[camcbride1987]

Ok a GM scanner. Can I get it directly from GM? Or would it be cheaper online somewhere?
So from what I understand of your scale of O2 Lambda to AFR
My O2's are working..
And the fact I changed the coils and injectors and there was no change in the miss fire of cyl 3 and 5.
I did get a P0017 DTC again. But I cleared it and the only DTC that came back now is P0300
Being that it's two adjacent cylinders could it be a head gasket problem? Or a timing chain slip?
And what about the pic I sent of crank sensor signal stating No?
I admit I'm not very save on these tools.
I can do A/C Heating and electrical but this stuff is kinda confusing.

 

[Team ZR-1]

Ok a GM scanner. Can I get it directly from GM? Or would it be cheaper online somewhere?
So from what I understand of your scale of O2 Lambda to AFR
My O2's are working..
And the fact I changed the coils and injectors and there was no change in the miss fire of cyl 3 and 5.
I did get a P0017 DTC again. But I cleared it and the only DTC that came back now is P0300
Being that it's two adjacent cylinders could it be a head gasket problem? Or a timing chain slip?
And what about the pic I sent of crank sensor signal stating No?
I admit I'm not very save on these tools.
I can do A/C Heating and electrical but this stuff is kinda confusing.

Little can be really seen on those damn screenprints to analyze good data

Again if having a laptop that uses MS Windows and has BLUETOOTH
If laptop does not have Bluetooth also on Amazon can buy cheap a USB dongle that has Bluetooth
This scanner below also comes with a cellphone APP for quick checking but laptop software also comes
with scanner and you can understand how much you could see on a laptop screen over that dinky ass handheld ( you should sell )
This scanner you could in scan or record mode do like 15 plus PIDs at the same time so easy to select all O2s, fuel trims, misfires, etc at same time and as I stated you can send others the recording, and they could replay or analyze your recorded data if recording was only 5 minutes of 3 hours drive recording

Here is $140 OBD2 scanner was written for use on GM vehicles sold on Amazon

OBDLINK MX+

https://www.amazon.com/OBDLink-Bluetooth-Professional-Grade-Diagnostic-Performance/dp/B07JFRFJG6?crid=1X5NR4RYPRP2&dib=eyJ2IjoiMSJ9.5dUKZZu22WICimkkoPKiTDK1g6pKwY3_JgzhCu1iTCSpjPkqY_l4cVQO3qKWDopFLnIt19qN17jgzTJ6SSjhPdWSD4TSPbPGaQSBBd02v7Oi2cBP7_U7IZJuHIMkpFVRoLBFPDPHxXWOxKXAMHT9JBtIP7cWNTJqDEHAgOLcW_MpYlxsIIaaXVAsDmqmZTaQcj_eoewgpRZBlo1UvRECKI0lEjfbTzDPbk8KIk8rVXo.8ugtWd_01j3gHJPmrNoyarcL3c-wgrceM6VZTjbnNLY&dib_tag=se&keywords=obdlink+mx%2B&qid=1758677664&sprefix=obdlink+mx%2Caps%2C166&sr=8-1

 

[Team ZR-1]

As example, using OBDLINK MX+
Recorded 15 PIDs (could have set up more than those) at the same time, and it does the math and tells during the recording what the min, mean and max values for each PID was
Also, how easy it is to read PIDs and values

See for the S1 O2s what the average (Mean) was in mVolts, yep around 14:7:1 AFR

 

[camcbride1987]

Ok well I have a laptop and wifi
I'll look into getting that GM scanner..
As far as my maf,map, injectors,barometric readings at idle
I sent pics of all that.
Do the map and maf look a bit high?
Looking at the specs on the scales of different components
Mine are much higher
I believe the map shows 58 Kpa
And maf at around 8
I've been watching YouTube on how to use this scan tool. Launch creader elite v2.0 How to get to all the functions.
I'll check more readings tomorrow
I'm still trying to do a CRK position relearn and will check and see why my cam sensors have to signal value! I sent a pic of that too.
What's strange is a little while back
I had a P0308 for cylinder 8 miss fire and I deleted the code and it never came back.
Now all of a sudden i have a miss fire on 3 and 5
I'm thinking on doing a smoke test on engine to see if any vacuum leaks.

