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      01-22-2025, 12:49 AM   #1
Mohama
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Miss fire issues.

Hello all I have 11 comp e92 m3 that I'm rebuilding.

Currently I have missfire on cylinder 8 6 7

Things I have done so far

New plugs
New fuel injectors
Used coils that are working

New altenator because I had voltage under 14 volts and still do.
Brand new battery safety termial and the red portion that clips the the battery
New accuators.
New battery.


I have swapped the coils from bank 1 to bank 2 and the missfires don't move
When I clear codes and restart car it runs fine than missfires on 8 and after a bit 6 7 8 come on the code reader.

Any ideas on what to do and check? I'm all out of ideas and forums to read through. Also anything to check to figure out why my voltage even when the car is on why it does not show over 14 volts?
I posted a picture of the codes i got. The other codes seen are because I have no headliner in the car currently.

If anyone can point me in the right direction to check please let me know.
Also is there any fuses I should be checking? Grounds? Etc.

Thank you for reading.
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      01-22-2025, 12:47 PM   #2
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What are the exact spark plugs you used?
What are the exact coils you used? Are these OEM?
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      01-22-2025, 12:49 PM   #3
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Ngk lrp
Oem coils bmw marked ones u got used when I swap them around it doesn't do anything
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      01-22-2025, 02:05 PM   #4
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Quote:
Originally Posted by Mohama View Post
Ngk lrp
Oem coils bmw marked ones u got used when I swap them around it doesn't do anything
Whats the full P/N of the spark plug?
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      01-22-2025, 02:34 PM   #5
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Lkr8ap ngk
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      01-22-2025, 02:34 PM   #6
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Quote:
Originally Posted by RocketyMan View Post
Whats the full P/N of the spark plug?
Lkr8ap got them from fcp
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      01-22-2025, 02:47 PM   #7
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All codes for reference in ista+.

Lot of the codes are because headliner not in and no light on in the front either.
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      01-22-2025, 03:01 PM   #8
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Great! You got ISTA.

There is a misfire service routine that graphs all of the misfire info very easily.

Can you post a screenshot of it running and the graph?
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      01-22-2025, 03:13 PM   #9
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Quote:
Originally Posted by RocketyMan View Post
Great! You got ISTA.

There is a misfire service routine that graphs all of the misfire info very easily.

Can you post a screenshot of it running and the graph?
How do i get to that service part on ista?? Right now I'm going to charge the battery so I know i have no other issues electrical. Onlything I have to check still is the ground. And I also ordered 2 o2 sensors to change.
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      01-22-2025, 03:28 PM   #10
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The search function isn't great on this forum.

So try reading up on here as I've dealt with this before myself.
https://www.m3post.com/forums/showthread.php?t=1971038

It might also be worth checking the gap on the plugs...maybe? You need to do this with a wire-gauge. Gap should be .032" to .036" and I aim for the lower end.

There is a ground on the valve cover stud/bolt. Perhaps that might be contributing. I'm not confident your Lambda sensors would contribute--but worth looking at to make sure they're "logical" in reporting. You can always swap these left to right as well.
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      01-23-2025, 08:20 AM   #11
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Quote:
Originally Posted by RocketyMan View Post
The search function isn't great on this forum.

So try reading up on here as I've dealt with this before myself.
https://www.m3post.com/forums/showthread.php?t=1971038

It might also be worth checking the gap on the plugs...maybe? You need to do this with a wire-gauge. Gap should be .032" to .036" and I aim for the lower end.

There is a ground on the valve cover stud/bolt. Perhaps that might be contributing. I'm not confident your Lambda sensors would contribute--but worth looking at to make sure they're "logical" in reporting. You can always swap these left to right as well.
I checked that ground. It was loose at one point and I did tighten it. But still had a constant miss on cylinder 8. Now it's 6 7 8. When I clear codes the car runs fine and after a bit 6 7 start to miss. Also the gap on the plugs are pregapped never touched them. And I will get that screenshot from ista this Monday. Any other reason why swapping a coil doesn't yield my problem? I ordered o2 sensors also.
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      01-23-2025, 10:39 AM   #12
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I also had an issue where the car shows low battery so I take it to autzone to charge and it was fully charged. So I think I have an electrical issue I need to figure out which also confirms with my voltage on the car never showing about 14 volts when the car is on. What can i check to figure this out?
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      01-23-2025, 10:51 AM   #13
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Quote:
Originally Posted by RocketyMan View Post
Great! You got ISTA.

There is a misfire service routine that graphs all of the misfire info very easily.

Can you post a screenshot of it running and the graph?
Here is the data also this is from Dec 24 will get a updated one Monday.
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      01-23-2025, 02:25 PM   #14
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Quote:
Originally Posted by Mohama View Post
Here is the data also this is from Dec 24 will get a updated one Monday.
Okay. This needs to be done on a cold start, and graphing data as soon as the engine starts to have meaningful data here.

Otherwise, I can just verify that bank 2 is all deactivated.

