Camry :: 2002 XLE 4-cylinder - Inconsistent Knock / Rattle From Engine Compartment
Jun 10, 2011
I own a 2002 Camry XLE 4-cylinder with about 95,000 miles which is in excellent condition and well-maintained. Recently I began to hear a rattle, tapping or knocking sound apparently from the passenger side of the engine compartment (passengers agree with apparent location). It almost sounds like engine knocking, but the times it happens seem to rule that out. It could be some metal vibrating against something, but I can't hear it when I'm under the hood, and nothing appears loose. I've taken it to my trusted independent mechanic, but he couldn't duplicate the sound driving for 15-20 minutes on the freeway or see anything wrong when put on a lift. The sound doesn't occur all the time, of course; that'd be too easy.
The noise begins:
-after I've been driving 15 minutes or more
-after the car gets above 45-50 MPH, but when the noise finally begins, it will then occur down to as low as 30 MPH.
Last weekend I drove 1000 miles roundtrip on the freeway at 65-80 MPH; it didn't begin for 30 minutes, but continued most of the way to my destination (5.5 more hours), though it did seem to stop a few times. This week, my 20 minute drive to work, which has about 10 minutes on the freeway at 65, has not caused the noise to happen once.
Characteristics of the problem:
-the noise is not related to RPM; once it begins, it is about the same frequency and volume at 30 MPH as at 80 MPH
-it doesn't occur when in park or neutral and idling, even if the engine is revved, and even if the noise was just occurring on the freeway moments before
-it doesn't change when running over rough pavement or in turns
-it doesn't change when regular gas is replaced with premium (tried this last week to rule out engine knock, though the lack of RPM affecting it probably ruled that out already).
So it seems like it may be related to the speed of the car and perhaps the temperature of the engine or compartment. The hood latch appears to be holding tight with no play, the strut mounts were replaced 10K ago, and the wheel bearings check out fine.
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For the last couple days I have been hearing a rattle from somewhere in the engine compartment. It happens on low rpm in a very narrow range. For instance, accelerating gently off a stop it would come on and then stop. Sounds like a diesel engine. Happens when the car wasnt fully warmed up and seems to go away after a period of driving. Heat shield?
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There was a TSB for 2AR engine, Engine Knock/Rattle Noise at Cold Startup. My question is for those I4 camry owner, do you have these rattle sound when you start your vehicle at cold? I am not sure if mines have the same issue, but pretty sure is I can't find any differences between mine and this clip:
You Tube
So should I take it to the dealer? Or it's normal?
[URL] .....
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So today I decided to take a drive outside of town and everything was fine until I was going up a hill. The car lost power and the engine started to knock. I was able to get it off the road and shut it down really fast. Decided to check the oil and it was hard to tell where it was at on the dip stick. With the dipstick pulled out I notice that there was steam/smoke coming from the dip stick tube.
After I let it cooled down and waiting for a tow truck to come to the rescue, I tried to start it. It ran for a few seconds and then died. During that time I had no power when pressing the gas and it sounded like it was knocking. It was hard to tell the type of noise it was making. Not one did the oil light, check engine light come on until it stop running.
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Trying to diagnose the below clunk noise as the accelerator is initially pressed?
[URL] ....
If there belt tensioner wobbles like this on a 2azfe? There is a noise as you initially press the accelerator but then disappears. You can hear it in the video. I know there is a tsb on the tensioner but the belt doesn't look like its loosening off.
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2008 Sonata Limited.
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The rattling stops after about 60km/h or so and does not happen at all during cruising otherwise.
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2007 Touareg with 19",V6, with 10,700 miles
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The dealer acknowledge the noise and has tightened all suspension parts, greased all joints, replace front-right shock and bushings (for some reason the noise is more prevalent on Right side), put some sort of tool with sensors in different areas of the chassis to "hear" noise differences while driving to determine the culprit.
Description: To me, the noise sounds like there is something lose in either the engine compartment or the area where the wipers are located. Sort of like if there was something (plastic maybe) hitting the chassis (only at slow speeds - I cannot hear it when driving faster I guess because of engine and road noise). I have not been able to figure it out.
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So I have searched about engine rattle/knock and I have found lots of results for cold starts but I haven't found it for the issue that I am having. I have a 2010 and anytime the battery is real low, around 2 bars and the ICE fires up to charge it, any time I give it a little throttle input, I get heavy valve rattling. It doesn't matter if its cold or hot, it does it as long as the battery is low. I never get this noise when battery is charged up, only when low. I have a link to the video below and you can see once I give it some input, it starts to sound like an old diesel tractor. Prius has close to 200K on the odometer and all my maintenance is up to date. Please turn the speakers up but the noise is right at 5 seconds in or so.
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So I'm at my wits end trying to locate (and fix) a loud, high frequency rattle noise inside the engine compartment.
It can be heard when applying the gas pedal a certain amount. In other words, I can "find" the noise and maintain it at a certain rpm.
The noise is coming from the back of the engine near the firewall. It feels and sounds like it's coming from the throttle body plate and vibrating the gas pedal. I cleaned the plate and it isn't loose.
The issue doesn't seem to be affecting engine performance.
The sound is noticeable while driving (under load). When in park, I can find an rpm where the throttle body seems to take a heavy wave of vibration from the engine and hum (but not nearly as loud as while driving). Issue existed before I put on new motor mounts, and still persists after replacing all 4 (although the vibration and noise are reduced).
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2003 Toyota Camry LE 4 cylinder
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