 

[Team ZR-1]

Setting as to gauges so easy to see

 

[Team ZR-1]

Ok well I have a laptop and wifi
I'll look into getting that GM scanner..
As far as my maf,map, injectors,barometric readings at idle
I sent pics of all that.
Do the map and maf look a bit high?
Looking at the specs on the scales of different components
Mine are much higher
I believe the map shows 58 Kpa
And maf at around 8
I've been watching YouTube on how to use this scan tool. Launch creader elite v2.0 How to get to all the functions.
I'll check more readings tomorrow
I'm still trying to do a CRK position relearn and will check and see why my cam sensors have to signal value! I sent a pic of that too.
What's strange is a little while back
I had a P0308 for cylinder 8 miss fire and I deleted the code and it never came back.
Now all of a sudden i have a miss fire on 3 and 5
I'm thinking on doing a smoke test on engine to see if any vacuum leaks.

OBDLINK MX+ scanner is using Bluetooth, not WI-FI

I mentioned in other posts that IF at sea-level, MAP at idle when closed loop and A/C not on would be about 35-40 Kpa
IF weather is crappy like high heat and humidity, that would affect MAP a bit

IF MAP reading is high, MAP is inverse of Vacuum so higher MAP reading is meaning less Vac, means a leak
Find out what your elevation is and what weather heat index is

I mentioned in posts MAF at idle be around 1-2 lbs/min
IF CKP was not learned the PCM should be tripping a DTC for that, and I also posted that in another post

As I stated again, and your focus is why bank 2 is running so lean and again maybe only know if exhaust valve not fully closing
again we mentioned this in the past when CKP DTC was stating CAM sensor bank 2 exhaust issue

 

[camcbride1987]

Ok I did state I am at 4000 ft elevation and the weather here was 86°
I don't know if you saw the pic I sent today of map and maf? I'm sending it now.
Also I understand if crk position sensor wasn't learned the PCM would throw a code. I'm also sending pic of no crank signal request.

 

[Team ZR-1]

Showing a scanner recording of a vehicle I had worked on
It was around sealevel, has auto tranny and when parked/idle that uses fuel trim cell 16 (Park16)
Notice what MAP in Kpa was 36

GM uses for a N/A engine a 4 bar MAP sensor which max reading would be 104 KPA and that would be at WOT 100 % engine load at sea-level

The higher the elevation is the less air and density there is so engine could not get to 104 Kpa but lower, maybe like 95 Kpa . Add hot weather and the D/A gets even worse, could add another 2,000 to elevation

At 4,000 feet elevation means less vacuum so MAP at idle would be a bit higher than at sea-level
but your reading at idle is reporting 58 Kpa so that would be too high if you consider at your elevation at WOT 95 Kpa and you're already reporting 58 Kpa just for idle

I cannot say with your scanner if that crank PID is even correct or how they define what that PID really means but again of no DTC like you were getting weeks ago as to no CKP sync'd and not tripping no relearn been done then maybe the scanner crank PID is not valid ?

Look at Park16 fuel trim cell, see MAP is about 36 Kpa (65 KPA for Vacuum)

 

[camcbride1987]

So being my maf is 5.5 at idle 4000 elevation. Is ok?
But my map @ 58 kpa is too high.
Maybe I should get a new map?
And my scan tool saying crank signal request.. No is ok?

 

[camcbride1987]

I'm going to get a new map
Although I don't think it could be reason for the P0300 and the miss fire count on cyl 3 and 5 right?

