Prius (2004-09) :: Weird Rattling Sound For 30 Seconds During High Load / Low Speeds?
Sep 16, 2012
I've noticed, maybe a handful of times in the 5k miles I've owned the car, that the engine will rattle excessively for maybe 30 seconds or so on a drive. This only happens during high load/low speeds and I think after the engine has been off for at least about 10-15 minutes. It doesn't happen on start up, only after the car is warm, but hasn't been using the engine for a bit. I'm thinking this is fuel enrichment (really rough running) because the cat has cooled.
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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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It's been cold, but I've been driving. When I park and power down, I'm hearing a high-pitch sound...like a fàn...it lasts about 10 seconds.
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Hard to describe sound, but it only happens under load. It happens at any speed, but more predominently at higher speeds. When I lift off the gas it stops. I can keep it going up hill since I'm maintaining speed rather than accelerating over the limit. The other day I heard another F150 beside me making the same noise going up a hill.
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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 have an 04 rx 330 with air suspension. The swaybar end links have just been replaced on the front and a rattling noise persists.
The noise happens over large and small bumps at high and low speeds at normal and low vehicle height. When the height is at "HI" the noise is louder and it feels as though the front end is shaking loose over bumps at 10 km/h+.
I took it in and was advised to replace the end links, they did so and returned it claiming the noise was gone. The air compressor and struts are in working condition.
I have done a search through the forum, not extensive... I was wondering which other components come loose/wear and cause a clunk/rattle/shudder noise.
Also, tires are new and at approx. 32-34 psi.
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I can hear rattling coming from the driver's door at low speeds on uneven roads. At higher speeds there are no noises, it only happens at speeds of up to 50 km/hour. I removed the door panel and there are no loose parts.
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I have an 06 with 105000 miles. Since about 95000, I've been starting to get what sounds like a fuel knock with medium-high load on the engine. Thought it was carbon at first, but a few applications of Techron didn't clear it. Higher octane does seem to solve it.
Do the knock sensors go bad on a Prius? What's the proper way to diagnose the knock sensor on a Prius? (can't exactly bang on the block with a wrench at idle and listen for fuel adjustments on a car that doesn't idle).
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It has been just about a year since I bought my CPO 2007 GX470, and I still love it like the first day I drove her! I've noticed one little thing I can't put my finger on, though - an intermittent rumbling/rattling sound coming from the ceiling during high speed highway driving and/or high winds.
Now, I've checked the sunroof itself, and there doesn't appear to be any "give" to it. It's solid. Same for the surrounding parts of the mechanism. Yet for some reason, during 70+ MPH driving and/or high winds, I get this low-pitched "WHUUUM..WHUUUUM..." vibration from somewhere above my head.
Haven't taken it to the dealer yet since I'd like to identify the issue myself if I can, but it's hard to isolate when you're focused on driving.
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I was driving today and had just gotten off the highway. I was going at no more than 10MPH when I heard some high pitched sound. At first I couldn't figure out what it was and thought maybe it was some outside noise. It quickly got louder over the span of the next few seconds and then I realized it was the engine. I had the pedal barely down so was definitely in electric mode.
I quickly glanced at my Scan Gauge and actually saw the RPMs go from 1200's up to 3400 in no more than 10 seconds. I have never had the car rev this high, probably just 2400s when I'm on the highway going 70's. By this time I was getting very perplexed and worried, and had my foot completely off the gas pedal. I immediately pulled to the side of the road and parked (hit the P button). The car seemed to go into park mode fine and then over the next few seconds the RPMs went back down to 992, and I made it back to the house no problem.
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I bought a 2010 prius 3 weeks ago and a squeaking sound came out after driving it for a week. The sound is like a wooden bed not screwed tight being shaken. My prius has 40000 miles on it and the warranty has expired already. I brought it to a toyota dealership and they could not find where the noise is coming from. I decided to bring it back to the dealership I bought it from and they also could not determine where its coming from. They said they need more time to find it. The squeaks often comes out in wavy roads and bumps and in both low and high speeds.
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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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The issue: when I reach 37-40mph I have a new sound which I believe is the transmission 4R100. It sounds like a flat spot on a tire, or the sound tires make when they leave the sticker on them. The cadence of the sound is slower than the rotation of the wheels.
