Prius (Gen 3) :: Knocking Or Rattling Sound Comes From Underneath The Hood When Accelerate
Jul 6, 2012
I told them that my car sometimes when I accelerate a knocking or rattling sound comes from underneath the hood. I asked them to check it. I told him it sounded exactly like an older car I had many years ago which was the result of bad gas or too low octane.
With my older car I added higher octane gas (89) and the sound went away. I had a 2011 Prius before and never had this problem and I get gas at the same gas station for years.
So the mechanic test drove my car and said they couldn't find anything wrong with it. So I'm stuck with the annoying rattling/knocking noise when I accelerate (which happens about half the time), but now I'm experiencing another problem.
A couple days later I drove to get dinner. One way it is about 7 miles. Almost the whole way the ICE would not turn off. I would be at stop light, wouldn't turn off. I pulse and glided, when I glided the ICE remained on. Take my foot off the gas at slow speeds, ICE still on.
Finally towards the last 1 or 2 miles it started going into EV when i let the foot off the gas. On the way back it ran normal. It's been close to a week now since I brought it in for service and I only had trouble one other time.
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Since about 5000 km, I have had a knocking metal rattling sound happening when I accelerate up a hill or a slight incline. It has happened a few times on flat road as well just more prevalent on the uphill battles. Now I assumed it was jus something loose that was rattling since I installed a cold air intake and had installed hid lights(I thought the ballast was banging on something). I tried and tried to find the rattle but I had no success. I read up on here about other people suffering the same problem and that running higher octane gas would solve it well I tried 89 and it was still there just not as much and I recently started using 91 and its gone haven't heard it at all.
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I am noticing a sort of clunk or knocking noise from under the hood when I hit the brakes. I thought it might be the pads, but it comes from under the hood .It only makes the sound on the first touch of the brake, once you have your foot on the pedal it stops the noise. It does this every time on the first application of the pedal. Is this sound normal? I don't recall hearing it when I test drove the car, maybe it's been there all along and I am just now making note of it.
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Having metal-on-metal loud sound coming from underneath the passenger seat (basically) at higher rpms? It sounds like it might be a heat shield or loose piece of the exhaust but I looked underneath and saw nothing out of the ordinary. It seems to be getting worse, so I am assuming its not supposed to sound this way.
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Vehicle makes a rattling sound underneath (mid/rear end area?) when hit bumps and mechanic said may be the anti-sway bar (or front struts). What is that and how important is it to fix? Vehicle has 108,000 miles.
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I have a 2007 XLE-V6, bought new 10/2006, 39,500mi., and recently I had the issue of the bursting oil line that others have been having. Prior to that happening, I have been hearing a noise from the engine since the beginning of December. The noise is a ticking sound/knocking sound that occurs as I accelerate in 1,2, and 3rd gear on cold starts. This noise persists up until the time the engine reaches its ideal operating temperature, and then it just goes away.
The engine "expert" at my local dealership drove in it with me, and it only happens when the vehicle is in drive, not when idling or in reverse, so it has to be in the drivetrain somewhere. He said it shouldn't be a problem, since it does go away, but it's infuriating to hear it every morning and afternoon when I start my car.
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2005 Dodge Caravan - Driving to work this morning. Last mile of a ten-mile trip, there is a steep hill. As I accelerated the car began a rattling sound in the engine compartment. Never heard that before. Also, smelled like something burning. Rattling stopped after topping the hill, but would begin occasionally whenever moderately accelerating, then go away. Oil and temperature gauges read normal.
Got to work, and checked the fluids. At acceptable levels. At lunchtime, decided to try to drive it home. All quiet for the first mile and a half, then rattling started up again. This time, instead of just at moderate acceleration, it also sometimes rattled when coming to a stop or turning. At five miles I had to stop at a store to pick up something. Wasn't gone long, and when I started it back up and drove off, no rattling until about another mile down the road.
Four miles later, the rattling got worse and did not stop. I pulled into a parking lot just as the engine died and smoke poured out from under the hood. The hood release is broken, so it takes some time to pop it. By the time I got it open, the smoke was gone so I did not see where it was coming from. Could not see any obvious problems. Let it sit for five minutes, then it started right up. No noises, and couldn't see any issues while running.
Less than a mile from home, so I decided to go ahead and drive it. The van behaved until about two blocks from the house, then the occasional rattling began again. Made it into the driveway.
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I have a 03 passat with a 1.8t with 126k on it. I just bought the car last week and ever since i got it it has issues i cant figure out
On cold starts its makes a chirping sound under the hood that gets louder as you accelerate but goes away after motor warms up. The sound is similar to a loose or bad fan belt. But the noise is coming from the back passenger side of the engine when you listen under the hood.
Car also has no power. Had a good pull when i test drove the vehicle but now its a dog. It seems like its running on three cylinders or the turbo aint even working
Car is a 5 speed and its a struggle to put the car into first gear but every other gear is smooth. To get it in first you gota be stopped, put it in second then to first and you gota push the shifter left till you feel it pop in gear. Also have to hold it in 1st or it will sometimes pop out...
