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2006 STS 4.6 with O2 codes

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Discussion starter · #193 · (Edited)
Did things just get worse?
No crank sensor signal,no cam sensor signal, still same fuel trims
Misfire on 3 and 5 cylinders
This is insane!! I'm going to switch cylinders 3 and 5 could and fuel injectors and see if it changes?
I'm going to turn ignition on and check the 5v reference to each cam sensor.
I don't know why it says no signal from crk sensor?
This car is driving me batty!
 
#196 ·
Problem is with about 200 posts for this thread is your not learning much and that POC scanner

Not sure why only those couple of screenprints would give the answers because it cannot
but look at the 2 S1 O2 you only show about 1 second of engine run time and show only as Lambda

Then compare the conversion chart, does it look normal and about correct just for idle ?

Image



YOUR scanner screenprints :
Image
 
Discussion starter · #197 · (Edited)
I let graph go for a full minute.
You said you wanted lambda
So that's why I graphed it
Before I was getting basically flat line with both B1 and b2 sensor 1's
As you can see in the miss fire count cylinder 3 has 29 and 5 has from 49 to 90
But I'm not getting a P0303 or P0305 code just a P0300 multiple random miss fire..
I switched both 5 and 3 cylinders with coils with 4 and 6
No change
Also switched the injectors.
No change.
Everything is in metric now
So what is it you want to see? I'll
Put it on the scan tool and take a pic as I can't do videos on here for some reason.
Ok so you want to see b2S1 graph longer?
So I need to see Air fuel ratio of 14.7 to 1
I'll redo these and send MV and lambda readings
 
#199 ·
camcbride1987 said:
I let graph go for a full minute.
You said you wanted lambda
So that's why I graphed it
Before I was getting basically flat line with both B1 and b2 sensor 1's
As you can see in the miss fire count cylinder 3 has 29 and 5 has from 49 to 90
But I'm not getting a P0303 or P0305 code just a P0300 multiple random miss fire..
I switched both 5 and 3 cylinders with coils with 4 and 6
No change
Also switched the injectors.
No change.
Everything is in metric now
So what is it you want to see? I'll
Put it on the scan tool and take a pic as I can't do videos on here for some reason.
Ok so you want to see b2S1 graph longer?
So I need to see Air fuel ratio of 14.7 to 1
I'll redo these and send MV and lambda readings
Click to expand...

That is the problem with using handheld scanners they are limited in what they do and how they do it
A 1 minute screenprint is really not useful as the scanner has a slow capture rate so in 1 minute very little data is captured
I stated weeks ago for serious OBD2 debugging you need like a $140 GM scanner that works on a laptop that has MS windows
and allows much more functions, long recording drives, full replays and can be sent to other people to analyze

If scanning O2s as to Lambda, and it is flatlined lets say around 1.0 as charts I have posted means the AFR is perfect and correct 14.7:1 AFR

Rather, was scanning O2s but instead the mVolts PIDs the chart lines would be moving up and down

I stated weeks ago, not all GM vehicles did GM support each cylinder's misfire counters and if so the only DTC that would be shown would be P0300

You need to go back to posts I did that showed tables as Lambda to AFR conversions and as I stated several times
if at idle in closed loop and all was well the average O2 mVolts would be about 0.500
 
#200 · (Edited)
I could spend countless hours of labor in trying to take each of the photos and analyze each, do not have that amount of time

I will add my info between each screenprint below in RED if possible, but you have no spaces between images for me to do that

Lambda of 0.998 is about perfect 14.7:1 AFR so that is good for Bank 1

O2 B1S1 reported 0.458 mVolts = right around 14.7:1 AFR which is good
B2S1 shows Lambda of 1.287, use the table I posed to convert to AFR which is 19.0:1
so bank 2 is way lean where Bank1 shows good

All other screenprints showing Bank 2 is reporting way fricking LEAN so focus on that head
and by now you should be able to see the values scanners report and know what the AFR or Lambda values mean

The fact with all new O2s and Bank2 is still way lean clearly shows something wrong for that head
I also stated in past posts if you took the valve cover off and see if seeing any valvetrain issues causing an exhaust valve not fully closing

Could if need be some rags around head, with cover off if possible to idle and watch rockers and valves to see if all is working correctly
or some exhaust leak from head would pull in outside air and O2 sees that and reports AFR incorrectly, causing PCM to incorrectly command fuel injectors

View attachment 687896
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View attachment 687890
I hope this is what you want to see?
I took pics of graphs for B1S1 and B2S1
Also heater command
I hope this tells you what you need to know
[/QUOTE]
 
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camcbride1987
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