If I let off the accelerator, the sound stops, as soon as I add load by pressing the accelerator the sound returns. If I shift to Neutral the sound is gone.
If I coast at any speed the sound is gone. It is only audible when under load at speeds above 37-40 mph. The cadence does increase as I speed up, but it doesn't sound as fast as the motor is turning (~1900 rpm's).
I monitor the truck with torque pro using the PIDs defined here on FTE. I can see lock-up in 3rd and the shift to overdrive. When in lock-up, I see 1-7rpm TCSlip.
Watching transmission temp as reported by torque, the hottest I see is 183* pulling an enclosed 6x12 @ 75 mph. Ambient temp is 95*. Excursion currently has 240k miles on the clock.
This sound was first heard by my wife two weeks ago. I thought I had tire issues and they needed to be rotated. The sound is still present, and now identified only when the truck is in drive, and under load, regardless of me pulling a trailer.
Yesterday on my 500 mile trip, the truck hiccuped several times which I believe was around the time I was either moving in or out of overdrive. Details in a different thread: [URL] .....
Anyway, I've looked at all culprits and can't find anything with the motor, or electrical system. I can't get to a transmission shop until Monday, and won't have my AE until I get home Sunday night. I have a 500 mile run tomorrow. I checked the transmission fluid and it's at a good level, pink, and doesn't have a bad smell.
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I recently installed a 42 DD DP in my 2012 CW Golf R. I have noticed that under high load (mostly down shifts) that something is knocking under the car. It is a single bang sound and only happens under high load. I did the DP install myself and I have since done a quick check to see if the exhaust is loose. It is not. I have checked the Drive shaft and all the bolts are tight. I suspect it is the exhaust hitting something but I don't know what.
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I started hearing a small rattling sound coming at low speeds while driving. It's a tic tic rattle which almost sounds like a cat, but it only does it while driving and not all the times. I had a smiling noise once on one of my cars and it was a torque converter. It's not the brakes, as applying brakes doesn't work. Also the whole front end is brand new. It motor related. Can a heat shield for a cat come loose?
I'm also dealing with a wind noise coming from a driver side window. My car has the updated thicker windows. The noise goes away if I lower the driver side window just a fraction. So having it closed all the way creates more noise. Other than that wind noise is at a minimum.
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I had to drive my wife to SEATAC this morning. I would normally drive my car (Camry), but my trunk is a mess with muddy tire chains and the back seat is a mess with muddy dog fur, etc.
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I have 124,000 miles on my 2002 subaru impreza outback sport and this car runs very well and has been maintained well however the last couple weeks I have noticed a slight rattling sound toward the right front side of the car almost as if there were pebbles inside the wheel covers when the car is driven at low speed and I begin to accelerate. It also sounds as if the rattling could also be coming from the exhaust also as if it were loose fitting but the tailpipe is on the left looking from the rear of the car. Another possibility I thought of was the fender was loose or the tire was rubbing against the wheel well or something. It is one of those small annoying sounds that does not seem to warrant bringing in to a mechanic yet but I am curious about what that is.
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I have a 2001 Saturn SL2 1.9 liter DOHC. I am getting a metallic rattling sound from under the car. The sound happens only at certain RPM idling speeds; what could this be?
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When I'm driving over sharp bumps I hear what sounds like a small chain jingling around. I took off the hubcaps and jacked up the car to see if anything loose. I grabbed the exhaust pipe and shook it, but it didn't make any noise. I couldn't see anything that would cause it. The front right strut's rubber cover is off so could the strut make that noise?
I just read a few posts with similar problems, but one was a compression sound and another was a knock, and another was a metallic hick up. Mine is literally like a loose high pitch chain noise and change rattling in your pocket. No uniformity to the sound. But it also only happens over quick small bumps not large ones like speed bumps.
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Like the title says, weird sound after sitting in the car in off position around 15 min. or so. The first time this happen I jump out to see if a bird landed on the roof of the car, but no bird. Anyways, It has done this every time I sit in my vehicle with it off.
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When I apply the brakes at speeds of 30 mph and under I hear a ticking noise. (The noise might still be there above 30 mph , but due to road noise I cant hear it)
I believe it is the front drivers side but after taking wheel off and taking it to the dealership. I can not find the problem. The dealership states they can't hear it while on several road test, but I have showed them the video clip and they have no idea what it is.
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