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X6Jack X6Jack is offline
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Default Newly installed JB4 on BMW X6 M power reduced - 07-14-2021, 02:30 PM

How long does the car need to adapt? If I give an estimated 80% throttle or more the car goes into reduced power mode right before it should have shifted. I have attached an error log from my Foxconn NT 510 elite. If I shut the car off and restart it everything is back to normal.

Thanks, Jack
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Terry @ BMS's Avatar
Terry @ BMS Terry @ BMS is offline
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Default 07-14-2021, 04:00 PM

Looks like the main problem is a misfire in cylinder6. And a variety of other issues you'll want to evaluate. Like the coolant pump.


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X6Jack X6Jack is offline
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Default 07-16-2021, 10:01 AM

I replaced the #6 coil and all codes have disappeared except the 2 for the coolant pump which I have confirmed is bad. What troubles me is I have no idea how long the pump has been bad and only found this issue after having misfires because of a bad coil.

Any idea how important the pump is? I assume with an inoperable pump the turbo temps will be higher than they should which will decrease the lifespan of the turbos. Is it possible that once the pump is fixed and the turbo temps are dropped I could see a slight performance gain?

Thanks, Jack
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KLR STINGER KLR STINGER is offline
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Default 08-25-2021, 10:55 AM

You will have high IATs and risk detonation and reduced power. Replace you pump asap. There are 2 on the F85/f86 so make sure you diagnose the correct one for replacement.
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X6Jack X6Jack is offline
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Default 08-26-2021, 08:50 AM

I replaced the pumps but a few weeks later I developed these codes.

2EC3
2F1D
2F1E
30FF
310B

I am getting oil on my heatshield which I hope is from a leaking crankcase hose that connects the airducts. As I was inspecting my crankcase system I noticed that the airducts were not tight into the turbos so I am replacing the turbocharger intake tube gaskets in addition to the crankcase hose.

I hope this fixes these issues and restores power to my X6.

Any thought on these codes?

Thanks
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Terry @ BMS's Avatar
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Default 09-02-2021, 07:27 PM

Have a current log to check the basics on the tuning end?


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X6Jack X6Jack is offline
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Default 09-13-2021, 08:51 AM

Hey Terry, so I had multiple issues that were exacerbated by the JB4 tune box. My initial issue was I had a coil fail. After I replaced the coil the car ran great for maybe a week or 2. But with the increased air pressure through the turbos a slight leak in the crankcase ventilation breather hose got a lot worse. At that time I decided to do a thorough inspection and found that turbocharger intake gaskets were very loose. I replaced the breather hose and gaskets several weeks ago and have not had a problem since.

Thanks for checking in with me.
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Default 09-13-2021, 03:20 PM

Yes, any time you start running more boost that will tax things a bit more and expose any weaknesses. Glad you found the culprits!



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