Rod knock?

dekelley1 · 02-04-2020, 12:46 AM

Today, I started hearing a knock coming from the engine at idle. Doesnt get louder when I rev the engine. Not sure if its rod knock, what does it sound like to you? I know I've also got some injector noise also, but you'll be able to tell the difference.

https://s.amsu.ng/xcCrcyyXGIBN

TunafishE93 · 02-04-2020, 02:24 AM

Its hard to tell but I would guess not rod. When I had issues with rods it was RPM dependent. Just a guess, exhaust leak..

dekelley1 · 02-04-2020, 08:16 AM

Went out this morning, started the car and no knock. However, after hearing up
A bit the knock came back, maybe it's just me but it seems louder now.

feuer · 02-04-2020, 08:44 AM

When engine warms up and oil get hot it will knock more.

dekelley1 · 02-04-2020, 08:57 AM

Quote:

Originally Posted by feuer

When engine warms up and oil get hot it will knock more.

So you're thinking it is indeed rod knock?

tlow98 · 02-04-2020, 09:17 AM

Quote:

Originally Posted by dekelley1

So you're thinking it is indeed rod knock?

He’s giving you things to look for to confirm or not confirm your issue.

dekelley1 · 02-04-2020, 09:27 AM

Quote:

Originally Posted by tlow98

He’s giving you things to look for to confirm or not confirm your issue.

I took it as him confirming why it doesnt start knocking until the engine gets warm.
Since that was my last post prior to him posting.

tlow98 · 02-04-2020, 09:58 AM

Quote:

Originally Posted by dekelley1

I took it as him confirming why it doesnt start knocking until the engine gets warm.
Since that was my last post prior to him posting.

Gotcha. Confused. Your post didn’t say warming up?

feuer · 02-04-2020, 10:14 AM

Quote:

Originally Posted by dekelley1

I took it as him confirming why it doesnt start knocking until the engine gets warm.
Since that was my last post prior to him posting.

Quote:

Originally Posted by tlow98

Gotcha. Confused. Your post didn’t say warming up?

I think is rod knock yes. Did you have any repairs done recently.

MartinWake · 02-04-2020, 10:17 AM

No, its not rod knock it does not change with rpm this is rod knock:

dekelley1 · 02-04-2020, 11:40 AM

Quote:

Originally Posted by feuer

I think is rod knock yes. Did you have any repairs done recently.

No repairs done, I did just change my oil from mobile 1 to liquid moly
2k miles ago.

dekelley1 · 02-04-2020, 04:19 PM

Quote:

Originally Posted by dekelley1

No repairs done, I did just change my oil from mobile 1 to liquid moly
2k miles ago.

Anyone else have an opinion or heard this sound before?

smass · 02-04-2020, 04:29 PM

As loud as that is, you should be able to figure out what area of the engine it is coming from. Pick up a mechanics stethoscope. https://www.autozone.com/test-scan-a...iece/70131_0_0

Poke around the valve cover, block, exhaust and so on.

dekelley1 · 02-05-2020, 06:12 PM

Got a scope, but when I went to pinpoint the knock went out to check and the knocking is completely gone!! I cant reproduce it at the moment. What the heck could be going on. A rod doesnt just stop knocking all of a sudden.

02-04-2020, 12:46 AM	#1
dekelley1 New Member 0 Rep 13 Posts Drives: 335IS Join Date: May 2018 Location: Seattle, WA iTrader: (0)	Rod knock? Today, I started hearing a knock coming from the engine at idle. Doesnt get louder when I rev the engine. Not sure if its rod knock, what does it sound like to you? I know I've also got some injector noise also, but you'll be able to tell the difference. https://s.amsu.ng/xcCrcyyXGIBN
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02-04-2020, 02:24 AM	#2
TunafishE93 Major 418 Rep 1,152 Posts Drives: BMW 335i Join Date: Dec 2019 Location: NV iTrader: (0)	Its hard to tell but I would guess not rod. When I had issues with rods it was RPM dependent. Just a guess, exhaust leak..
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02-04-2020, 08:16 AM	#3
dekelley1 New Member 0 Rep 13 Posts Drives: 335IS Join Date: May 2018 Location: Seattle, WA iTrader: (0)	Went out this morning, started the car and no knock. However, after hearing up A bit the knock came back, maybe it's just me but it seems louder now.
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02-04-2020, 08:44 AM	#4
feuer Major General 4276 Rep 9,206 Posts Drives: wife crazy! Join Date: Apr 2015 Location: Chicago, IL iTrader: (5)	When engine warms up and oil get hot it will knock more.
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02-04-2020, 10:17 AM	#10
MartinWake Lieutenant 80 Rep 414 Posts Drives: CL55 AMG Join Date: Nov 2018 Location: Miami iTrader: (1) Garage List 2011 BMW 335i [0.00] 2016 BMW 320i [0.00]	No, its not rod knock it does not change with rpm this is rod knock:
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02-04-2020, 04:29 PM	#13
smass Lieutenant Colonel 398 Rep 1,579 Posts Drives: 06 325i - 10 335i Join Date: Sep 2010 Location: Scottsdale, AZ iTrader: (1) Garage List 2010 E90 335i [0.00] 2016 F15 35i [0.00] 2003 E53 3.0 [0.00] 2006 E90 325i [0.00]	As loud as that is, you should be able to figure out what area of the engine it is coming from. Pick up a mechanics stethoscope. https://www.autozone.com/test-scan-a...iece/70131_0_0 Poke around the valve cover, block, exhaust and so on.
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02-05-2020, 06:12 PM	#14
dekelley1 New Member 0 Rep 13 Posts Drives: 335IS Join Date: May 2018 Location: Seattle, WA iTrader: (0)	Got a scope, but when I went to pinpoint the knock went out to check and the knocking is completely gone!! I cant reproduce it at the moment. What the heck could be going on. A rod doesnt just stop knocking all of a sudden.
	Appreciate 0 Quote