N52 e92 knocking

[Flame]

Hi all.

Any help, my e92 325 just all a sudden got a knocking sound.

After many youtube videos i see it can be from a rod to a loose injector and even a aircon bearing.

If it is a rod, does that happen instantly???

I can whatsapp the sound if any can give me light on this.
Inbox me your number please if possible

Thanks
Bertus

 

[BeemerFanatic]

I’m not a mechanic but this is my very very basic understanding. Rod bearings could get worn out and cause damage to the crank. Also metal pieces will be seen in the oil and oil filter. Like metal dust. Best to have a good BM mechanic look into it. This is normally caused by not warming up the engine to optimal temps before driving spirited or even revving. This prevents the oil from getting hot and thinner and gets inbetween all internal components and lubricate them. The injector not sure if a knock will be heard however if one injector is faulty, unplugging the coil packs one at a time while the engine is running will show if there is a difference to the noise or not. But really get a mechanic to check out. Rather not drive the car. Good luck

 

[MR_Y]

Where are you based?
I know an independent that is open this December in Midrand.

 

[Flame]

Im in cape town area.... but does a rod jus t go instantly???? no wear on it before it go?

here the link to the video of the guy with a injector...https://youtu.be/ilBkzca58AE

here a link to a a/c bearing....https://youtu.be/kqj_8NmxBbw

both sound similar to mine...

NB: also machanic had diagnostics on it before knock was their, gave vanos egear error code....

Can it be vanos maby?

Also , engine light never came on and stil aint on...possible its not even in the engine?

Was bought at webuycars....they rejected to fix it, now im on a case at ombudsman...but holidays is here and to be without a car is hell, since i did not have a car for 4 years, and went to USA to work my bud of to buy one, then i drove it 2 weeks and boom

I’m not a mechanic but this is my very very basic understanding. Rod bearings could get worn out and cause damage to the crank. Also metal pieces will be seen in the oil and oil filter. Like metal dust. Best to have a good BM mechanic look into it. This is normally caused by not warming up the engine to optimal temps before driving spirited or even revving. This prevents the oil from getting hot and thinner and gets inbetween all internal components and lubricate them. The injector not sure if a knock will be heard however if one injector is faulty, unplugging the coil packs one at a time while the engine is running will show if there is a difference to the noise or not. But really get a mechanic to check out. Rather not drive the car. Good luck

 

[Gordvisr]

if you could get the car up on ramps and listen from the bottom, should give you a better indication, he N52 engines usually do not run bearings but, if it was not serviced regularly or ran low on oil it can happen and yes, it can happen all of a sudden. Hope you get it sorted soon and the damage is not too much.

 

[Flame]

Can anyone tell me why engine light dont / did not come on?

 

[DarrylvanNiekerk]

Im in cape town area.... but does a rod jus t go instantly???? no wear on it before it go?

here the link to the video of the guy with a injector...https://youtu.be/ilBkzca58AE

here a link to a a/c bearing....https://youtu.be/kqj_8NmxBbw

both sound similar to mine...

NB: also machanic had diagnostics on it before knock was their, gave vanos egear error code....

Can it be vanos maby?

Also , engine light never came on and stil aint on...possible its not even in the engine?

Was bought at webuycars....they rejected to fix it, now im on a case at ombudsman...but holidays is here and to be without a car is hell, since i did not have a car for 4 years, and went to USA to work my bud of to buy one, then i drove it 2 weeks and boom

To me they sound very different but you should be able to locate approximately where the sound is coming from and then start looking in that direction.

Injectors - the sound will come from the head, check if it is front back or middle.
I doubt it is injectors because I believe e92 is still port injection not direct injection so lower pressure and most likely lumpy idle and bad running not massive clicking though this you would hear from the intake manifold, which is plastic not metal.

Rod knock - doesn't usually start straight away unless you have severe oil starvation or a blockage on the oil pickup or damage to the oil pump. This sound will come from the lower part of the engine. The results of this can be catastrophic.

If it is the compressor you will hear it from the lower front right of the engine bay and serpentine belt.

Isolate where it is coming from them it is easier to diagnose.
Only at idle, throughout rev range, only while driving, when car is hot, only on startup.

