Prius (Gen 3) :: Loud Rattling Sound From Engine At Start-up
Nov 10, 2013
I recently had my oil changed at Toyota dealership at 11,700 miles. Picked it up after 2 days and upon starting heard a very loud rattling sound from engine; as if it were going to drop right out of the car. Shut it off and re-started ok, but very concerned. No repeat of incident until this morning. Same sound at start-up (now at 12,600 miles). My daughter who was inside the house could hear the noise. I used the car the previous day, parked outside in driveway as usual. Now very very concerned.
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i started my '04 prius (~110k miles) this morning, went back into the house to grab a few things, & then I started hearing a loud rattling sound from the engine for a few seconds before the engine died.
The dash and MFD lite up with these symbols in the attached images.
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Upon starting, my 2002 (160,000) has a rattling sound coming from the passenger-engine side. I just started noticing it and it seems to happen in the morning on its first start up. It doesn't seem to be effecting driving, but not sure if it was something to be concerned about.
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Problem description: A loud metallic rattling sound from under the car under moderate to heavy engine load, only when engine/exhaust is/are cold. It is noticeable from within the cabin with the windows rolled up and the sunroof closed. Crack a window or the sunroof and it's pretty loud. The first time I heard I, I thought "this is not good".
This is not an octane ping or valve train noise. It sounds like a coffee can with marbles being shaken in concert which what might be the rapping of a V8 engine's exhaust. I had a Sunbeam Tiger that rapped in the upper rpm ranges and this reminded me of that but instead of rapping, it shakes a can with marbles.
There has been much discussion and speculation as to what causes this. It does seem to occur only with late - 04 and up V8 Touaregs with the "sport" exhaust that replaced the "std"(?) exhaust used on the majority of the 04s.
Observation: I looked very closely at the heat shields, looking for ways they could rattle. On the passenger side (LHD), the heat shield has three main sections:
- Front: around/near the secondary cat (tightly secured)
- Rear: around/near the rear differential (tightly secured)
- Middle: between the two mentioned above (loosely secured)
The three sections overlap a little where they meet. It was very easy to tap on the middle shield and make a loud metallic sound. I put my finger between the two shields (where they meet) to isolate the two metal pieces and tapped again, and the noise was gone.
Theory: The harmonic resonance of the exhaust under load vibrates the middle heat shield and it rattles against the front and/or rear shields. As the shields heat up, they flex enough to provide clearance between each other and the noise goes away. This may be unique to the "sport" exhaust if (and I am only speculating) the heat shields were changed (in design or fitment) when they changed the exhaust.
Experiment: I tried a very simple experiment. I slightly bent the edges of the middle shield (~1/2 inch) where it was coming in contact with the front and rear shields. The allowed me to tap rather hard on any of the shields without them rattling against each other.
Result: I make the tweaks to the shields Sunday night. When I drove to work this morning, I put the transmission in sport mode and ran WOT until it shifted. Normally, I would have heard the sound (very loudly) but it was gone. No metallic sound. Not completely convinced, I repeated the experiment on the way home and, again, the sound was gone.
Summary: It was cool out when I was going to, and from, work (64F) and this would normally be the perfect set up for making the sound. I think that tweaking the heat shield has solved the noise on my Touareg. I am tempted to go back under there and pop-rivet a little brace between the shields so that they cannot rattle against each other again. On the other hand, I may just leave it be and do the pop-rivets if the noise comes back.
Anyway, I was excited to find a potential solution for my Touareg and wanted to share it will you all. I will post back after a while and report how it goes in the long term. Lastly, I really liked being able to put the air suspension in xtra-offroad and get under the car (easily) without using a jack....
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I got in the car today and started it... I was waiting a few seconds for someone to get in the car (it was in the garage) and as soon as the engine kicked on there was a very very large long rattle noise i immediately turned the car off. Waited again and turned it on same noise.. the only thing I found was a cover under the car towards the front was really loose. ( I haven't hit bottom or anything while driving) but I did have the lighted door sills just installed the other day. But it never made that noise..
btw i have 1100 miles on it..I looked under it and is the black dust protector thing supposed to be loose like if I push on it I can make it rattle..
