Engine knock at cold startup - RX450H

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Mar 2, 2022 | 06:17 PM

#31

dougash

Driver School Candidate

Joined: Mar 2022

Posts: 2

Likes: 0

From: VA

For me, that 'knocking' noise was a precursor to a pressurized oil pump line bursting. The line had actually started leaking (not a lot at first, but increasing until I finally learned what it was), but I could never see any dripping under the car so I didn't realize it was leaking. Apparently that hose is something of an achilles heal issue for the RX. Anyway, once the leak increased and I kept seeing my oil level go down, I took it back to dealer and they found the leak. Once replaced, the knocking went away...

Apr 8, 2025 | 10:29 AM

#32

Xennial

Rookie

Joined: Mar 2020

Posts: 28

Likes: 0

From: UT

This might be the issue.

Apr 12, 2025 | 06:58 AM

#33

Clutchless

CL Community Team

Joined: May 2005

Posts: 7,230

Likes: 1,746

From: VA

See this potential fix that you can DIY if handy.

Apr 12, 2025 | 10:25 AM

#34

Xennial

Rookie

Joined: Mar 2020

Posts: 28

Likes: 0

From: UT

Quote:

Originally Posted by Clutchless

See this potential fix that you can DIY if handy.
https://www.youtube.com/watch?v=LfsIsMP9dHQ&t=1s

Yeah, I saw this video already. I don't know if I am handy enough to take all the wiper blade stuff off, and remove everything to access the valve covers.