It could be VANOS or head related, bad lifter or damaged cam which will cause more if a ticking but if the VANOS bolt had failed this will cause major timing issues and well as some knocking.

 

[DarrylvanNiekerk]

Can anyone tell me why engine light dont / did not come on?

A lot of these issues won't cause an engine light because it does not necessarily interfere with the running is the engine.

You might have a lean condition which the computer will try to resolve by increasing fuel flow. Even with all the sensors they can only pick up so much information and will first try to resolve the issue itself. If you were to put a launch machine on it you might find misfire codes or some other issues but these don't always bring up an engine failure light.

 

[KarshS]

Take it to a mechanic or get one to come have a look at it.

Getting answers from people assuming sounds on the internet isn't the answer you looking for.

 

[FiRi@Rennzport]

The car is 2 weeks old?

Shew sorry man.

As Karsh said, get a mech to check it and continue in legal case with WBC... 2 weeks is nuts

Sent from my SM-S918B using Tapatalk

 

[NBN]

Send the oil for a black stone oil analysis, cheapest and easiest way to say if their is metal and how much metal is in your oil.

You can also remove the oil filter, dry it out and check if their is metal in the paper element of the filter.

 

[TurboLlew]

I have listened to many a video on the internet thinking it was similar and in practice it is very different. This is like trying to go to WebMD - it will tell you you are dying of some dreaded disease when you might just have a cold. Agree with Karsh & Firi: a good mech will be able to tell you what's wrong. The fact that there were vanos codes originally gives you a starting point of sorts... can check the timing and check the gear.

A simple thing to do which you've probably already done is to just check the oil cap or oil itself (seems you've run it this way for a few kms at least). If the oil has glitter/filings in it in direct bright light/sunlight, you know it's a rod bearing or similarly catastrophic situation (failing internal components can clog the fine VANOS mesh/filter on some cars (not sure if yours is one of them) causing a code as well). (note: glitter can confirm, but a lack of glitter isn't a sign everything is well)

 

[Flame]

I have listened to many a video on the internet thinking it was similar and in practice it is very different. This is like trying to go to WebMD - it will tell you you are dying of some dreaded disease when you might just have a cold. Agree with Karsh & Firi: a good mech will be able to tell you what's wrong. The fact that there were vanos codes originally gives you a starting point of sorts... can check the timing and check the gear.

A simple thing to do which you've probably already done is to just check the oil cap or oil itself (seems you've run it this way for a few kms at least). If the oil has glitter/filings in it in direct bright light/sunlight, you know it's a rod bearing or similarly catastrophic situation (failing internal components can clog the fine VANOS mesh/filter on some cars (not sure if yours is one of them) causing a code as well). (note: glitter can confirm, but a lack of glitter isn't a sign everything is well)

Hi

Car was serviced 600km ago . When i heard the sound just went home and did not drive it yet.

Will a person stil see something in the oil if it was just serviced? Or will their be something in dueit happend after service?

Can timing and gear create a knock? If gears and timing is fixed, will it be fixed if it is it?

Please advice.

 

[AudiDriver]

Hi

Car was serviced 600km ago . When i heard the sound just went home and did not drive it yet.

Will a person stil see something in the oil if it was just serviced? Or will their be something in dueit happend after service?

Can timing and gear create a knock? If gears and timing is fixed, will it be fixed if it is it?

Please advice.

You need a mechanic as the other guys said - we will all be guessing here. Sometimes identifying the source of the sound is pretty straight forward to a trained ear and using the right equipment. You aren’t going to get a diagnosis from behind your keyboard unfortunately, as some of the other members pointed out.

With regards to seeing contamination in oil serviced 600km ago - it depends if there is serious damage and when it occurred. You possibly could, but if the cause is engine related and happened prior to the service then the evidence is probably gone.


Sent from my iPhone using Tapatalk

 

[Sabretooth tiger]

Have a mechanic check it out as others said. I know a brilliant master tech if you like pm me and I can send you his number. He is in the Eersterivier area but he does sometimes go out to customers.

 

[DarrylvanNiekerk]

You definitely need a mechanic to resolve the issue as mentioned because a video doesn't give enough sound quality or the exact location.

Trying to guess a fault based on "sounds like" and "from the engine" is near to impossible.

Use the expert diagnosis then to argue with the seller.