Zach/90\irocZ

iTrader: (6)

Wideband and Narrowband and BLM not matching up

Wideband reading rich 12-13
Narrowband reads from 400-600mv in different cells
BLM reading above 128

I calibrated wideband twice using LC1

O2 sensor could be going bad form running rich ?

Or is it in the tune ?

I disable PE,EGR, AIR and CCP to lock on VE

O2 sensor is unknown mileage etc or don't know how long it's been running on Rich engine but it does look fairly new no more then couple thousand miles
Wideband sensor was new less than 200 miles ago

Replace spark plug wires as one got burned on headers
Other than that car runs strong and is healthy beast

Tuned Performance

iTrader: (92)

You might want to try a heated o2.

jichniow

Are you running a separate narrow band and wide band? Is one on the left header and one on the right?

If so, I'd check for exhaust leaks. It sounds like the narrow band is picking up some O2 and the computer is adjusting for that...but it's driving the rest of the engine rich, as is evident from the WBO2. It could also be a faulty injector. Take a heat gun and measure the temp of each exhaust tube to see if they're all in the same range. Plugs, wires, and other ignition parts in good working order?

It seems like every time I have a problem like you're describing it ends up being a mechanical issue that I've overlooked.

Zach/90\irocZ

iTrader: (6)

already running one already


yes separate wide band and narrowband I have dual cat setup so narrowband is I left bank wideband in right


yea im in process of changing to Bosch 3 injectors been raining here
I have 24lb accels from previous owner been reading horror stories so just waiting till weather clears up

I tighten the exhaust all check out ok ill check the header flange next
everything was fine before but now its just off only thing I did before was increase fuel pressure and tighten intake bolts and replace spark plug wires because one was burn to core from header so possible one cylinder had weak spark possibly none which explain gradual increase in rough engine that gradually increase till I found the culprit


replace all spark plug wires and plugs dizzy is new all ignition checks out


as for driving there's no drivability issues pulls strong part throttle is strong
been seeing big gains from the tuning I've done so far as previous original drivability tune that was supposedly done on car before me was complete Crap
throttle response part throttle wot off line acceleration was just garbage literally stock thirdgen felt better and stronger then this built motor


besides at idle haven't started tuning that yet idle isn't steady it fluctuates 500 rpm in park some days it idles steady and little other minor idle issues that will be tuned

Zach/90\irocZ

iTrader: (6)

Changed injectors and wow major difference smoothness idle throttle response slight i
Acceels where complete garbage

I had engine shake cruising and accelerating which is gone smooth like butter God I hate a rough running engine lol

Air tuning on passenger was slightly loose I feel like a idiot lol

Decided to swap out egr also since was having idle issues since I was there threw the pain of removing injectors and intake old one was clog with carbon buildup which prob explain idle issues I was having and stalling but any ways everything back in line

Zach/90\irocZ

iTrader: (6)

Blm still off vs wideband I'm recalibrate wideband using lc1 by the way data just seems off

Wideband will read lean but blm will read rich below 128

Everything was fine till now I'm lost in the sauce lol

And it's throwing off my datalogs for ve tables just doesn't seem to be right after using spreadsheet ,haven't had no issues till now , laptop broke so transferred all files over to new computer and kinda when all this started so thinking issue is operator error with software
I look everything over mechanically nothing sticks out

Dominic Sorresso

You realize that 128 doesn't automatically mean stoich. The O2 voltage windows dictate that. Besides, when you are running C/L, other factors come into managing the fueling.
Also, what Inj. Bias were u using for the Accels?

Zach/90\irocZ

iTrader: (6)

Yes I under stand that

But for example the other day a lot of cells where lock at 108 for blm (due to that's the minimum blm set ).and int will be below 108 in 99 range but O2 voltage will be at 500mv and wideband says 16-17.3ish

Int/blm says it's pulling fuel but O2 says it's right on but wideband says lean so that's where I'm confused or that's normal I thought they all should trend together I don't care about setting it to exactly 128 due to what you said but anyways I go copy everything cause maybe I'm not picking and it skews the VE table up pretty bad due to this

Swap to Bosch 3 and I have uploaded tune data for it

Dominic Sorresso

Is the issue consistent throughout the fuel map or just at idle for example?

Zach/90\irocZ

iTrader: (6)

Seems through good part of table if not all of it have to double check when I get to the computer

RBob

iTrader: (1)

One thing that may have happened is that the NB O2 sensor got silicone poisoned. That will cause it to report rich, even to the point that the engine cuts out (BTDT).

Physically, there will be some white fluffy deposits on the O2 sensor.

The other item of course is how the engine runs. If it is stuttering and even cuts out then it is a possibility.

RBob.

Zach/90\irocZ

iTrader: (6)

Yes it does just cuts off when cold rpm just drops have to give gas but after couple min once engine fully warm it doesn't reoccurs and engine runs smooth and strong but there is times when it shutters and slight lose of power very very slight then it clears up kinda weird some times it happens sometime it doesn't but most noticeable during accelerating
I check it today

Zach/90\irocZ

iTrader: (6)

So changed it out did look kinda white but from O2 I've pulled before def doesn't look normal Imo tho

Zach/90\irocZ

iTrader: (6)

So these are my INT

Blm

Narrowband


Looks like int and narrowband are in line but blm just looks way off
Re calibrated my wide and and its more in line with int and narrowband

Zach/90\irocZ

iTrader: (6)

Long story short ignition troubles started to peak it's head that got worse and worse
New 02 sensor did help also as there was a difference in the datalogs comparing them before ignition troubles started to peak same time so hard to say how bad was O2 sensor

Coil pick up went bad or was on its way out getting weak spark from coil and coil was new

And ok replacement wires took a crap cracking at boot leaking spark out " 3rd set of wires" this time was 4 out of 8 wire boot crack less than couple weeks old last set 3 wires did same thing downgraded from 8mm since one got burnt on header so needed to replace and nobody locally had 1 wire I could buy and or better wires I wanted so have to order online and settle for over counter crappy wires
Have better ones on order coming in

After doing all of that engine was super rich now and subtracted 2 from entire table hand smooth a bit more and increase base timing to 9* car she seems to like it there and subtracted timing out main tables

Data log and added a little back into wot areas
But everything is back in order tuning strong sigh sure was frustrating week