For the past month or so, my RX has been making this weird vibration and noise from the under body near the engine (maybe transfer case?) It is usually when it's cold and at low speed. But sometimes it does it even when the engine's warmed up for couple minutes.
I did change the transfer case fluid and rear differential about 3 months ago. Not sure if this is related.
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).
I recently got the timing belt along with water pump replaced. While they were in there, they changed the spark plugs and intake gaskets. I also had a leak in the radiator so that needed to be replaced. The car has 97K and is a 2008 400h. Local ex-BMW mechanic shop did the work. I supplied all the parts, and he only charged me for labor.
Car runs super smooth now with the replaced plugs and we have been euphoric with the maintenance to date until very recently.
So 1500 or so miles since this major service. My wife and I have been noticing that under load typically on an incline/hill there is some noise coming from the engine. I heard it again the other day and were only noticeable at low speeds between 10-35 MPH and low RPM. (I couldn't tell you exactly the RPM's as its not provided in the instrument cluster.) It seems like the engine is struggling a bit and is rattling at the top near the back of the engine bay/ fire wall area. Maybe its the intake manifold housing? Its hard to reproduce too. Once I give it some gas it goes away. It only seems to happen once on every trip and only on hills/grades at low speed.
Going from being an even quieter and smoother running vehicle after the service to this is making me a little concerned.
In 2010 i purchased a 2005 Lexus GX470 w/ 52k miles. It had 2 previous owners and you could tell it had been garage keep and most likely not their weekday car because low miles and 3rd row was in mint condition. Up until late last year the car has been great. I use it to tow my boat and the only thing besides regular oil/filters and its 60k checkup was to replace the drive shaft for the TSB/clunk noise on stopping.
I am currently having two issues that have been becoming worse.
1st is the knocking or tapping noise in the engine compartment. Below is a link to the video. This was after driving for approx 15 minutes. It doesn't do it 10/10 times, but is probably happening 1/2 the time now when i drive it. Oil is 10W30 Full Synthetic by MobileOne and just replaced today to see if that changed anything. I purchased 2 replacement knock sensors a few weeks back but haven't had the time to break it down to swap them out. Figured since the belt needs to be done at 90k and my car is 10yrs old I might as well replace the timing belts at the same time. When the AC is on or car is in drive it doesn't knock strangely enough. In the video you can hear the AC click on/off and knock when its off. I'm hoping this isn't a bad engine or rod or something... Thoughts?
2nd is the steering vibration. I noticed there is a TSB on that for replacing the steering column and other parts and assume I should do thing soon as well. Depending on the payment or temperature it will do this at times around 60ish MPH. Again, its not consistent, but is very noticeably while driving when it is. Tires have approx 40% tread remaining and only the driver side tire seems slightly more worn on the inside than the outside.
When I go over bumpy roads I get car noise. Seems worse than 6 mos ago. Maybe I'm imagining it. The noises are diffuse and somewhat varied, not limited to a single area. And varies in intensity with the bumps.
Anyway, I tried testing for bad shocks by pushing down the front and back of my 2004 Honda Pilot and watching the return. But I didn't observe much. I couldn't get much vertical distance on the push down, to begin with.
Incidentally, there's no instability while driving...no up and down bouncing, no lateral movement, no problem when braking or starting.
So I started hearing a noise that sounded like a telegraph clicking in random intervals. Some days, no sound while others I thought I was an old Western Union Office. Now the sound has progressed into a sound that almost sounds like a small compressor. It sounds at each start up and then at different points during the drive. I have traced it back to this device. It sits to the left of the Air return behind the glovebox. I have two pics to illustrate. It is the black box with a small wiring harness plugges into the top. On the left side there is a cylindrical white piece that is part of this device. Everything in my car works so not sure what this thing does. It looks like a royal pain to get out as one of the bracket screws is down in the back so that screw will be tough to get to without dropping the blower housing. That may require pulling more things like the dash when they replaced the evaprator.
View 5 RepliesI have a 2008 RX350 with 68k on the clock. Received a check engine light for random misfire (P0300) and misfire on Cylinder 4 (P0304), Cylinder ,5 (P0305) ,Cylinder 6 (P0306). Question is what will be causing this to happen. I thought about changing the spark plugs to see if this is possibly the cause. but what else should i be checking?
View 1 RepliesMy '05 Lexus RX330 has developed a vibration and rattling noise, that I believe comes from the exhaust system. Looking for info on trouble shooting or quick repair?
View 10 RepliesI recently hit 180,000 km on my mileage and all of the sudden theres increased ticking engine noise and vibration. Sounds like a diesel engine. No check engine lights, gas mileage is the same, acceleration is the same and as far as I can tell after checking oil its within normal range for now.
I'm worried its either the VVTi Rubber hose exploded or its the VVTI Camshaft / piston slap issue. My dilemna is I'm 3 hours drive away from a Lexus dealer but there is a Toyota Dealer 10 min away. Should I bring it in to verify theres no oil leak at Toyota and then take it back to a Lexus mechanic to see if it is Camshaft gear ?
My car is Lexus Rx 400h, 2008, AWD, European version.
Looking for installing this chrome "molding" under the doors?
I went to remove the license plate screw head broke off because of rust.
what I can do to remove the screw body.
