Rattling noise on 2003 RX 300 at cold start only?

25

Asked by Aug 06, 2013 at 03:23 PM about the 2003 Lexus RX 300 Base AWD

Question type: Maintenance & Repair

Here is a video I took of the noise when starting cold - FYI by cold start I mean every
morning regardless of temperature. Has 128k miles, was told timing belt was changed
and mechanic confirmed it before I bought it. Any idea what is causing this and how
serious it is? Only for a few seconds and then goes away.

Video: http://youtu.be/gTjHUYku210

7 Answers

6,845

Do you run a thicker oil in the car now that it has 128K miles on it ? First check for any codes and check the oil in the A/C compressor. At the next oil change, try running a thinner oil in the engine. I have had this happen before were the new oil is too "thick" (viscosity and/or temperature wise), so it takes a while for the old worn oil pump to get the "new" oil thru the system. If it was a heat shield rattle it would not go away until the exhaust was heated up after driving for a few minutes. The fact that the noise goes away so quickly, leads me to believe it is "Lack of lubrication based noise" and that would lead me to check "engine oil, steering pump oil, A/C Compressor oil" levels and viscosity.

4 out of 4 people think this is helpful.

sounds like gasoline is laying awash the cylinders...you know the fuel rail will pressurize whenever the "on" position is on~ if you start it immediately with going from the 'off' position directly to the 'start' position it happens this way too? Thinkin' there is too much gas on startup and takes a minute for oil pressure to start lubricatin'....pull the oil stick and see does it smell of gas? that would seem the way of things~

3 out of 3 people think this is helpful.

Sounds to me like lack of lubrication on top end until the oil pump 'catches up' Too much oil? No. tell me you don't have a Fram on your car, Fram filters restrict oil flow with the cardboard filter element they use.

3 out of 3 people think this is helpful.

your "too much oil" is a good guess...that is gasoline raising the level...we have to find out which component is distributing too much pressure...perhaps the fuel pressure regulator ain't regulatin'~

2 out of 2 people think this is helpful.
25

Thanks for all your answers, gives me a good place to start. Bought the car a month ago and they did the last oil change so I'll have to make sure they use the correct oil, wouldn't doubt they threw 10-40 in there from the big barrel. My mechanic could not find anything wrong when he inspected at the time of purchase, but that was mainly visual inspection. I'll see if there is a gas smell, my "too much oil" comment is because I have a hard time getting a level on the dip stick, seems like oil gets smeared up and down the stick with no clear mark. Car is due for an oil change so I will make sure to bring all these up to my mechanic then. Again thanks for all your feedback, first time here and very impressed.

2 out of 2 people think this is helpful.

you know you could pull the fuel relay while it's runnin' then--- try to start it to see if it IS awash with gasoline....just another diagnostic tip from your friend judge_roy~ (then replace the relay)~

2 out of 2 people think this is helpful.
6,845

If you have a dipstick for your car without any marks on it for a "proper" level indicator, then go buy a new dipstick for the vehicle from a dealer or a local auto parts store (NAPA, O'Rielly, AutoZone, etc.). The cost is cheap and the question of "Is the oil level too low or too high" will never come up again.

Your Answer

Add photo

Related Questions

RX 300

Looking for a Used RX 300 in your area?

CarGurus has 844 nationwide RX 300 listings starting at $495.

ZIP:

Search Lexus RX 300 Questions

Lexus RX 300 Experts

#1 Rx300_21001
Rx300_21001
Reputation 1,800
#2 John Orlando
John Orlando
Reputation 950
#3 mrsvirtuous
mrsvirtuous
Reputation 640
View All

Related Models For Sale

Used Lexus RX 330
48 Great Deals out of 1,524 listings starting at $4,314
Used Toyota Highlander
344 Great Deals out of 25,908 listings starting at $2,900
Used Toyota RAV4
665 Great Deals out of 70,684 listings starting at $2,350
Used Honda CR-V
831 Great Deals out of 60,382 listings starting at $900
Used Acura MDX
241 Great Deals out of 18,697 listings starting at $1,500
Used Lexus ES 300
17 Great Deals out of 959 listings starting at $1,799
Used Toyota Camry
851 Great Deals out of 90,973 listings starting at $249
Used Toyota 4Runner
283 Great Deals out of 20,880 listings starting at $1,995
Used Honda Accord
786 Great Deals out of 88,192 listings starting at $1,150
Used BMW X5
455 Great Deals out of 16,766 listings starting at $2,000
Used Honda Pilot
357 Great Deals out of 21,190 listings starting at $2,199

Used Cars For Sale

2003 Lexus RX 300 Base AWD For Sale
75 listings starting at $2,500
2002 Lexus RX 300 Base AWD For Sale
3 Great Deals out of 145 listings starting at $3,000
2001 Lexus RX 300 Base AWD For Sale
118 listings starting at $2,500
2000 Lexus RX 300 Base AWD For Sale
4 Great Deals out of 142 listings starting at $495