Cylinder 2 Misfire help N62B44

[andrewwynn]

ECU under the hood. When I first got my first x5, i had random errors that m were cleared up when i cleaned and treated the 4-5 connectors to the DME.

Deoxit pro gold can't be beat.

[Fatcat]

haven't tried cleaning the ECU but I did a compression test all of the cylinders passenger side were about 120 Psi, opened the valve cover and checked the springs and everything looked good too, what could be next? also the idle misfire has gotten really bad the whole car shakes. I doubt it's the fuel injectors but I might have to check those next

[BimmerBreaker]

The DME is not under the dash.


Have you checked the eccentric cam gears? If the valve covers were off it should be easy to check those. Excessive wear on those can cause problems similar to what you are describing.

[Fatcat]

Originally Posted by BimmerBreaker

The DME is not under the dash.


Have you checked the eccentric cam gears? If the valve covers were off it should be easy to check those. Excessive wear on those can cause problems similar to what you are describing.

I don't remember checking the eccentric cam gears but they should probably be fine because my dad and i looked around pretty good and the engine has been slightly "rebuilt", I honestly don't want to open up the valve cover again because it was a complete pain in the ass for me however we only checked one side. could there be any simpler problems to troubleshoot?

[80stech]

I haven't done much with valvetronic but if the mis is only at idle I think wear in the valvetronic linkage is highly suspect. Maybe try bumping up the idle speed.

[BimmerBreaker]

Idle speed can not easily be adjusted.


To check the eccentric cam gears you only need to remove the valvetronic motors. I would check both sides since you only removed one valve cover before. You can't say the engine is healthy if you only checked one bank.

Saying the engine has been slightly "rebuilt" is actually cause for concern for me, to be honest. Most people don't know how to rebuilt the N62 correctly. I would

[Henn28]

Originally Posted by Fatcat

DME connector is the port where the OBD scanner goes in right? or is it a part of the ECU?

It’s the big plug/connection where the engine wiring harness plugs into the DME in the box that’s in the cowl section of your car, right side, up by the windshield. Disconnect the battery, take the cover off, find the DME and pull that plug off. Inspect the DME and plug for corrosion, bent pins/tabs, water intrusion, etc.

In the spirit of doing the easy stuff before the hard and expensive stuff, You may want to check all your grounds. Especially the ones under the coil covers. Though the fact that your OBD port isn’t working seems to point to the DME perhaps…at least in my one brain cell. Can you access other modules, like the transmission module?

My single cylinder misfire turned out to be water intrusion into the actual harness during a coolant pipe job I did.

[Fatcat]

Alright imma take your advice probably around Thanksgiving break I can focus on my car.

Does anyone know why it's usually whenever the car is cold? for example, it only happens in drive from what I've experienced usually when you gas it a little bit but not suddenly. I try to replicate it in Park but no misfire, but in Drive, if the car does not warm up for a good minute or two (by that I mean past the cold start cycle, I hold revs at 1k then 2k then 3k then 4k till my coolant is close to the middle) it'll give me the error. I usually just drive with my OBD2 connected and delete it till it goes away. once my car is warm and the code has been cleared once or twice it runs great and pulls through traffic with no problem until I come to a stop and idle then I meet another misfire which literally moves the whole car (I think this is a completely different misfire)

I'm going to look for my old ECU hopefully I can find it so wish me luck.

[Fatcat]

Originally Posted by BimmerBreaker

Idle speed can not easily be adjusted.


To check the eccentric cam gears you only need to remove the valvetronic motors. I would check both sides since you only removed one valve cover before. You can't say the engine is healthy if you only checked one bank.

Saying the engine has been slightly "rebuilt" is actually cause for concern for me, to be honest. Most people don't know how to rebuilt the N62 correctly. I would

can you explain more on "Most people don't know how to rebuild the N62 correctly"?

the guy who rebuilt it pointed at multiple "problems" till we found out something in the valvetrain went wrong (I forgot what, it was a spring or something) he even made us change our ECU which was not needed from what I know.

[Fatcat]

Originally Posted by Henn28

It’s the big plug/connection where the engine wiring harness plugs into the DME in the box that’s in the cowl section of your car, right side, up by the windshield. Disconnect the battery, take the cover off, find the DME and pull that plug off. Inspect the DME and plug for corrosion, bent pins/tabs, water intrusion, etc.

In the spirit of doing the easy stuff before the hard and expensive stuff, You may want to check all your grounds. Especially the ones under the coil covers. Though the fact that your OBD port isn’t working seems to point to the DME perhaps…at least in my one brain cell. Can you access other modules, like the transmission module?

My single cylinder misfire turned out to be water intrusion into the actual harness during a coolant pipe job I did.

I'm sure I can access my TCM easily but what could it have to do with my case?