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  #1  
Old 04-01-2019, 09:27 PM
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4.8 N62 engine Knock/Ping

Does anyone experience this from time to time during acceleration?
I'm running my usual Shell V-power 91. Not sure if its Vanos Timing, knock sensors, etc.
No codes coming up at all, and i'm using Rheingold to diagnose.
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Old 04-01-2019, 11:48 PM
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Mine pings under light acceleration, and it gets worse the hotter it get outside. If I push my foot further down on the accelerator, the pinging stops.

No codes. Spark plugs were replaced 30k miles ago. Didnít change much.
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Old 04-02-2019, 08:17 AM
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Thanks. My old M54 motor used to do the same, just wondering if its just something some BMW engines are prone to do?
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Old 04-03-2019, 07:16 PM
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What happens if you go up octane? 93,94? Knocking like that on an N62 engine isn't what usually happens.


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Old 04-03-2019, 09:35 PM
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In most modern engines there are knock sensors, they will retard timing well before you can hear any knock.



If they are broken, the DME should AUTOMATICALLY pull timing (dramatically) to avoid engine damage.


I dont understand how a modern BMW engine can ping or knock. Anyone know how this occurs, im all ears
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Old 04-03-2019, 11:28 PM
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Quote:
Originally Posted by ard View Post
In most modern engines there are knock sensors, they will retard timing well before you can hear any knock.



If they are broken, the DME should AUTOMATICALLY pull timing (dramatically) to avoid engine damage.


I dont understand how a modern BMW engine can ping or knock. Anyone know how this occurs, im all ears
Yeah I know about the knock sensors. I've seen other forums where they have changed them like on the m54 motors but eventually the pinging comes back.

Higher octane, not much difference, and i have also tried to reset the adaptations. My fuel trims are low, smooth running values are all close to zero.

I'm lost!
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Old 04-04-2019, 12:15 AM
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There is a TON of misinforamtion about this.


Changing knock sensors is a fools errand UNLESS you have knock sensor fault codes.


https://f01.justanswer.com/Montmotor...ck+Control.pdf


It isnt knock.
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Old 04-04-2019, 12:42 PM
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Quote:
Originally Posted by dadysev View Post
Thanks. My old M54 motor used to do the same, just wondering if its just something some BMW engines are prone to do?
Thatís funny, my M54 did the same thing.

Itís only audible if the windows are down and youíre driving next to a wall of some kind for the sound to bounce off of.
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Old 04-05-2019, 12:44 PM
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Quote:
Originally Posted by ard View Post
There is a TON of misinforamtion about this.


Changing knock sensors is a fools errand UNLESS you have knock sensor fault codes.


https://f01.justanswer.com/Montmotor...ck+Control.pdf


It isnt knock.
Good find. but its very intermittent. during acceleration i may here the knock or ping a few times. My M54 motor would do it also.
Very true about changing the 4 little microphones, as i have no knock errors. i just figured the system would react a lot quicker.

They must be working as the DME does adjust and it eventually goes away. I know up here in Canada also that our fuel quality is not the greatest.
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