[Supr3me]

Ha yeah, I'm already talking with my tuner about a 93 or E20 map for winter. I'll probably be asking the group at what ethanol level the hard starts are a real issue. I didn't see them get bad until E50 but I imagine at 0°F even E30 might be too much.

[ProjektAutoScott]

I've been through quite a few 340i and 440is (private dealership, I only sell BMW) and I generally put at least 200 miles on each car to make sure everything is right for the next owner. Just got in a 16 340iX with about 30K and it doesn't rev very "freely". It seems to drive normal, and makes full power, but it lags like crazy when trying a rev in P or N. Clean filter, fresh fuel, warmed up, service is current, no tunes, etc.

Throttle response is notably slow to pick up until it passes 3K RPM, then it's fine. I know I'm not crazy because I have 3 others right next to me as reference. No codes, no engine lights. I've reset the trans/throttle to no avail. Dealer says nothing is wrong, but I can just feel it's off. You'd have to have driven a few other B58 cars to know it's a problem. Anyone in the same boat?

[jackstrath]

Originally Posted by ProjektAutoScott

I've been through quite a few 340i and 440is (private dealership, I only sell BMW) and I generally put at least 200 miles on each car to make sure everything is right for the next owner. Just got in a 16 340iX with about 30K and it doesn't rev very "freely". It seems to drive normal, and makes full power, but it lags like crazy when trying a rev in P or N. Clean filter, fresh fuel, warmed up, service is current, no tunes, etc.

Throttle response is notably slow to pick up until it passes 3K RPM, then it's fine. I know I'm not crazy because I have 3 others right next to me as reference. No codes, no engine lights. I've reset the trans/throttle to no avail. Dealer says nothing is wrong, but I can just feel it's off. You'd have to have driven a few other B58 cars to know it's a problem. Anyone in the same boat?

The "lag" in N or P is most likely the softwear update your feeling, this was brought out about this time last year iirc

[BrettKA7]

In this thread, I counted 9 cases of engine replacement (some with turbo replacement as well, some without) and 3 cases of only turbo replacement.

25 pages with a lot of spam from Musashi, so I could have missed some things.

Hopefully the B58 ends up being reliable enough to keep long term. I love my M240i but if it has any major issues before the warranty ends June 2022, I’ll find something else from another brand. This F22 with the B58 is BMW’s last chance with me.

[StannisBaratheon]

I get some cabin vibration with the AC on at idle, but I think it's normal. Could also be the engine mounts softening up? Mine is a 2016 340ix with 52k miles.

[pakman340xi]

I've been researching the FB group "B58 enthusiasts" for what possible issues are coming up and this is what keeps coming up:

-Low coolant in resevoir tank...Dealers say to top off coolant
-PCV issues
-injector failure
-blow by issues...mostly for 2016 models

Most of these owners are tuned and pushing 20+psi, but there have been a few owners with stock tunes reporting they have these issues.

The coolant issue seems to be the most common.

[G.Newt]

Originally Posted by ProjektAutoScott

I've been through quite a few 340i and 440is (private dealership, I only sell BMW) and I generally put at least 200 miles on each car to make sure everything is right for the next owner. Just got in a 16 340iX with about 30K and it doesn't rev very "freely". It seems to drive normal, and makes full power, but it lags like crazy when trying a rev in P or N. Clean filter, fresh fuel, warmed up, service is current, no tunes, etc.

Throttle response is notably slow to pick up until it passes 3K RPM, then it's fine. I know I'm not crazy because I have 3 others right next to me as reference. No codes, no engine lights. I've reset the trans/throttle to no avail. Dealer says nothing is wrong, but I can just feel it's off. You'd have to have driven a few other B58 cars to know it's a problem. Anyone in the same boat?

Dumb question, but does the symptom persist in sport/sport+ mode?

