Lexus GX 2010+ :: 2014 - Engine Knock When Cold
Mar 27, 2014
I finally made a recording (attached), I would suggest listening to it with headphones if possible. The noise I'm referring to is featured between the 0:28 and 1:00 marks. You can hear it again from about 1:10 to 1:25.
Just to recap:
2014 GX Premium pkg.
4400 miles
93 Octane always
The sequence of events is such:
1- Car is parked overnight in garage, air temperature is 60 degrees or less
2- Start car, pull out of garage
3- Put car in D
4- Drive to stop sign at end of street
5- The transmission downshifts and engine revs slightly as the car comes to a stop
6- After sitting at the stop for a few seconds, foot on brake, engine at idle, it starts to make that thumping/clunk noise
7- Noise stops once I start moving again, and does not come back once the engine is warmed up
Note: This happens whenever the temperature is 60 degrees or below and the engine is cold/car has been sitting overnight. All accessory systems were shut off for this recording/demonstration (no A/C or heat running, no radio or other accessories on).
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It almost sounds like somebody is taking a small hammer and banging at the plastic cover on top the engine when the vehicle is started new from cold. After about 8 or 9 knocks it goes away.
Taking it to a dealer soon to get it checked.
2010 Model year. 81k miles.
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I recently bought a 2011 460 L, CPO with 28,350 miles. I love the looks and how it drives, smooth! But I do have a concern. Before I go to the dealer I thought I would educate myself from the experienced LS owners. I am hearing a very brief (1-2 seconds) mild engine knock at a cold startup.
This only occurs when the engine is cold and has sat overnight. It never happens after this first startup, even after turning the engine off and then on again. It kinda sounds like the oil isn't getting where it should be for a few seconds. Engine sounds great with normal and hard acceleration throughout the day. The dealership where I bought it is 300 miles away, so I would be taking it to a local dealership.
Now I did hear this noise and mentioned it to the service manager when I first bought the car, and the service manager told me that this cold startup sound is normal. He also mentioned the direct injectors at idle. I guess sometimes it's hard to fully trust what dealerships say. Is he right?
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So this is the second winter I've had my GX (a 2014 purchased in Nov. 2013).
With radio and other accessories turned off, there is a rattling/grating sound that is quite pronounced at/near idle, especially when cold. Sounds like a rapid PRAPP-PRAPP-PRAPP. This occurs when the vehicle is in Drive, but stopped. Occurs most often at within the first 5 minutes of operation....i.e. leaving the house or office, driving to the end of the street, hearing it at a stoplight or stopsign.
I've posted videos/recordings of it previously, which I have also shown to the dealer. The dealer said they could sort of reproduce, but could not diagnose it. I have tried to crane myself outside of the GX to listen to it, but from outside nothing seems to be amiss.
At first I was worried that it was engine knock/the car eating itself, but if that noise was representative of that, I think the car would be blowing smoke or dead by now. I have not noticed smoke, adverse effect on fuel economy or the noise at speed/under load, as you would expect if the engine were truly knocking. So I'm thinking it may be a fan, some type of underhood accessory, etc. that is the culprit. Sounds almost like a plastic component (fan, pulley, etc.) could be off kilter?? Something that more or less goes away after the engine has fully warmed up and the car has been driven for 10 mins or so.
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The tranny is a bit rough when the engine is cold. I understand cars run differently when they are cold (I'm not disputing that) but my prev 2IS' tranny use to be much smoother when running cold. I took my car to a dealer, made them keep it overnight and test when cold. They said the car is operating normal and the master tech didn't notice anything out of the norm. The car is jerky on the daily so it's not an isolated incident.
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Paranoid about my car. Basically what happened was after work I walked to my car and there were a bunch of guys who were meeting up in the parking lot and were complementing me on the car . I always let the car idle until RPM reaches 1,000 and I did that today and as I was driving off I decided to show off a little and I floored it . just for about 2-3 seconds. it was about 70 degrees out and the car was sitting in the sun so the engine shouldn't have been to cold
I know it is bad to floor a car on a cold engine, so my question is how bad could I have potentially damaged my engine? it was sitting for about 3 minutes and RPM idled out to 1 but the hot/cold bar hadn't risen yet. it was the first time I did it on a cold engine and I bought the car so I want to do whats right to keep it running smoothly.
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Recently, my CEL came on. I had the guys at Autozone read the code and they said it was the knock sensor on bank 2. I disconnected the battery to clear it but after 100 miles or so it came back on. Idling, my engine runs as quietly as it ever has (can't tell it's running if the windows are up) so I'm hoping that the sensor has gone bad. I can't hear any knock at any speed but the re-appearance of the light has noticeably affected the engine performance. Any link that even shows where the sensor is located? If I can find it, I can replace it.
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First: 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.
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My 2011 Camry LE I4 with 21k miles has a slight knock after cold startup, at Idle for a few minutes that disappears after warming up. If you start and drive and don't let it warm up the knock, under load, is more pronounced.
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I have a 2006 Corolla LE with about 93,600 miles.
It was about 16 degrees Fahrenheit this morning and I drove on a cold start, and noticed the engine knock a bit when idling. Later noticed check engine light come on. After the car fully warmed up, 15 minutes later, the knocking seemed to subside.
I don't think I've replaced the spark plugs in the longest time, so could it be this issue?
