[jared21927]

I got a Drivetrain warning on my way home Saturday a few miles from home. Ran the code on the Torque app and it was a misfire in cylinder 2. Checked it out and the coil was trashed. It was melted hard and there was a bit of fuel and oil in the cylinder. Replaced all 4 coils, still a misfire. Changed the plugs, still a misfire. Changed the injector on cylinder 2, still a misfire. The misfire is only on cylinder 2. After going through what i thought would have been standard procedures to diagnose, i'm still at a loss. I cant see any visible leaks and everything is tight and connected properly. What am i missing/overlooking here? Thoughts?

[Billfitz]

Did you clear the code and it came back?

[jared21927]

Originally Posted by Billfitz

Did you clear the code and it came back?

yup, via torque. wondering if it has to do with the app im using.....

[Billfitz]

It may not be specific enough in its diagnostic capabilities.

[AtlantaDan]

Get the car scanned by the shop, or get a real scaner and use ISTA / Rhinegold to see what is really going on. Can you feel the misfire or is it just the app telling you there is one? If you can actually feel it, thats a horse of another color. If you can't, I would suspect that Torque can't really see what the code is all about.

If the miss is real, and given what you have already replaced, your next step is to run a compression and leakdown test. If it passes that, it's an electronic issue. If it doesn't....well.....

[thakid22]

Originally Posted by jared21927

I got a Drivetrain warning on my way home Saturday a few miles from home. Ran the code on the Torque app and it was a misfire in cylinder 2. Checked it out and the coil was trashed. It was melted hard and there was a bit of fuel and oil in the cylinder. Replaced all 4 coils, still a misfire. Changed the plugs, still a misfire. Changed the injector on cylinder 2, still a misfire. The misfire is only on cylinder 2. After going through what i thought would have been standard procedures to diagnose, i'm still at a loss. I cant see any visible leaks and everything is tight and connected properly. What am i missing/overlooking here? Thoughts?

Did you code the injector that you replaced?

Without coding the ECU with the values printed on the front of the replacement injector, it won't perform properly. You cannot do this with The Torque App.
You need Rheingold, or other BMW solutions. A dealer or indie can do this for you too, for a fee.

Even if this is not causing your issue, you should go back and code that injector.

[pshovest]

N20 engine uses EU5 or EU6 injectors, no coding is required. These are solenoid type injectors. It's the piezoelectric injectors from N54 and other early DI engines that need coding.
Check the spark plug color. I had a cyl 1 misfire on my N54, but cyl 3 was running very rich making plug very dark compared to the others. I ended up replacing cyl 3 injector to make cyl 1 misfire go away.

[jared21927]

Taking it to an indy shop tomorrow to have a look. I definitely still feel the misfire and i still have the code and drivetrain warning. Torque is a good basic app but for this i need something more suitable like Foxwell, which i don't want to throw money at. I'll let the experts figure it out

I read about that injector coding and i was told it wasn't needed for EU6 injectors as stated above. I don't have the software to do it anyway, but i did write down the relevant flow rate number if they say i need that. I'll see what the shop says and report back tomorrow.

[floridaorange]

Hope its a simple injector issue - how's it driving? Just limp mode?

[jared21927]

Originally Posted by floridaorange

Hope its a simple injector issue - how's it driving? Just limp mode?

Driving okay minus the loss of full power. Rough idle but otherwise you don't notice it until you really try to push it and it doesn't accelerate quickly.

[pshovest]

What's the build date of your car? EU5 and EU6 injectors are not interchangeable. If shop installed an EU6 and the other injectors are EU5's you've got a problem. Pull the beauty cover and use phone to take a pic of each injector and compare part numbers. The BMW procedure is to interrogate the car with scanner to determine which injector you have. You can't go by built date to determine which injector you have, however a 2012 build date almost certainly has EU5 injectors.

[thakid22]

Originally Posted by jared21927

Taking it to an indy shop tomorrow to have a look. I definitely still feel the misfire and i still have the code and drivetrain warning. Torque is a good basic app but for this i need something more suitable like Foxwell, which i don't want to throw money at. I'll let the experts figure it out

I read about that injector coding and i was told it wasn't needed for EU6 injectors as stated above. I don't have the software to do it anyway, but i did write down the relevant flow rate number if they say i need that. I'll see what the shop says and report back tomorrow.

I was thinking you had the N54. You are correct, coding not necessary with the EU6 injectors.

[jared21927]

Originally Posted by pshovest

What's the build date of your car? EU5 and EU6 injectors are not interchangeable. If shop installed an EU6 and the other injectors are EU5's you've got a problem. Pull the beauty cover and use phone to take a pic of each injector and compare part numbers. The BMW procedure is to interrogate the car with scanner to determine which injector you have. You can't go by built date to determine which injector you have, however a 2012 build date almost certainly has EU5 injectors.

Build date is 2/2013. No idea if the previous installed injectors were EU5, but the replacement was an EU6. Guess I'll find out tomorrow. Thanks for everyone's input.

[eluded]

Hope it's good news. One time I ruled out coils, spark plug, plug wires, fuel injector… Had the same issue.

The next day I spoke at motor number one's funeral. It was a good motor. We had been through a lot together. Mostly good times in the upper rev range. I'll miss her. The Funeral was expensive. Very expensive.

[floridaorange]

Me too ^

[jared21927]

Originally Posted by eluded

Hope it's good news. One time I ruled out coils, spark plug, plug wires, fuel injector… Had the same issue.

The next day I spoke at motor number one's funeral. It was a good motor. We had been through a lot together. Mostly good times in the upper rev range. I'll miss her. The Funeral was expensive. Very expensive.

RIP

[jared21927]

Quick update. Been at the shop a couple hours. They cant figure it out. They've moved coils, plugs, switched injectors, etc. Still that misfire on cylinder 2. They have to call BMW to go through some testing procedures as it may be a bad harness. DME is good, sending signal and the injector was coded correctly yet the misfire still exists. Glad to know i wasn't crazy.

Gotta leave the car here maybe over the weekend. More to come......

[AtlantaDan]

No mention of a compression test...

[jared21927]

Originally Posted by AtlantaDan

No mention of a compression test...

My guess is this is a part of those BMW testing procedures they spoke of. We'll see

[Billfitz]

Once fuel and ignition have been ruled out the next most likely culprit is valves, then the camshaft.

[Fr3sh]

Going to the same thing

[eluded]

Originally Posted by jared21927

Quick update. Been at the shop a couple hours. They cant figure it out. They've moved coils, plugs, switched injectors, etc. Still that misfire on cylinder 2. They have to call BMW to go through some testing procedures as it may be a bad harness. DME is good, sending signal and the injector was coded correctly yet the misfire still exists. Glad to know i wasn't crazy.

Gotta leave the car here maybe over the weekend. More to come......

Any update ?