I have a 2004 GX470; bought it new. The last few months I have been hearing a strange noise from the driver's side; seems to be coming from under the floorboard and can sometimes feel a vibration in the brake pedal. The noise is similar to a cat meowing. Have a son who is a GM tech; he said it sounds more electrical than mechanical. It happens mostly when I drive it cold. Seems to also happen more when turning/braking. I had the main belt replaced this summer. Should I have the tension pully replaced?
View 12 RepliesI went to clean my wife's throttle body out with brake cleaner and I think I sprayed too much into the throttle body now the car won't start. It makes a small clicking/grinding noise when I try to start it. What have I done?
View 12 RepliesI've tried searching everywhere, but can't seem to find the torque for the 4 bolts holding the throttle body to the plastic intake. This is on a 2az-fe engine in my 2004 camry. I imagine the torque would be the same for any Scion, RAV4, etc. that has the same engine.
View 4 RepliesI own a 2004 Hyundai Sonata (2004 Base model L4 - 2.4L 2351cc - MFI GAS DOHC) which is a 4 cylinder and has about 113000 miles. Anyways, about a month ago we had one of our coldest days of the year. I drove the car to work and everything was fine. Then when I left work (it was freezing cold) I went to start the car and it sounded like I started a race car. It was so loud that I thought the car was going to blow up (no check engine light came on). I changed the oil and that didn't work and so I figured it was something with the exhaust.
Then I took it to my mechanic (applause). He said that he was stumped, the car was noisy but he didn't think it was a problem but he said he would try to figure it out. He ended up taking off the timing belt and said that was fine, he said the water pump was good as well. He had a service tech look at it with him and they thought the issue might be the "vibration dampener" or "damper" So they replaced that but it didn't work. He said it could possibly be the motor mounts but he said when he looked at them they looked okay?
I drove it off his lot yesterday and it is quiet when I idle but I can see the steering wheel shaking significantly. Then when I hit the gas it is still obnoxiously loud and with heavy vibration! But when going down a hill and letting off the gas there is a brief respite of silence (still vibration). It is especially louder in lower rpms and sometimes I think I can hear a metallic clanking/scraping noise when I have the times of "silence" but it is very faint.
Over the last few months I was having a problem with my 2002 SC430 with 130,000 miles having random hiccups and engine hitches during acceleration and even at random times while on the highway or around town. My average 10 minute trip around town would have at least 10 hiccups, all random and during no specific style of driving. No one wants a stuttering engine!
After reading some of the threads here there were several options...
1. Do a system reset by using only the key turned on and pressing on the gas pedal for thirty seconds. While optimistic, this didn't solve the problem...
2. Many threads suggested that it may be my TPS (throttle position sensor) so I started shopping around for a sensor to install myself. They run for about $75 online and are a pretty easy install..but I wanted an official opinion so I went into my local lexus dealership to ask them if this was the best course of action...
The solution: Apparently, the 430 engine is a notorious carbon producing engine so, as my local lexus mechanic explained, this carbon can build up in the throttle body, affecting how the mass air flow sensor (MAFS) is read. My mechanic recommended having a FUEL INJECTION SERVICE. This service cleans the fuel deposits in fuel injectors and carbon build-up in cylinder heads and in the throttle body plating.
I have a 2011 Hyundai sonata and my steering wheel and body of vehicle vibrate either when I'm in idle or when I stop at a red light and once I let go of the brake and accelerate It stops. What can I do?
View 3 RepliesI have a 09 RX350 and noticed this light (just a red car, like the open door light but without any door) as seen in picture that came on randomly during driving but disappeared itself shortly. It happened about 2-3 times in the last few days. I cannot find what light is for in the owner's manual.
View 4 RepliesFirst: 2007 GX470 with 63k miles
On some 'cold' starts (and I use that term very loosely, because it never really drops below 40 degrees here), when the engine has sat overnight, and when I shift into reverse (never Drive, just Reverse) and stand on the brake I get a knock. I don't hear it in Park. Not valve clatter like on my german cars while the oil gets routed to the lifters, but instead a loud, startling deep-down knock that sounds like BAMBAMBAMBAMBAM. Then it goes away. Put it in neutral and the revs rise and it's gone. Put it in Drive and nothing there. Just lasts for maybe 5-10 seconds, but is it loud. BAMBAMBAMBAM! Like someone hitting a 2x4 on the block or tranny housing.
Once I'm past that 5-10 seconds it won't do it again all day. Just after a "cold soak". And perhaps 5-10% of the time.
There is a lot of examples with this motor of what some call "piston slap". Don't know if I have it - and I suppose it might get worse (to the point where I hear it) when the engine is cold and under load (in gear), but I don't get it in Drive. Just Reverse.
It all started after I refueled at Mobil after a rainstorm a month ago. Could be coincidence, but right after that the car started jerking wildly and making a howling wind noise from the front. Thought it was the transmission. Brought to Lexus dealership, they told me nothing was wrong as I had low mileage on the car. There are NO Check Engine lights on the dashboard. Car "quieted down" after that, but the noise remains EXCEPT at high speed when it's quiet.
In addition to that, the jerking / misfiring continues at stops, reversing, and slower speeds on occasion only.
I tried Techron FI cleaner, but it has not made a difference. Filled up several times since then.
What's wrong?
I have a 2006 Camry LE 4 cyl. that developed a light, random (metal sounding) rattling noise under the hood, near engine on passenger side. It's present/noticable at idle and slow speed.
Car runs great otherwise and great gas mileage, pushing around 100k on odometer. Out of town with car otherwise would have looked at. Could something just be loose? Something in air filter? GF drove it down to FL and was fine before she left.