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My ford windstar was making a clacking knocking sound when I had to accelerate for an incline. ( I live in the mountains) Last night on my way home from work it was clacking more often. It has also within the last couple weeks randomly acted like it was not going to start almost like it wasn't getting any gas. The not starting is almost an everytime occurrence and today it started clacking any time moving and this evening it started clacking as soon as you start it. [URL]............
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Well I have been hearing a rattling sound coming from my engine when I accelerate around 55-70 for a second and then coast. Once I start coasting I hear some type of rattle noise coming from the engine. I just got back from the dealer and was told that the mid-section to my exhaust was bad and it needs to be replaced. The part # is 28600-4z300. I looked it up and it costs $1400 now, but it is on sale for $1000. I am hoping that this will fix the issue I am running into right now.
This problem adds to the list of crap I have been through with this car starting at 4000 miles. First a blown timing chain blows my engine, then my car goes into the shop 4 different times over a month and a half for a overheating/coolant issue. Had to get the engine replaced because apparently my "NEW" re-manufactured engine was leaking coolant into my engine. Now only 2 months since that has been put in I need a new exhaust..
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I recently acquired a 2003 Camry with 150,000mi. its has a rough take off from stop and when I accelerate it make a rattling/grinding sound. the sound disapates after around 30mph. Ive changed trannyfluid, oil change next is plugs and all that good stuff since I do not know when it was done last.
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Recently blew the belt that runs the water pump, etc while on a vacation. Had to leave the car at a small mechanic in Winthrop, WA. He replaced the Water pump which had gone bad and the belt that shredded. The car ran beautifully for a week. Now there is this constant rattling sound coming from the water pump area. the link is a video with the sound. The sound will quicken as you accelerate. At cold start up it is usually not present then starts a couple of minutes in.
[URL] .....
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My car had been sitting in the garage for over 5 hours after short drive this morning. I went into the garage ( without the FOB ) and heard a strange buzzing sound. After walking around I determined it was coming from underneath the rear of the prius. I opened a couple of doors and the hatch and the sound was definitely exterior not interior and continuous.
I don't know how long this had been going on but it was continuous for at least four minutes. I thought the best thing to do would be to take the car for a short spin. I went inside the house to get the FOB and returned to the garage - the noise was still there? I approached the right rear bumper to get a better listen and it stopped suddenly. I guess the difference was the proximity of the FOB?
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When I accelerate I notice a rattling noise almost each time. Is it bad gas? I have been getting gas (90-95% of the time) at the same gas station for years, including the whole time with my 2011.
Also for the first time today i got an error message on my screen for the radio that says something to the effect that the USB has too much power consumption and will not run.
When I powered off and powered back on after lunch it started working again. I never had either problem with my 2011.
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I currently own a 2006 prius which has done about 100k km. I've been hearing knocking and rattling sounds coming from the left tire whenever I go over a rough patch of road or even a speed bump, between slow to moderate speeds. It's currently bearable, but it gets irritating at times and it seems to be getting louder. What is the cause of these noise and how I can rectify it? I wish to get rid of it.
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The engine starts with knocking, rattling, and vibration that lasts for about 5 seconds. It seems to be an intermittent, rare event. With nearly 250,000 Prius in the North American market and the onset of cooler weather, it is time to see how frequently this occurs.
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So I have a crack that has grown from underneath my hood all the way to the middle . Can this be a defect ? I have an 2006 avalon.
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My car is accent 1.4 A/T 2012, and lately I've been hearing this metallic knocking sounds underneath my car. it happens every time after i drove my car for a longer distance and even on a shorter distance with no minimum running speed, you can hear the metallic knocking sounds whether the engine is on or off. Sometimes it is too loud you don't have to go out from the car you just have to roll the window down to hear it.
I've brought this already to my dealer and told me it was normal but I don't want to accept their answer so i refer it to another hyundai dealer. the second dealer made an adjustments on the muffler and catalytic something and even upgraded the CEU but to no avail and even adjusted my steering preload. BUT I'm still hearing it!! What to do.
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Santa fe developed a noise underneath that rattles up to the gear shift. It happens mostly when you take your foot off the gas but can happen if your just cruising. Engine does not make any noise while revving it or under load in drive with foot on brake. Definitely sounds rotational but all looks ok underneath.
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Experienced a noise that is evident when the side window is down which seems to coming from underneath the car. It is difficult to describe but it is a ticking / light metallic sound. Possibly coming from the exhaust system area. It is particularly annoying at a drive through window where the sound reflects off the building.
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My R32 has got about 9,400mi on it, and for the past 3k miles or so, i've been dealing with this metallic scraping/rattling noise coming from underneath the car. When I took it to the dealer, they said it was the exhaust flex pipe, so they replaced it under warranty. Next day after picking the car up, same noise. So i took it in again this morning and they are saying its the flex pipe again, and they don't know if it is fixable.
They are talking to VW tech assistance, and trying to figure something out. I really love this car, but if VW says there is no fix for it, I'm weary about possible future issues without fixes too. Apparently it has something to do with the length of the flex pipes and the material its made out of. He was saying one possible solution is stiffer engine mounts. We'll see where this goes.
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