MHD Logs

[Raw422]

Can anyone please look at my logs, I feel that there may be some issues. The idle bounces when coming to a stop and I feel there may be a boost leak but I'm unsure. Any help or insight would be appreciated

https://datazap.me/u/raw422/log-1683...og=0&data=4-20

https://datazap.me/u/raw422/log-1683...og=0&data=4-20

I am FBO running stage 2+ 93 octane

I have new coils and colder plugs, and just replaced a fuel injector that went bad

Edit: Some new logs
https://datazap.me/u/raw422/log-1683...og=0&data=4-20

https://datazap.me/u/raw422/log-1683...og=0&data=4-20

https://datazap.me/u/raw422/log-1683...og=0&data=4-20

[PRTSB1M]

Originally Posted by Raw422

Can anyone please look at my logs, I feel that there may be some issues. The idle bounces when coming to a stop and I feel there may be a boost leak but I'm unsure. Any help or insight would be appreciated

https://datazap.me/u/raw422/log-1683...og=0&data=4-20

https://datazap.me/u/raw422/log-1683...og=0&data=4-20

I am FBO running stage 2+ 93 octane

I have new coils and colder plugs, and just replaced a fuel injector that went bad

Edit: Some new logs
https://datazap.me/u/raw422/log-1683...og=0&data=4-20

https://datazap.me/u/raw422/log-1683...og=0&data=4-20

https://datazap.me/u/raw422/log-1683...og=0&data=4-20

What codes are being thrown by the ECU?

[Raw422]

There was a lean code but never came back. Just fixed a vacuum leak that took care of the bouncing at idle. I still feel like I am low boost. Here are some logs from this morning

https://datazap.me/u/raw422/log-1683...og=0&data=4-20

https://datazap.me/u/raw422/log-1683...og=0&data=4-20

https://datazap.me/u/raw422/log-1683...og=0&data=4-20

I am trying to learn as much as I can but still pretty new to this, I appreciate the help.

[PRTSB1M]

Originally Posted by Raw422

There was a lean code but never came back. Just fixed a vacuum leak that took care of the bouncing at idle. I still feel like I am low boost. Here are some logs from this morning

https://datazap.me/u/raw422/log-1683...og=0&data=4-20

https://datazap.me/u/raw422/log-1683...og=0&data=4-20

https://datazap.me/u/raw422/log-1683...og=0&data=4-20

I am trying to learn as much as I can but still pretty new to this, I appreciate the help.

I'm not as familiar with N55 MHD logs, but the accelerator position looks strange. It definitely shows that you're not hitting boost/load targets so odd that there aren't more codes being thrown. The bouncing load req seems to match the accelerator pedal position in these logs, but it shows throttle position as 99.9/100 throughout, so I'm not sure what's going on there.

These cars are known to suffer various issues related vacuum leaks. If you found one vacuum leak already that was clearly affecting idle, chances are there are others that aren't as obvious; like at the boost control solenoid (or anything else not keeping the wastegate properly shut). You can find several posts where N5x owners replace all the vacuum lines as regular mx.

[Raw422]

Thanks!

If boost is low, is there any correlation to my wastegate position? Is there any way to tell from logs if there is a boost leak causing this or is the turbo just getting tired?

Any specific things I should be checking?

[PRTSB1M]

Originally Posted by Raw422

Thanks!

If boost is low, is there any correlation to my wastegate position? Is there any way to tell from logs if there is a boost leak causing this or is the turbo just getting tired?

Any specific things I should be checking?

I think the ECU is pretty good at catching boost leaks, and you don't have any codes for that so the only other thing I can think of is the compressor isn't spinning as fast as it should be. If that's true, the only causes would be exhaust bypassing the turbine (wastegate not shutting) or some other sort of failure in the turbo.

I would start by looking for more vacuum leaks, the lines are not that expensive and many people just use aftermarket vacuum hoses that are rated for high heat (silicone). The boost control solenoid could be bad and not properly controlling the wastegate position (not sure if this is in MHD logs or not).

I would also check all your electrical connections on the topside of the engine since the load req/accelerator appear to bounce together. There may be something wrong with throttle body/drive-by-wire/valvetronic.

[PRTSB1M]

I did a quick search for you, my money is on the valvetronic system
https://www.1addicts.com/forums/show....php?t=1841947

[Raw422]

Okay, I will search for more vacuum lines. What leads you to believe the Valvetronic System? Just curious as to what you think

[PRTSB1M]

Originally Posted by Raw422

Okay, I will search for more vacuum lines. What leads you to believe the Valvetronic System? Just curious as to what you think

Reading through that thread, it sounds like the valvetronic system has become a somewhat common issue. I traded my N55/S55 cars before ever having any trouble with it personally, but both were sub 60k mile cars.

One post in particular says something about it getting stuck in the low-lift position, thus restricting air flow. I can see in the logs that vanos looks to be functioning, but not sure if that also covers valvetronic (variable lift).

If it isn't a vacuum leak affecting boost control or the solenoid itself, it seems like the vavletronic system is the only other thing that could limit air flow to spin the turbo... so I guess my checklist would be:
1. vacuum leak
2. boost control solenoid
3. valvetronic