[G.Newt]

Originally Posted by pakman340xi

I've been researching the FB group "B58 enthusiasts" for what possible issues are coming up and this is what keeps coming up:

-Low coolant in resevoir tank...Dealers say to top off coolant
-PCV issues
-injector failure
-blow by issues...mostly for 2016 models

Most of these owners are tuned and pushing 20+psi, but there have been a few owners with stock tunes reporting they have these issues.

The coolant issue seems to be the most common.

2016 340ix here. I've gotten the low coolant once at 11k and I had a PCV issue (breather valve) fixed under warranty. Just had my local mechanic do an oil change. He put the used oil back into the original bottles and he noted I only lost about half a quart. So luckily no blow by issues, but I'm not pushing 20psi.

[msk340i]

Originally Posted by StannisBaratheon

I get some cabin vibration with the AC on at idle, but I think it's normal. Could also be the engine mounts softening up? Mine is a 2016 340ix with 52k miles.

I have this too and had it with 3 other BMW's a 550i, 325i, and an X3. Every time the dealer says it's normal. Idk

[NormanConquest]

Originally Posted by BrettKA7

In this thread, I counted 9 cases of engine replacement (some with turbo replacement as well, some without) and 3 cases of only turbo replacement.

25 pages with a lot of spam from Musashi, so I could have missed some things.

Hopefully the B58 ends up being reliable enough to keep long term. I love my M240i but if it has any major issues before the warranty ends June 2022, I’ll find something else from another brand. This F22 with the B58 is BMW’s last chance with me.

80k right now no issues with oem setup and diligent maintenance

[vcx]

Originally Posted by ProjektAutoScott

I've been through quite a few 340i and 440is (private dealership, I only sell BMW) and I generally put at least 200 miles on each car to make sure everything is right for the next owner. Just got in a 16 340iX with about 30K and it doesn't rev very "freely". It seems to drive normal, and makes full power, but it lags like crazy when trying a rev in P or N. Clean filter, fresh fuel, warmed up, service is current, no tunes, etc.

Throttle response is notably slow to pick up until it passes 3K RPM, then it's fine. I know I'm not crazy because I have 3 others right next to me as reference. No codes, no engine lights. I've reset the trans/throttle to no avail. Dealer says nothing is wrong, but I can just feel it's off. You'd have to have driven a few other B58 cars to know it's a problem. Anyone in the same boat?

I have a 6MT 340i xdrive, and to be honest, I really doubt the official engine diagram, where peak torque is supposed to arrive at around 1350 rpm already, because I really don't feel so much torque in the low end of rpm, even with a tune. Even my old E90 330i (272 hp) felt more responsive at very low rpm.

Edit: I also don't see the advertised torque value on the torque gauge.

[StannisBaratheon]

2016 340i Xdrive with just under 55k miles

Car is at the dealer for low coolant (again) and a rattling noise which I'm 99% sure is turbo waste gate. They confirmed the water pump is leaking but still diagnosing the rattle. Car was purchased CPO last year so I think the water pump is (hopefully) covered under warranty.

These seem to be a common failure item on the B58 but it looks like an easy DIY repair. The last water pump replacement I did was on VW CC and it buried under the intake manifold (and is driven by same intermediate shaft as the oil pump) and that was a solid 5-6 hours with the car on rhino ramps since a million hoses and pipes had to come off. By comparison the B58 should be a breeze.

[damienkim]

2016 340xi m sport mhd 2 xhp 2 vrsf dp 45k


check engine light goes on and off randomly after refueling the roar would not work.. found that strange not sure if it was related.. long story short it was the fuel tank vent valve. scoped the valve found it to be not where it should be. been a week no lights. roar works every time.

[DickBlisken]

Originally Posted by StannisBaratheon

2016 340i Xdrive with just under 55k miles

Car is at the dealer for low coolant (again) and a rattling noise which I'm 99% sure is turbo waste gate. They confirmed the water pump is leaking but still diagnosing the rattle. Car was purchased CPO last year so I think the water pump is (hopefully) covered under warranty.