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I have 2012 aqua and it has done 12,000 KM on it. When I press the throttle further, the ICE kicks in and there is a kind of rattling sound coming from ICE at times (not Rev up sound). However, when the car is in idle , the ICE kicks in to charge the battery and that time I hear only engine Rev up sound and not a rattle.
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I have just purchased my first Toyota. Formally a Subaru man. It is a 2009 corolla XLE with 95,000 miles. It is a one owner car in excellent condition and I have all the service records from the Toyota dealer where the work was done.
When I start the car most of the time there is a rattling sound that comes from the engine compartment and lasts just a couple of seconds. In my manual there is something in the ABS section about noises from the ABS system. Could the ABS system be the cause of this noise?
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When accelerating up a steep grade the engine will ping (rattling metallic sound) when reaching a certain RPM, but stop pinging as I continue to push the accelerator down and increase the RPM. Should I be concerned? Could it be something else, loose exhaust heat shield or something? Or is this normal behavior for a gasoline engine? My old Honda Fit never had engine ping/knock that i can recall in its 200,000km of service running the same 87 octane gas.
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I just recently purchased a 2006 Avalon Touring. Its been a week now and there has been a loud rattling sound in the rear end of the car. It begins to sound on low RPM, but as soon as i hit high velocity, the loud rattling goes away. Note, sometimes the whole car feels like it would shift to the right; when making a left or right turn. Little scary feels like it's about to flip over.
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So im trying to diagnose my girlfriends issue with her car. When she starts it, the car will make a very loud rattling sound, not really grinding, but like metal on metal contact. Sometimes the sound goes away, but when the car is cold it is a guarantee. The battery light is also on, which was not the case when the rattle first started. I first thought (and hoped) it was perhaps the serpentine belt tensioner as I researched that when it fails it can make a loud rattle sound.
Once replaced, the same issues occurred. So I went ahead and put the old one back on since it was not the issue. Note that the old one and new one both shared the same tension applied to the belt and the pulley was still smooth without issues.
Using a stethoscope to try to determine the location of the rattle a bit more precisely I found the noise to be coming more from the alternator. Weird because I recently replaced it within the last year. I went ahead and removed the tension from the belt and played with the alternator for a bit. The clutch felt good when i used a screw driver to hold the fan and tried to move the pulley. One direction moved with ease while the other direction refused to budge, perfectly normal as I researched. The thing that I noticed that I thought was unusual was the fact that the shaft of the alternator had some play (Video below).
The belt has plenty of tension on it so i do not believe that it is slipping on the alternator. I push the belt with the tensioner engaged and the tensioner does not budge.
I decided to measure the voltage coming off the alternator with the car running and it was at 10.95 which im pretty sure is very low for these cars.
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I've a loud squeaking sound coming from the front of the engine on cold start. This only happens when I start the engine after overnight parking . There are no squeaks when the engine is warmed up or when I start up with a warm engine.
I'm driving an 07 Camry and live in a region with hot tropical weather.
Video link to the sound [URL] ....
What could be the probable cause of the this and how do I rectify it?
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My 2001 Prius makes this sound when the engine is running. All the battery lights are on all the time, I think it needs a new HV battery but I'm not sure if it's worth it. Perhaps the other battery is faulty I really don't know. All the engine lights are on and if the brake light comes on it starts shaking or the power steering fails or it just completely shuts off on the road no lights no power steering nothing. When that happens I use a battery booster that I keep in my trunk to get it going again but it's really dangerous to drive now.
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My 1998 Volvo V70R with only 53,000 miles (I'm the original owner) has picked up a problem. It started a year ago and seems to occur only when I do not let the car warm up for a few or several minutes: once I put the car into drive and start to move -- no matter how slowly -- a loud, high speed whirring sound begins. It will last for a minute or two and then stop. The speed of the whirring is constant and is not affected by how fast I drive or even if I come to a stop. It happens in both cold and hot temperatures. The whirring does not occur if I start the car and just let it idle and warm up. The loudness of the sound is such that it can be distracting to pedestrians 40 feet away. Changing the oil hasn't worked. More recently, the noise sometimes reoccurs in the middle of a drive. It always occurs when I start the car after it's been sitting for a few hours or more.
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Was driving down the highway when I heard a loud explosion.