--

Any update on checking the ground on the valve cover? It might be worth taking it off and cleaning it and re-fastening. Torque should be roughly 10Nm.
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      01-23-2025, 03:33 PM   #15
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Two attachment points on that side if I recall correctly
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      01-24-2025, 11:03 PM   #16
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Quote:
Originally Posted by RocketyMan View Post
Okay. This needs to be done on a cold start, and graphing data as soon as the engine starts to have meaningful data here.

Otherwise, I can just verify that bank 2 is all deactivated.

--

Any update on checking the ground on the valve cover? It might be worth taking it off and cleaning it and re-fastening. Torque should be roughly 10Nm.
Ok I changed the ground wire under the car. It fixed my voltage over 14. But still missfires on 8 and 6 7. I also unplugged the ignition coil while the car was on cylinder 8 and no change. So monday I will check the ground wire on valve cover. Is there a diagram for it to where it connects to?

I have o2s on the way will be installed Monday as well. Anything else i should check?
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      01-25-2025, 12:09 AM   #17
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Interesting. I'm not too sure where that wire you have in your hand came from as it's not looking familiar to me.

There is a capacitor that helps with interference. It is possible you have a broken one causing these issues. But I doubt it since bank 1 is operating fine and the capacitors are in parallel.

Do you have any details as to when this started happening? Was it all of a sudden? Did you make a change to something?
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      01-25-2025, 12:20 AM   #18
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Quote:
Originally Posted by RocketyMan View Post
Interesting. I'm not too sure where that wire you have in your hand came from as it's not looking familiar to me.

There is a capacitor that helps with interference. It is possible you have a broken one causing these issues. But I doubt it since bank 1 is operating fine and the capacitors are in parallel.

Do you have any details as to when this started happening? Was it all of a sudden? Did you make a change to something?
The ground wire was from the engine on the passenger side..
It was misfiring when I got it.

I have new injectors plugs accuators and used coils. Where can I find that capacitor? Ima try to swap coils now to see if the codes will move than that will narrow it down to the coils which would be an easy fix. Also the ground helped me get my voltage above 14v when it is on. Now only codes is missfires and the dsc codes which I haven't looked into yet.


I'm thinking it could be the actual wiring for the coils? Or mabey like you said to check the valve cover ground. And i will compression test the car Monday. Is there a special procedure I can use with ista? Or just unplug coils and plugs on the whole engine and unplug the fuel pump fuse?
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      01-25-2025, 12:08 PM   #19
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Quote:
Originally Posted by Mohama View Post
The ground wire was from the engine on the passenger side..
It was misfiring when I got it.

I have new injectors plugs accuators and used coils. Where can I find that capacitor? Ima try to swap coils now to see if the codes will move than that will narrow it down to the coils which would be an easy fix. Also the ground helped me get my voltage above 14v when it is on. Now only codes is missfires and the dsc codes which I haven't looked into yet.


I'm thinking it could be the actual wiring for the coils? Or mabey like you said to check the valve cover ground. And i will compression test the car Monday. Is there a special procedure I can use with ista? Or just unplug coils and plugs on the whole engine and unplug the fuel pump fuse?
I think I like your other ideas to check first, like a compression test. You can disconnect the crank sensor located by the flywheel to prevent the car starting as you do compression test. Or you can also do fuel pump as well. You should get around 180 PSI and hopefully everything within 10%.

Do you have access to a bore-scope? Might be worth doing too if you get low comp. But I still lean on something electrical. If you swap coils, do it left to right. And when you start the car, verify on a cold start on that ISTA page first.
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      01-26-2025, 04:23 PM   #20
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Quote:
Originally Posted by RocketyMan View Post
I think I like your other ideas to check first, like a compression test. You can disconnect the crank sensor located by the flywheel to prevent the car starting as you do compression test. Or you can also do fuel pump as well. You should get around 180 PSI and hopefully everything within 10%.

Do you have access to a bore-scope? Might be worth doing too if you get low comp. But I still lean on something electrical. If you swap coils, do it left to right. And when you start the car, verify on a cold start on that ISTA page first.
What do you mean verify before cold start? Do you mean check the misfire detection on cold start?
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      01-26-2025, 10:59 PM   #21
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Quote:
Originally Posted by Mohama View Post
What do you mean verify before cold start? Do you mean check the misfire detection on cold start?
Yes. Maybe I wasn't clear on that exactly. But basically have ISTA open and running the misfire panel and start the car with plotting data.
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      01-29-2025, 01:18 AM   #22
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Quote:
Originally Posted by RocketyMan View Post
Yes. Maybe I wasn't clear on that exactly. But basically have ISTA open and running the misfire panel and start the car with plotting data.
Attempted to get the o2 off today failed going to try a torch and some pb blaster and try again tommorow hopefully it's the issue. Also the gaskets on the downpipe looked fine no cracks. I attached the graphs. Below on the cold start. I'm assuming one of the graphs which is bank 2 o2 aren't reading throwing the car into limp? And both side o2 are insanely stuck.
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