Prius (2010-12) :: Unusual Acceleration When Engine Is Warming Up
Apr 25, 2013
Basically, when driving shortly after turning on the car (when the engine is still warming up) I often experience a 'shot' of acceleration despite not further depressing the accelerator. In other words, I'll be driving along smoothly and suddenly the car will speed up slightly by itself without me having done anything. This only occurs when the HSI is past the middle (i.e. when the engine is powering the car) and when the car has recently been switched on. It's almost as if the sensor that detects my acceleration is re-calibrating itself while I'm driving, increasing the input to the engine.
The first time it happened it was a bit of a shock and I was a little scared, however I'm used to it by now and can anticipate it happening (however it doesn't happen 100% of the time). It's nothing too serious - it probably only accelerates a couple of KMs above what I'm actually doing but still is a bit of a worry. I'll be taking it in for a service shortly and seeing what they say about.
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I have purchased a 2010 III Prius with 73K miles last week after my 2006, everything is fine for me but I have a scary problem , the engine sound is very high while driving even after enough warming up, specially when the ECO meter reaches the PWR area or when accelerating hardly, I tried changing the engine oil with synthetic 0W-20 and the filter and the sound still the same.
Check the video attached and also note that
- Its winter here and temp is 50F.
- The car was imported from the US,
- The speed in the video in KM/h.
- I am using clean OCTANE 95 fuel.
- The video was after driving 20 Miles.
- I have latest version of Techstream with original Mongoose MFC...
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This morning I went to start my car and while the engine was warming up (it's carbureted, not fuel injected) I heard a strange sound that I can only describe as sort of a "gulp" or something. As I was driving to the doctor, at one point I was going up a slight hill so I went to accelerate and the RPMs reved up but I didn't go any faster than I was going, which was about 30-35mph. What's going on here? 1987 Honda Accord LX....
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My 2010 Sonata GLS recently started to emitting some noise during acceleration, seemingly come from under the hood. The noise is most noticeable between 15-25 MPH, and is more noticeable when I go uphill. The noise also becomes more frequent with higher speed.
I have a shared m4a file with the noise recorded on Google Drive [URL] ......
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When I'm leaving the house and I pull out onto the street, I have to go close up a very annoying gate which takes a good few minutes to do. The car is still in it's warm up mode so the ICE is running the whole time. I know just turning it off would save gas, but would it be bad for the engine, to turn it off with the key before it shuts itself off?
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Car was working just fine. i changed the oil. after this, i have this problem:
Engine cold or go at freeway speeds = no problems
Engine hot and stop and go traffic = sometimes the engine will not rev above 1000rpm. when stepping on the gas, i will get a rough idle but engine would not go over 1000rpm.
I can shut off the car and wait some time, then the car will work again for a while.
No check engine light, no error codes, nothing .....
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I'm having a trouble when accelerating at low rpm the engine begins to rattle. Tried removing the connector plug on the egr, to my surprise the rattle is gone but the engine light comes on saying that the EGR circuit is incomplete. Took it to the dealer and they diagnosed it to be the EGR valve opening but failing to close, so they instead proposed to fill in gas with a bottle of their injector cleaner. That made no difference, so tried replacing the EGR valve but again makes no difference. What could the culprit be?
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Lately I have found that when I am trying to go up an incline on my road, that my car has trouble accelerating. Almost as if the engine is being choked off like it is about to stall or is out of gas. I have to press the accelerator almost to the floor to get up the incline. The suddenly it will lurch and accelerate rapidly as if I have put the car in Power Mode.
I should also add that this only happens when the engine is cold. I didn't have this problem last year at all. I usually wait a couple of minutes after the engine starts before I try to drive, but that doesn't seem to work.
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Slightly shaking engine and rattling noise on acceleration,it happens when the car is hot and especially when the battery level is very low ,I guess is when as more load . If I accelerate and keep it steady at 20mph I can feel a constant vibration but goes away once accelerating more....like if you're driving on a rippled surface ....that is only when engine is on , doesn't happen on electric only.
The noise it sound like a tapping coming from the engine when slowly accelerating from 0 that goes away as soon I give more gas ,is annoying wile in the traffic.? Can the sparks plugs be the problem?they been changed 120k ago.....,I cleaned the egv pipe but problem still there. Like I said is only when the engine is up to running temperature.
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I was driving my 2010 Prius on the Highway (less than 2 miles) and the engine check light came on.... shortly after the ! (triangle with exclamation light came on and then started flashing). I exited the highway and was going back home. On the way home, I noticed a decrease in acceleration and then a message 'Hybrid...'
I was able to coast into an apartment complex and then got a ride home.
After about a couple of hours, I went back to the Apartment Complex. I reviewed the manual and one of the options was to check the gas cap. I filled the tank up last weekend and haven't driven it since today.
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I am getting unusual noise from engine bay. I first thought it's the belt but doesn't seem like it. I am scheduled to visit a dealership but would like to get informed as much as I can.
[URL]...............
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This morning I had an unusual problem after starting up the car. When the gas engine kicked in, the car started shaking a great deal as if the engine mounts had come loose and the engine was moving around. I quickly turned it off and waited a few minutes. When I tried it again, everything was normal.