These seem to be a common failure item on the B58 but it looks like an easy DIY repair. The last water pump replacement I did was on VW CC and it buried under the intake manifold (and is driven by same intermediate shaft as the oil pump) and that was a solid 5-6 hours with the car on rhino ramps since a million hoses and pipes had to come off. By comparison the B58 should be a breeze.

Any update on the rattling?

[StannisBaratheon]

Originally Posted by DickBlisken

Any update on the rattling?

Nothing yet, hopefully I hear back early next week.

[StannisBaratheon]

Originally Posted by StannisBaratheon

Nothing yet, hopefully I hear back early next week.

Got an update from the dealer today - Turbo and water pump are being replaced under warranty at 55k miles. Hopefully the replacements hold up for at least another 55k miles.

I've been getting a noise under light throttle cruising on the highway and it's been driving me crazy, I've wondered if it's gasses going past the waste gate. Guess I'll find out in a few days.

[VVlasy]

Originally Posted by StannisBaratheon

Got an update from the dealer today - Turbo and water pump are being replaced under warranty at 55k miles. Hopefully the replacements hold up for at least another 55k miles.

I've been getting a noise under light throttle cruising on the highway and it's been driving me crazy, I've wondered if it's gasses going past the waste gate. Guess I'll find out in a few days.

Do let us know about the noise on highway, I have the same issue.

[B58 parts]

45k .. no real issues.

Is this car supposed to run around 230 degrees? My temp gauge since day 1 has always been around 40% .. 230 oil temp 230 coolant temp.

I have a little coolant smell near the tank when I get home .. it still hasn't gotten low and holds the same temp, oil analysis has always been a1 no water no nothing. I tried replacing the cap.

What's a good mileage to replace the turbo? Water pump?

I find bleeding the clutch often really helps. I need help with heat mgmt. Maybe that csf radiator is a go? Mine is filled with bugs.

[cfm56d7b]

This thread seems to be more active than other "low coolant in a B58 engine" threads.

Please share your low coolant issue, dealer response, root cause.

My car - 2017 400i GC - is being monitored by the dealer for coolant loss. Anti tamper seal has been placed under the reservoir cap. As all of us are driving less during Covid-19 pandemic, the coolant loss will manifest at a slower rate.

Another forum member reported coolant loss through turbo bearing. The turbocharger has been replaced but this problem appears to be rare and affects vehicles produced in 2016.

[BMWILUVU]

Coolant cap o-ring, improper coolant flush fill at the factory or service center, leaky coolant tank, turbo bearing are the causes from most frequent to least frequent cause. My cause was coolant cap at first and it was replaced and it was fine. The next time it happened, the service center worked at it and found a leaky coolant tank and it was fine again until I needed service for another matter which required coolant flush. Improper flush allows pockets to fill with coolant over time and cause what seems to be coolant loss. Everything was fine again after they flushed properly. I had all 3 of the first 3 issues listed and has been perfectly fine now.

[cfm56d7b]

Originally Posted by BMWILUVU

Coolant cap o-ring, improper coolant flush fill at the factory or service center, leaky coolant tank, turbo bearing are the causes from most frequent to least frequent cause. My cause was coolant cap at first and it was replaced and it was fine. The next time it happened, the service center worked at it and found a leaky coolant tank and it was fine again until I needed service for another matter which required coolant flush. Improper flush allows pockets to fill with coolant over time and cause what seems to be coolant loss. Everything was fine again after they flushed properly. I had all 3 of the first 3 issues listed and has been perfectly fine now.

The main reservoir cap was also replaced on my vehicle after white residue has been found under the cap.

I am more concerned about the issue reported by another forum member where coolant was slowly leaking through the turbo bearing.

[BMWILUVU]

Originally Posted by cfm56d7b

The main reservoir cap was also replaced on my vehicle after white residue has been found under the cap.

I am more concerned about the issue reported by another forum member where coolant was slowly leaking through the turbo bearing.

Your service center should have performed a pressure test and detect any leakage in the turbo. My levels have held steady. I would not worry about turbo bearings unless the first 3 issues I listed are looked at first.