Prius V :: Engine Ping (rattling Metallic Sound) Under Load
May 24, 2014
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.
View 15 Replies
Advertisement
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....
View 16 Replies
1988 Ranger, 2.9, 5 speed, 2wd, 7.5, 3.42:1, 190K or 290K on the odo.
I've been hearing this rattling, sometimes kind of a metallic ping, from the rear the last week. I thought it was probably the universal joints, didn't do it often, only under load between 1500-1900RPM roughly in second, third and fourth. I planned on working on it this weekend.
Today it started really making noise, sounds like valves rattling as though the timing was too high but it was coming from the rear end. It was making it all the way through the gears into fifth, even when cruising. Once it cooled down a bit it nearly went away.
I'm going to get started on it as soon as I can, but I can't get it in the shop to pull the differential cover and take a look right now. Dad's shop is full of crap, I live on top of a hill, not many safe places to get one up in the air properly. What is causing that sound?
View 5 Replies
We've got a 2012 Hyundai Accent GDI. I've been hearing the rattle "ping" when the engine is under load (accelerating hard or uphill). I've read that this is typical for these engines.
I took it to our local Hyundai dealership since it's still under the 60,000 mile warranty. They updated the computer settings and I put in a fuel additive to clean up deposits. They also told me to buy name brand gas from here on out (Exxon, Shell, Mobil) as these engines don't handle cheap gas well.
Now that I've given you enough of a backstory, here are my questions:
- For those that have experienced the rattle "ping", what did you find fixed the problem?
- Any tips or things to look out for when cleaning the throttle body etc?
View 16 Replies
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.
View 6 Replies
I've been having a this rattling sound metallic type of rattle when I'm under load, meaning acceleration, on flat or hill side roads, then the sound goes, someone told me it can be the center shaft bearing..
View 6 Replies
Have a metallic/rattling sound under my car while idling. Don't hear it while driving. 2010 Mitsubishi Outlander
Here is link to sound file [URL] ....
View 2 Replies
My 2002 Dodge Grand Caravan has a sound metallic rattling at about transaxle area (I am not sure if it's a transaxle issue) when it's cold but when it's at operating temperature, I don't hear it anymore. Fluid level is correct and clean, I just have the fluid changed. Shifting is fine, just annoying sound, not loud but it can be heard easily.
View 4 Replies
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?
View 11 Replies
Front end makes metallic rattling/clanking sound. This happens when I make a right-hand turn, and the noise comes from the left-front wheel area. I describe it as the sound of dropping a handful of pots and pans.
View 4 Replies
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.
View 14 Replies
Recently I started hearing a rattling/grinding metallic sound coming off the right rear while driving slowly. This sound is not reproduced when braking.At first it started while doing sharp right turns only, now its ever present while driving. I showed it to a mechanic he says rotors needs to be replaced. Is he right? 2003 Honda Accord V6....
View 7 Replies
While driving through a tunnel today I noticed a metallic rattling noise upon acceleration. It goes away immediately when I let me foot off the gas and when I park the car and rev the engine the sound does not occur.
A few days ago, I had to rapidly accelerate and it felt as though I lost power for a split second. I am not sure if these are related, but I am hoping its not some sort of transmission issue (unless that is covered under the hybrid warranty. What was the diagnosis?
View 1 Replies
Today I drove my 2006 G2 Prius with 59,000 miles to the park and had the windows down. I climbed a hill for a good while that had the engine under load and there was a concrete wall beside me, and I could hear a very very faint metallic-like rattle. I mentioned it to my partner who listened and said he couldn't even hear it, so maybe it is just me.
View 2 Replies
I'm having a problem with my Prius. It pings under acceleration and it sounds like something metallic is rattling. It only happens when I use 87 and 89 oct. I use 91 premium to reduce the ping however, gas prices are rising and I want to go back to 87. There are no warning lights or anything and the ping has been happening for quite some time now.
View 3 Replies
Noticed a weird metallic rattling noise coming from the transmission when switched to N with the engine running and the car is stationary? Almost like the gears are rattling inside while in N position. I took it to the dealer and their Prius guru said this is normal characteristic of eCVT....
View 4 Replies
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.
View 14 Replies
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.
View 19 Replies
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.
View 2 Replies
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.
View 12 Replies
Getting a metallic rattling sound between 2.4 and 3k rpms under load? It can't be reproduced by just revving however, I can reproduce this easily while holding it in gear with the triptronic and accelerating in that rpm range. I want to say it sounds like a exhaust or heatshield rattle but it's coming from the front the car, like behind the firewall or directly below me. I took it to the dealer and of course, in a typical dealer fashion, they cannot hear it.
View 5 Replies