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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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I have a 2003 Mitsubishi Diamante that I have owned since 2008 purchased it with 60,000 miles on it. Currently has 131,000 miles. I have always kept my car in good running condition and performed all of the scheduled maintenance per the owners manual. Last month I noticed a slight cold knock on the right side of the engine that would go away when the engine warmed up. I checked the oil and noticed that it was a little bit low (maybe half a cm below the lower threshold on the dip stick). I added oil and continued to drive it, still knocking.
Bought some sea foam thinking it was the lifters and sprayed a can in the intake and poured some in the oil. Then changed oil with 5w-30 synthetic, have been driving it for about 500 miles now and the cold knock seems to be getting worse and I can faintly smell burning oil when it is idling as I let it warm up before driving off. By the time I get to work the knock is essentially gone. My oil levels have been fine... My question is, should I be explaining to my wife and fiscally responsible self, that I need to be looking for a new (read used) truck sooner than I had initially planned? Or, is this something that can/should be addressed or just drive it until it gives out...
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Specs: 2003 Ranger Edge / 3.0 V6 / 5-speed 4WD / 238,000 miles
Yesterday my truck was in the shop for repair. Intake gasket, Transmission fluid change, all heater hoses, thermostat, serp belt and coolant flush. When I picked it up from the shop, which was after closing, I noticed a knocking on start up. From past experience on a different truck, it sounds like a cam that isn't oiling. After a few minutes the knock goes away. I drove for a few miles, turned off the engine and started it back up and no knock this time. This morning I started it, knock was back but went away after a few minutes. Oil was changed about 1500 miles ago. Running pennzoil 5/20 with a K&N filter. Up until yesterday the engine has been completely quiet. Was wonder if something may have clogged the filter or the drain back valve.
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I have 900 miles on my new 2014 GX460 (bought in Sept) and engine light popped on. Told by Lexus that EGR valve needed to be replaced. It was defective. They said that they heard a whole lot was shipped bad and put on trucks. I guess I was one of the lucky ones. Should I be concerned about the longevity of my new truck now? Easy replacement? Could there be other issues? Has there really ever been a Lexus Lemon? I had a 2007 GX470 that hummed along wonderfully for years, so now worried.
Second question - at what RPM does your GX460 idle at while in gear? After getting it back, it seems to be idling low, but Lexus tells me it is computer configured and even if they wanted to tweak it they couldn't.
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I just purchased a 2010 RX 350, has only 7k miles on it. Really, really nice car. I noticed for the first time yesterday the engine ticking/knocking/rattling/whatever you want to call it sound when starting up on a cold start. It definitely goes away after about 5-10 minutes of running.
Most people seem to accept this as "normal". They hear it, live with it, and they never have any problems. I am a new Lexus owner, so I have trouble digesting that such a luxury vehicle with so few miles would have a "normal" engine knocking sound at 7,000 miles.
A few people posted in other places that this is indeed an issue, and should not be happening. There is a a Toyota (Lexus) service bulletin that I didn't get the details on, it is LSB-0028-09. LEXUS: ENGINE TICKING NOISE AND/OR MIL ON P0014, P0015, P0024, P0025, P0017, OR P0018. ENGINE MECHANICAL. *PE
Looking for details on this service bulletin, and if it does indeed apply to the engine knocking sound.
- Premium gas
- High viscosity cold synthetic oil
- Dealer fixes issue
- Other fix?
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I bought a certified used 2014 GX460 with 16K. I now have 20k. Last week while on vacation, 450 miles away from home, while on a stop light the engine just stopped. I re cranked pulled into Drive and it stopped again. I wanted a couple of mins and it re started. I pulled to a safe area and called my service adviser. He said to keep driving it. Probably just a fluke.
It drove good for the next 45 mins. Later same day we took off again in it. It stopped on me 6 more times. Some were while I was travelling at 60 mph. It just stopped. Had to pull to the side of the road before I lost all steering ability. Kind of scary when a 18 wheeler is on your bumper.
I had it towed to the dealership. They kept if for 5 days. They said they replaced some gaskets around the exhaust valves??? Not areal good explanation.
I drove it 1 1/2 days (45 miles) and it started doing this again. It is at the deal ship now.
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I recently started noticing that my engine sounds louder and rougher than usual. I have a 2014 GX with about 25K on it. I get about 800-900rpm on idle and about 1800-1900 when cruising 70-75 mph.
Engine sounding louder all of a sudden. No "check engine" sign pops up. I also took the car to the dealer and mechanic rode with me on surface streets and of course , everything looked normal to him.
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I once experienced the noisy engine start up.. It sounded like the engine was trying to run backwards or severe pre-ignition.
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What is this metal on metal noise...you hear it the best around the 7-12 second mark...it is especially loud on cold start in the morning when you put the car in "drive" but don't move the car forward. It also is prevalent on hot days when you park the car outside and just start the car. The sound gets louder when you turn on the a/c during the hot day.
2010 2011 lexus engine noise metal noise - YouTube...
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Temperature outside (weather data): 55F. Temperature gauge in prius: 57F. It felt more like 70F. It's a 2010 Prius III model that is 6 months old and has about 3942 miles and is driven VERY carefully.
I start the Prius and when the ICE engages to warm up. There's LOUD intense engine knock. I immediately turn the power off. After a couple of seconds, I start it again....the ICE engages again and then starts knocking rapidly (it is definitely knocking) and after 10 seconds. It goes back to normal. It was so intense that it may have damaged other components or the engine block itself.
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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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