Cold engine knock

Reply Subscribe

Thread Tools

Search this Thread

Oct 22, 2006 | 05:04 PM

JamRWS6

Thread Starter

Driver

Joined: Feb 2006

Posts: 109

Likes: 0

From: Waco, TX

Cold engine knock

Just got back from Memphis for a weekend trip. Morning temperatures were chilly and I noticed that my RX350 had a knocking sound coming from the engine when I drove it. Noise finally went away when it got up to full operating temperature. Only have 3000 miles on it. It has not been cold enough here in Texas for me to hear this until I made the trip this weekend. Anyone else notice their RX350 with this problem? My RX330 never made this knocking noise when cold.

Oct 22, 2006 | 10:50 PM

Bongos

Rookie

Joined: Oct 2006

Posts: 83

Likes: 0

From: CA

do you use 87 or 91 octane gasoline?

Oct 23, 2006 | 12:07 PM

JamRWS6

Thread Starter

Driver

Joined: Feb 2006

Posts: 109

Likes: 0

From: Waco, TX

Run only premium 93 octane. Knocking only occurs from initial start up until temp guage is near the normal range. Maybe 3 to 4 minutes. It did it again this morning with the outside temp around 45 degrees. Oil level is normal and looks ok. Noise is definitely in the engine and changes with the engine speed. Anyone else heard this from their RX350?

Oct 23, 2006 | 12:38 PM

Spotnsabby

Rookie

Joined: Aug 2006

Posts: 62

Likes: 0

From: GA

Yes, I've heard mine the last few mornings. Time to get it check out!!!

Oct 23, 2006 | 01:48 PM

Seadee456

Driver

Joined: May 2002

Posts: 180

Likes: 0

From: Dallas, TX

You prob want to get it checked out. It was cold this morning but my car ran fine. I keep mine in the garage so it warmer in there. I know there is no Lexus dealer in Waco so that may be a problem. If you want to pay, my ex-girlfriend in college took her Lexus to Jeff Hunter Toyota or that import place off Franklin and they did a good job.

Oct 23, 2006 | 02:02 PM

JamRWS6

Thread Starter

Driver

Joined: Feb 2006

Posts: 109

Likes: 0

From: Waco, TX

Looks like I will have Sewell look at it when we do the 5000 service. Interesting that at Spotnsabby has heard it as well. Makes me wonder if it may be more widespread.

Oct 23, 2006 | 03:37 PM

thorpe

Driver School Candidate

Joined: Aug 2006

Posts: 4

Likes: 0

From: wa

Cold Engine Knock

I was hoping I was not the only one. Somebody else can back my claim. I took in my 07 Rx350 for this exact problem. During cold startup there is a knock/pinging/diesel engine type sound when the car starts up. Sounds like a sticky valve or a rod. After the car is warmed up the sound goes away. My dealership has opened up a ticket with Lexus/Toyota on this issue. We test drove brand new rx350's to reproduce the sound. Guess what. They all make that noise when cold. Dealer thought of numerous situations as to why the new 3.5l engine would make that noise. Possibly the new oil viscosity? All I know is that I do not expect that from a 40k car. Let's start a official Engine knocking thread. The more people we can't hunt down the faster this get's fixed.

Last edited by thorpe; Oct 23, 2006 at 03:40 PM.