector cleaner in there tomorrow - I have to fill up anyway.

jsetzer

Thats right, you are a 2 cat car, so you have a sensor after the cats? Sorry, I haven't dealt much with them.

Clogged cat do this?

Siamanis

Could it? That would explain the stumble at idle correct? Ill have to look under there for pretty red lights.

EDIT: But why the +23% on Bank 1 when the problem sensor (and possible converter) are on Bank 2?

Injuneer

Why do you keep trying to connect the dead after-cat sensor on Bank 2 to the "lean" condition? The after-cat sensors don't control anything.

I answered this same question for you on another forum, and apparently wasted a lot of time explaining how the system works, when you apparently already know. Rather than asking a vague question like you did, why not put a description of the problem up front and let people spend their time addressing the problem, rather than the fuzzy question?

Siamanis

If you dont want to help, dont post. If you feel you are a waste of time then. The reason why is that the Bank 2 Sensor 2 is bad (stuck signal or "circuit malfunction") Could the cat have gone bad? If it is a stuck signal, couldent the cat be clogged? Couldent the PCM be falsely reading the O2 and therefore trying to keep the converter cool with more fuel? Whats your problem sir? Get your panties out of a bundle...

Injuneer

I did want to help, but you lacked the courtesy to clearly identify your problem. You wasted my time.... next time I'll know better.

You are a complete douche.... someone tries to help you and you insult them. Good way for a newbie to build a reputation.

Siamanis

BS. I asked a simple question (what are the expected or marginal numbers) and you went into depth as you wanted. I just asked for some damn numbers man, I didn’t need an in-depth explanation. I posted on two multiple boards because I wanted an answer fast. What’s the problem with that? YOU are being inconsiderate, YOU are being arrogant, and YOU are being "a douche." I do not understand why sure a highly reputable F-Body message board would carry such a burden on themselves. I am not the one to argue on the internet, so I am done here. Keep it cool next time and don’t mistake people for morons because assuming it will turn you into one. I will find better information elsewhere.