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Our 46K mile 2012 Tiguan starting making some pretty loud whining/growling/rattling engine noises recently so I took it to the dealer shop and they diagnosed a bad accessory belt tensioner. However, they didn't have one in stock and would have to order it. Well, that's fine but it's a 300 mile round trip to the dealer so I came home and ordered one from ECS Tuning.
I found a copy of an official VW (ETKA?) procedure on the web for replacing the tensioner for the TSI in a Golf so I suspect the procedure for a Tiguan is similar: remove the bolt for the secondary water pump and move the pump out of the way, remove the end bolt on the tensioner mounting shaft, remove the three bolts from the pendulum/dogbone, support the engine, remove the top two bolts from the passenger side engine mount, drop the engine about 2 inches and pull the tensioner out.
To be honest, I was very surprised that the dealership didn't have a tensioner in stock. This was a rather large and pretty good dealership shop (three service advisors). I guess accessory tensioner failure is really rare on the TSI.
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Fiance's 09 Corolla S just started having a rattle/knock noise this evening. car has 123k. It's clearly an engine internal sound. I believe it is coming from the cylinder head. She called me when it started making the noise, she shut it off and has only been ran enough to get it on and off the trailer.
Not sure if it's a broken valve spring or valve. or the timing chain guides? It threw a CEL light.
I ran the code on my scanner and it came back with: P0302 (Cylinder 2 Misfire)
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I drive a 1998 Civic hatchback. Last night while I was driving I needed some gas. I pulled into a station and the only gas they had available was 93 (highest octane). I only ever fill up with 87 or whatever the lowest grade is, so I put 2 gallons in to get me to my destination and the opportunity to find another gas station. Shortly after, I was back on the highway and the engine starts making a loud rattling pinging noise when I step on the gas. I normally might have a low rattle or ping that I've never been able to get rid of, but never loud like this.
Then a few things happened– smoke starts coming out the exhaust, the check engine light comes on, and the car starts to overheat. Seems like it was pretty much all at once, although it was in that order that I noticed... I rolled the windows down and turn the heat on high, but the air coming through the system wasn't at all hot. I got off the highway and as I downshifted, the engine started to smoke a little. I get to the end of the off-ramp and the engine dies. It wouldn't start back up right away but I managed to start it a couple of times (between it dying) to get it to coast into a parking lot. Under the hood, there was coolant everywhere it seemed, but I couldn't see anything else apparently wrong– hoses, etc.
In the end I had AAA tow it home. So, what happened and what I'm looking at now in terms of repairs? I will need to have it towed again to a mechanic if it is something I can't figure out myself.
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I recently purchased a 2006 Hyundai Azera which has developed a rattling sound upon cold start up. Based on service bulletin 06-20-002 I believe the issue is with the timing chain tensioners. I am looking at getting a DNJ TK147 timing set kit to replace them with. Do this kit contains the updated tensioners? It is located on rockauto.
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As the title says I have noticed a strange sound on start up in the last couple weeks that sounds like rocks in a can. Noticed only at start up and then stops but I have noticed it slightly infrequently when driving. Truck runs great, no noticeable problems. I have looked under the hood and suspension to see if something maybe hung up and didn't see anything. Thought this might be the problem since I was following a plumbing truck that had plastic buckets flying out the back and I hit one!
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I have a 2015 IS350 F-Sport. While accelerating, the engine sounds fine, but it sounds aweful when idling. Don't know how else to describe it other than like a rattling sound...it's just not smooth. Is this "normal" or should i schedule a service appt for my car?
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I have a 12 day old Hyundai Accent 2012. I got the GL automatic transmission with a 1.4L engine.
I noticed a rattling sound inside the engine bay after a week of using the new ACCENT. It rattles when the engine is at medium effort. Usually i hear this kind of rattling sound with my 20 year old Mazda, but with a 12 day old car? WHAT?!
Got it serviced with Hyundai but they think it's the unleaded gasoline that's causing it, but they don't recommend using the high octane one. Talking with the technicians there, a lot of 2012 Accent owners already came back to the shop to complain about their rattling sound in the engine bay and i was not the worse sounding one.
I will record my rattling sound tonight by placing a small microphone inside the engine bay and post it youtube.
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