[MacE90]

Originally Posted by KF335i

We can try again but I can assure you we have triple and quadruple checked coils/plugs. Is it possible that its a bad coil? I mean the car ran immaculately before the JB4 install but maybe in the movement of things it triggered a problem?

I would look in to the exhaust gas flap being disconnected as that is what code 2E4C describes. The best test for a bad coil is to move it to a different location and see if the misfire follows. Will you attach the .csv file please. I know this forum prefers datazap but the .csv file has a lot of information regarding your settings.

Edit: I would still check to make sure your plugs are torqued to spec and not finger tight.

[KF335i]

Originally Posted by MacE90

I would look in to the exhaust gas flap being disconnected as that is what code 2E4C describes. The best test for a bad coil is to move it to a different location and see if the misfire follows. Will you attach the .csv file please. I know this forum prefers datazap but the .csv file has a lot of information regarding your settings.

Edit: I would still check to make sure your plugs are torqued to spec and not finger tight.

Do you know what the torque specs are? Looks like you drive the same car. How do I attach the csv file to this thread?

[KF335i]

Originally Posted by MacE90

I would look in to the exhaust gas flap being disconnected as that is what code 2E4C describes. The best test for a bad coil is to move it to a different location and see if the misfire follows. Will you attach the .csv file please. I know this forum prefers datazap but the .csv file has a lot of information regarding your settings.

Edit: I would still check to make sure your plugs are torqued to spec and not finger tight.

Checked the plugs and they are properly torqued so maybe I will go pick up a coil from BMW and swap it out with #5 and maybe that helps?

[hibye19013]

When I was still running the JB4, I changed the spark plugs and the same exact thing happened to me. New coils was the solution to my problem and I replaced them all. Amazon had the best price for the delphi coils if you can wait.

[MacE90]

Originally Posted by KF335i

Checked the plugs and they are properly torqued so maybe I will go pick up a coil from BMW and swap it out with #5 and maybe that helps?

Just swap the coil on #5 with a different cylinder. If the misfire follows to the new cylinder then you know it is a bad coil.

[MacE90]

Originally Posted by KF335i

Do you know what the torque specs are? Looks like you drive the same car. How do I attach the csv file to this thread?

To attach a file:

Click Go advanced -> manage attachments -> browse file to upload

[KF335i]

Originally Posted by MacE90

To attach a file:

Click Go advanced -> manage attachments -> browse file to upload

It keeps saying invalid file?

[KF335i]

Originally Posted by MacE90

Just swap the coil on #5 with a different cylinder. If the misfire follows to the new cylinder then you know it is a bad coil.

The thing is the misfire code only shows when the engine goes into limp mode and the cel comes on. Not when it is just idling. Not sure if there is anything to that and its maybe a false positive?

[KF335i]

Originally Posted by hibye19013

When I was still running the JB4, I changed the spark plugs and the same exact thing happened to me. New coils was the solution to my problem and I replaced them all. Amazon had the best price for the delphi coils if you can wait.

Hey thanks for the response, kind of sucks if thats the case as the car was running perfectly before and the kilometres arent exactly high.

[MacE90]

Originally Posted by KF335i

It keeps saying invalid file?

Oh, e90post. PM me your email

[KF335i]

Originally Posted by MacE90

Oh, e90post. PM me your email

So I just got back from BMW with a new coil ($150 CDN as lordco cant get them in until tomorrow) and am still having the same problem :/ No engine lights are coming on in the car.

[KF335i]

Just an update if anyone cares... took it to a local shop today ($150) and was told it was a major vacuum leak due to a cracked valve cover as a result of the car being over boosted by the tuner.

[Cory S]

Originally Posted by KF335i

Just an update if anyone cares... took it to a local shop today ($150) and was told it was a major vacuum leak due to a cracked valve cover as a result of the car being over boosted by the tuner.

This really doesn't/can't happen.

[KF335i]

Originally Posted by Cory S

This really doesn't/can't happen.

Can you explain why it cant happen?

[Cory S]

Originally Posted by KF335i

Can you explain why it cant happen?

The valve/cam cover doesn't hold charge pressure.

[KF335i]

Originally Posted by Cory S

The valve/cam cover doesn't hold charge pressure.

So this is what they said in their diagnostic report, they didnt try and sell me on the job and told me to take it to BMW as they knew I was under warranty:

Test drive with equipment connected to experience problem and population error data. Found codes 387f set for power management close circuit current violation, 2e4c set for exhaust gas flap and 321d set for small evap system leak. TEst to find that problem appears to be mechanical & not electrical. Found fuel trim at normal around +-2% however when oil fill cap removed fuel trims dropped to -20% indicating a large internal vacuum leak. It is not uncommon for theses vehicles to have failed valve covers that cause a large vacuum leak inside engine.

[Mike@N54Tuning.com]

I think you should change the subject of your post to "misfires after swapping plugs and coils" since the JB4 isn't even on the car. Leaking valve cover gaskets / covers are pretty common. Can't be related to JB4 as it would not have any affect on valve cover.

You may want to find another shop

Mike

[KF335i]

Originally Posted by Mike@N54Tuning.com

I think you should change the subject of your post to "misfires after swapping plugs and coils" since the JB4 isn't even on the car. Leaking valve cover gaskets / covers are pretty common. Can't be related to JB4 as it would not have any affect on valve cover.

You may want to find another shop

Mike

Mike the car ran immaculately before the JB4 install... spark plug installation is incredibly basic and was not poorly done... we even put the original plugs back in and we still had the sames issues. Why is it that the JB4 seems to be this infallible product that can do no wrong here? Why isnt it plausible that the unit malfunctioned and overboosted the car causing a vacuum leak?

Haven't been overly impressed with the customer service either as I was basically told to get stuffed and go see a mechanic. The advice from Terry & you has basically been some parameter adjustments in the JB4 software which if you had listened to what I said were no longer important as the car now does not run properly with the jb4 removed. I've received zero tangible mechanical advice at all.

If replacing the spark plugs caused all of this, please tell me why.. I only swapped one coil.

[Mike@N54Tuning.com]

Originally Posted by Cory S

The valve/cam cover doesn't hold charge pressure.

+1

Mike

[Mike@N54Tuning.com]

Originally Posted by KF335i

So this is what they said in their diagnostic report, they didnt try and sell me on the job and told me to take it to BMW as they knew I was under warranty:

Test drive with equipment connected to experience problem and population error data. Found codes 387f set for power management close circuit current violation, 2e4c set for exhaust gas flap and 321d set for small evap system leak. TEst to find that problem appears to be mechanical & not electrical. Found fuel trim at normal around +-2% however when oil fill cap removed fuel trims dropped to -20% indicating a large internal vacuum leak. It is not uncommon for theses vehicles to have failed valve covers that cause a large vacuum leak inside engine.

If you are under warranty then its pretty simple job to get the valve cover replaced. Car should be good as new after that. When they are in there make sure they check the other vacuum lines, etc. to ensure everything else is good.

Mike