Metallic "clink" or "knock" on hard acceleration

aajami · 11-13-2014, 09:23 PM

Quote:

Originally Posted by Mike Benvo

What is 240J software? Do you mean 240E?

If by J you mean "japan" spec software, it's 240EEKJV0, and this shouldn't be used in US spec vehicles and may be a contributing factor to the issue you are experiencing.

I was on mobile which doesn't show signatures.

Yup, I meant the version of the software designed for the Japanese domestic market.

DOCTOR.Y · 12-27-2018, 05:09 AM

Quote:

Originally Posted by aajami

Hey guys,

First of all, I know the issue of the "clink" from the diff when slowly accelerating from a stop (especially during cold start) has been discussed to death -- this is not what this question is about.

I've been hearing what sounds like engine knocking when quickly accelerating from a coast. That is, when I'm coasting at about 40MPH in 3rd and then stomp the gas pedal to speed up quickly, I hear a metallic "clink" sound come from the engine that lasts a fraction of a second. It sounds a lot like an engine knocking or pinging, but it's not sustained. It's there and it's gone as soon as you give it gas.

Does anyone know if that's an actual engine knock? If so, any ideas how to remedy it? If not, any ideas what it might be?

OP, did you find out the reason?

aajami · 12-27-2018, 05:12 AM

Quote:

Originally Posted by DOCTOR.Y

Quote:

Originally Posted by aajami

Hey guys,

First of all, I know the issue of the "clink" from the diff when slowly accelerating from a stop (especially during cold start) has been discussed to death -- this is not what this question is about.

I've been hearing what sounds like engine knocking when quickly accelerating from a coast. That is, when I'm coasting at about 40MPH in 3rd and then stomp the gas pedal to speed up quickly, I hear a metallic "clink" sound come from the engine that lasts a fraction of a second. It sounds a lot like an engine knocking or pinging, but it's not sustained. It's there and it's gone as soon as you give it gas.

Does anyone know if that's an actual engine knock? If so, any ideas how to remedy it? If not, any ideas what it might be?

OP, did you find out the reason?

Quote:

Originally Posted by DOCTOR.Y

OP, did you find out the reason?

Nope. I'm at 70,000 miles and it stopped doing this about 25,000 miles ago.

DOCTOR.Y · 12-27-2018, 05:20 AM

Quote:

Originally Posted by aajami

Nope. I'm at 70,000 miles and it stopped doing this about 25,000 miles ago.

Did you replace the spark plug or engine mount at that time?

aajami · 01-05-2019, 02:03 AM

Quote:

Originally Posted by DOCTOR.Y

Did you replace the spark plug or engine mount at that time?

The spark plugs may have been replaced as part of the car's annual maintenance, though I'm not sure -- would need to go back and look through its service history over the last 3-4 years. Engine mounts have never been touched.

DOCTOR.Y · 01-05-2019, 08:01 AM

Quote:

Originally Posted by aajami

Quote:

Originally Posted by DOCTOR.Y

Did you replace the spark plug or engine mount at that time?

The spark plugs may have been replaced as part of the car's annual maintenance, though I'm not sure -- would need to go back and look through its service history over the last 3-4 years. Engine mounts have never been touched.

Thanks for the info op. Some say changing spark plug may stop this knocking noise. So just want to see if it is your case

MisterClutch888 · 09-02-2020, 07:59 PM

im having a similar "knock", "clink" under load in low rpm. just changed rod bearings, engine mounts and spark plugs.

This makes me nervous. i will try to capture the noise asap and post here.

e92m3RN · 12-23-2020, 06:22 AM

Quote:

Originally Posted by MisterClutch888

im having a similar "knock", "clink" under load in low rpm. just changed rod bearings, engine mounts and spark plugs.

This makes me nervous. i will try to capture the noise asap and post here.

Did you ever figure out what was causing the clink? I am having the same noise and did the rod bearings and engine mounts about 7 months ago.

94jedi · 12-27-2020, 07:54 AM

Probably the center support bearing/driveshaft.

MisterClutch888 · 01-05-2021, 11:02 AM

Quote:

Originally Posted by e92m3RN

Quote:

Originally Posted by MisterClutch888

im having a similar "knock", "clink" under load in low rpm. just changed rod bearings, engine mounts and spark plugs.

This makes me nervous. i will try to capture the noise asap and post here.

Did you ever figure out what was causing the clink? I am having the same noise and did the rod bearings and engine mounts about 7 months ago.

Is the engine knock. Im currently switched to chevron 91 and a can of liqimoly ceratec, seems ok.

09-02-2020, 07:59 PM	#29
MisterClutch888 Lieutenant 552 Rep 580 Posts Drives: 2011 E90 M3 6MT ZCP Join Date: Apr 2020 Location: 604 \| 852 iTrader: (8)	im having a similar "knock", "clink" under load in low rpm. just changed rod bearings, engine mounts and spark plugs. This makes me nervous. i will try to capture the noise asap and post here. __________________ Current - 2011 E90 M3, Jet Black, 6MT ZCP. Recaro/Bilstein/BBS/StopTech/Haimus/Turner/Pinnacle/BE/Auto Solutions/Macht Schnell/GC/Whiteline/Slon/Alpine Sold - 2008 E92 M3, AW x FR, 6MT. CF roof is oh-so-Sexy! IG @misterclutch888 Slow Build
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12-27-2020, 07:54 AM	#31
94jedi Major 830 Rep 1,254 Posts Drives: 2009 e92 M3 Join Date: Oct 2014 Location: United States iTrader: (0)	Probably the center support bearing/driveshaft. __________________ 2009 E92 M3 build thread: https://www.m3post.com/forums/showthread.php?t=1754875 Follow me on IG - www.instagram.com/the_driven_enthusiast
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