[gomichaelkgo]

I've had this weird noise in my F30 since the day I bought it new. Turns out it was a bad connecting rod bearing. After multiple visits to the dealer with a "could not duplicate" diagnosis, they finally troubleshot it in earnest and found excessive wear in one of the cylinders. I'm not happy about the situation. I was rather hoping it would have been a broken bell housing bolt or an exhaust component.

Edit/Update: it wasn't the engine. After the complete engine replacement, I hear this under moderate engine load at cold start, but only intermittently. It sounds like a goat in the engine bay.

[335BOY]

....not a lot of bearings on pistons............

[gomichaelkgo]

Originally Posted by 335BOY

....not a lot of bearings on pistons............

ok fine, connecting rod bearing.

[335BOY]

can barely hear it on vid. Must sound brutal live. That would be th episton slapping the cylinder i guess. They will probably give you new short block if walls are scored badly .

[E92Jay]

Eww, throwing a rod bearing so soon? Any ideas why?

[gomichaelkgo]

Originally Posted by 335BOY

can barely hear it on vid. Must sound brutal live. That would be th episton slapping the cylinder i guess. They will probably give you new short block if walls are scored badly .

You can hear it best at 0:05. Sorry for the poor audio -- it was an intermittent sound and definitely audible. I had to resort to whipping out the phone to catch it. They're replacing the entire engine assembly.

[gomichaelkgo]

Originally Posted by E92Jay

Eww, throwing a rod bearing so soon? Any ideas why?

It came bad from the factory. I heard it the second time I turned the car on. In retrospect, I should have hounded the dealer about it harder from the start. I kept hoping it would go away after the break-in period.

[Elk]

Originally Posted by E92Jay

Eww, throwing a rod bearing so soon? Any ideas why?

Likely a mistake in assembling the engine, such as reversing the bearing thereby leading to lubrication failure.

OP, sorry to learn of your issue. Very frustrating.

[rallybull]

Holy sh1t. This is exactly the sound I have been complaining about right from the beginning. It is like a "click click" sound coming from the engine when you try to accelerate modestly (without making engine speed too high) at slow speed.

It is almost impossible to replicate this issue since it happens mostly on a cold engine for me.

What is the fix for this issue? New engine???

[FotiosF90M5]

Damn. That's the exact wierd noise my car has been making since new. Figured it was just some sort of engine heat shield vibrating. Gotta be kiddin me. It feels fine though. Just another thing I need to try and have them fix.

[bavarianride]

wow 0:05 does not sound good! How did the dealer diagnose that one cylinder has excessive wear? Maybe a compression test? Mine is N26, it has some wierd sound during acceleration, but it is more like a whirlwind noise than a knocking one like your video. The tech said it is normal turbo spinning sound.

[Mobster1983]

How long have you had the car and how many miles does it have on it? I would definitely try to do a vehicle buy-back and get a new BMW. Having the engine replaced so early is not good and will likely kill the resale value (unless it's a lease).

[henryeeex]

Originally Posted by fotios335i

Damn. That's the exact wierd noise my car has been making since new. Figured it was just some sort of engine heat shield vibrating. Gotta be kiddin me. It feels fine though. Just another thing I need to try and have them fix.

I also have the same noise randomly when the AC is off. With the AC on, this sound goes away for good. I tried to diagnose this sound with my dealer a few times. He adjusted the heat shield once (which did help a lot actually). The noise is still there randomly with the AC off. My dealer foramen then got a loaner f30 335i and we tested that out and the noise was intermittently there too. Your video also sounds like this video

.
Seems like a fair amount of forum members with F30 335i experienced this noise too in their own car; how likely that all our engines have a bad connecting rod bearing? T_T

[rallybull]

I'm taking my car back to the shop. How many of you facing this sound have experienced this clicking engine sound only during the first 5 minutes from a cold start?

[Steve33]

Originally Posted by rallybull

I'm taking my car back to the shop. How many of you facing this sound have experienced this clicking engine sound only during the first 5 minutes from a cold start?

I experience a clicking noise all the time, but not sure where it comes from. Before work in the AM I'll pop the hood and check the origin.

[335BOY]

Originally Posted by rallybull

I'm taking my car back to the shop. How many of you facing this sound have experienced this clicking engine sound only during the first 5 minutes from a cold start?

Originally Posted by Steve33

I experience a clicking noise all the time, but not sure where it comes from. Before work in the AM I'll pop the hood and check the origin.

Valve train. As oil warms it climbs to top and stops ticking.

[Elk]

Direct injection also ticks as a result of turning on and off the fuel. The fuel is highly pressurized with DI. The 328 is much worse than the 335 in this regard. This is less an issue when the engine is warm.

Very few will have a failing bearing and are probably hearing other, perfectly normal, noises.

[335BOY]

true, good point.

[kppanic]

Originally Posted by Steve33

I experience a clicking noise all the time, but not sure where it comes from. Before work in the AM I'll pop the hood and check the origin.

ahhh the clicking noise! my car permanently had it and happens when the gas pedal is pressed. annoyinggggggggggg but I can seem to find where it is coming from. Happens on cold ambient temperature. let me know if you find a fix for this..

[kppanic]

Originally Posted by 335BOY

Valve train. As oil warms it climbs to top and stops ticking.

mine never stops ticking or clicking.
even when the engine is fully warmed and been driven for hours. Only when the gas pedal is pressed...

[gomichaelkgo]

Originally Posted by rallybull

Holy sh1t. This is exactly the sound I have been complaining about right from the beginning. It is like a "click click" sound coming from the engine when you try to accelerate modestly (without making engine speed too high) at slow speed.

It is almost impossible to replicate this issue since it happens mostly on a cold engine for me.

What is the fix for this issue? New engine???

Yes, the solution was a new engine. At least I hope that was it. The dealer still has the car. You should try and get a video of your car doing it. That will help the shop people a lot in narrowing down what kind of intermittent noise they're looking for.

[gomichaelkgo]

Originally Posted by f30fanboy

wow 0:05 does not sound good! How did the dealer diagnose that one cylinder has excessive wear? Maybe a compression test? Mine is N26, it has some wierd sound during acceleration, but it is more like a whirlwind noise than a knocking one like your video. The tech said it is normal turbo spinning sound.

I believie they took the oil pan off or took the top of the engine off. I haven't seen it in person, so I don't have a lot of detail. Sorry!