 

[Team ZR-1]

I doubt it is the MAP sensor but what I stated multi times is some type of air or exhaust leak, more biased on bank 2

 

[camcbride1987]

So even an exhaust leak would cause a P0300? I didn't know that.
I am going to do the smoke text
I have a smoke machine and if I take the intake hose at valve cover and pour intake full of smoke? I should see if any leaks!
I'm just hoping after all I spend on this car and do to ii there isn't a leak.
At this point I'm leaning to a slip timing chain..
I hope not but with that P0017 code
.That worries me

 

[camcbride1987]

Ok I put two little cigars into intake via a hand siphon pump.
And no smoke came out anywhere
I checked on top the engine and below.
So if it had any leaks it would have shown itself.
Another thing..The guy I bought car from said he thinks the car has after market exhaust. As it's a little louder than normal.
I checked it's factory but when it's running I can hear what sounds like an exhaust leak and smell exhaust.
I checked after the Down stream O2's and no leaks.
My question is if there's a leak before O2's would that caus a rich condition on that bank? Fooling the O2's causing the PCM to call for more fuel?
Of balancing the whole system?

 

[Team ZR-1]

Yes, any outside air which is also cooler being sucked into any exhaust leak would change the makeup of the exhaust and be picked up by the O2.
Have no idea what smoker you're using but if not doing it with added pressure it cannot be pushed out small cracks such as welds or couplers
Proper use of smoker requires muffler tips to be plugged up like with rags and closing off front of throttlebody

Also, if the checkvalve for smog pump attached to exhaust manifold is stuck open would affect O2 readings

 

[camcbride1987]

You are right about the smoke test. It does need pressure. I was just using a syphon pump and a cigar. Not very effective. I think I'll use a shop vac using the exhaust on vac side with hose up pipe and seal it off. Get me some soap solution and see where it bubbles.
If I have an exhaust leak before O2
That would account for a lean condition on the bank that's leaking but not a rich condition on other bank..

 

[Team ZR-1]

Not sure how your smoker idea would work using soap suds

You can buy them from $50 to $100
Amazon

https://www.amazon.com/s?k=smoke+machine+automotive&crid=2K4FT28LDXZCO&sprefix=Smoke+Machine%2Caps%2C163&ref=nb_sb_ss_ab-ac-rank-f5_1_13

They also sell products that are like oil to use with smoker
Or I use auto tranny fluid as it stinks so if I cannot see a small smoke leak I can first smell it and follow that to the leak

Or I have in the past when needed, made one

 

[camcbride1987]

I saw it on YouTube. I'll look into the smoke machine. Thing is I don't really understand why if there is a leak before O2's I don't hear it up in engine bay ticking?
I really don't think a vacuum leak is it?
Like I said.It would account for a lean condition but not rich.
All injectors are working as they should. I listened to each one with my automotive stethoscope
And all ticking the same.
I installed the 2 hole injectors just like what was on there.
If you think I should do the real smoke test I'll buy a smoke machine and do the test?
Right now I'm in for a penny so may as well be in for a pound how ever that saying goes?
Now just wondering if you think it could be a timing chain slip at this point? Maybe slightly slip?
I'm just not understanding the 3 and 5 cyl miss fire count being 29 and 40?
That pretty much seems like a head gasket.
I think I'm going to do a compression test just because I can. Hopefully eliminate that scenario. It will also tell me if a valve is hanging slightly open. Maybe a dry and wet test.

 

[camcbride1987]

Tomorrow I check fuel pressure again and the compression test
Last time I checked fuel pressure at rail it was 60 psi and dropped to 50 when running.
I found a smoke machine with its own compressor and comes with 2 bottles of oil

 

[camcbride1987]

Update: upon inspecting the PCM wires again I noticed a wire was spliced into one of the plug harnesses. It was crimped not soldered with a 14 gauge wire bigger than the original wire. I found it going to the bank 1 exhaust cam sensor.
The original wire is still there up top.ans below.
Could this account for the problem P0017 code and miss fire,?

 

[Team ZR-1]

Would have been better if you posted a photo of those spliced wires from the PCM wiring loom connector

Yes could be the problem with P0017 DTC and shows this problem has existed for some time, and they tried fixing that

But also misfires clearly can be because bad charge to cylinders with those high lean AFR on bank 2