Thinking back, I'm not sure if I put it in gear before the problem occurred. Wonder if putting it in gear just as the engine is starting up could trigger something like this.
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So earlier today i noticed this unusual noise coming from the engine bay. You cannot hear it if your sitting inside the car. Only time you can hear it is if the car is running and you happen to be standing in front of the car.
The noise isn't constant and tends to come and go. After about 6 plus tries trying to film it, I finally got a clip where you can hear it for a bit.
2009 ISF - unusual noise from engine bay - YouTube
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My 2007 Prius has started making an unusual sound. At first I thought it was some kind of pump or something, but now???
When I put on the emergency brake, the brake pedal or when I put the car in park or take it out of park and put it in D, it makes a "chuck chuck chuck" sound, not high pitched, but not a low sound either. It seems to be coming from under the hood on the left side. It sounds something like a belt slipping or a pump with a squeak maybe?
It does not appear to make this noise when simply depressing the brake while driving, so I'm not sure it's the same abs actuator issue.
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I purchased a 2011 Sonata about 6 weeks ago. I like almost everything about it, but the engine is very noisy. I'm not talking about a loud growl when you accelerate, but it's almost sounds like there are 2 frequencies sounding at once. It's higher pitched and at times sounds like pinging or clattering. It's very hard to explain. Unfortunately, sometimes it's worse than others and when I've taken it to the dealer, it's not at it's worst. The dealer I purchased it from told me that it was normal, even though I drove another 2011 on their lot that did not have the sound. Another dealer told me that it was a loud fuel pump because of the high pressure of the injectors and that Hyundai is aware and is working on a new "cover" that should muffle the sound. When I contacted Hyundai directly, they did not know of any new "cover" being developed . Assuming I've described it well enough to know... The only thing I know to do is wait for it to get consistently worse, and take it in again.
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I decided to get an alignment (for the first time since I took delivery of the car). I noticed some unusual wear on the inner and outer tire. I will post a before and after pic of the alignment. As you can see they were unable to correct everything.
The shop says that the prius does not have any way to correct camber in the front nor was there any way to correct the toe in the rear.
I cannot think of anything that would have messed up the rear left. The shop was saying these repairs will need either a new control arm or strut.
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I have a 2005 Prius with 128,000 miles. At the last service the mechanic pointed out that the front tires were wearing significantly on the outside. I had them do an alignment but the before numbers were hardly out of spec. Everything was in spec except the front right camber - it was right at the limit (negative). Everything else was perfect. I would have expected only significant positive camber on both sides would cause both front tires to wear on the outside, when everything else was in spec?
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I'm relatively new to owning a Prius (just over a month now) and am loving it so far. I've also been lurking these forums for a while and love reading over the technical explanations of how the Prius works and all that stuff. There something that I've been curious about recently
As we all know, unless it's already been running/warmed up recently the ICE has to start up around 7 seconds after turning on the ignition (unless in EV mode). When it does, fuel consumption figures go through the roof (10-15L/100km - which equates to around 20mpg) which is obviously very high.
Now, I leave my Prius in the underground garage of my apartment complex which is basically about 20 degrees celsius (70 fahrenheit) year round, which is pretty warm. So I'm curious about a few things:
1) Why the engine has to warm up when it is stored in a warm environment anyway (a regular ICE car doesn't need to warm up - you can turn it on a drive off).
2) Why fuel consumption is so high when the engine presumably isn't actually doing anything other than idling (or is it??)
3) To improve fuel consumption, would it be better to start off in EV mode, and only switch to normal/ECO when I know I'm actually going to need the ICE such as when I enter the actual roadway (so the engine is never in use when it is not actually powering the car)? I know fuel consumption will still be higher than normal as with any car when it is first started, but wouldn't this at least save it turning on unnecessarily?
4) If it is better to do this, why does it need to 'warm up' at all?
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I'm experiencing an unusual grinding noise when accelerating from a dead stop but only in this specific situation.
1. When battery is at a low state of charge and the AC is on, therefore, whenever I slightly step on the gas the engine will immediately start.
2. Only under this condition, when I slightly press on the gas and the engine will start to charge the battery and propel the car at the same, there is a slight grinding noise coming from the front of the car. I don't know what this noise is, it sounds like gears grinding, it's very light though.
I know it's not the brake accumulator noise, because that's a whole different sound, and also this only happens under the condition I described above. When battery is low and ac is on, and the engine will need to start right away even when gas peddle is slightly depressed.
The best way to describe the sound is if you were to take a soda can and cut it in half and rub the two halves together (the edges) it sounds like that.
Also, there are no lights on the dash. It's a 2009 with about 73,400 miles.
The transaxle oil has already been changed maybe 10,000 miles ago.
The noise started recently, at least I only noticed it recently since it's summer and I have the ac on much more. There are no drivability issues, but the thing is, this noise was not there before, I know I'm not hearing things. You know when you drove a car for quite some time you will naturally know what sounds are normal and what sounds are new.
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I have a 2007 Prius with about 77,000 km on it. Lately I've noticed that the car would make an unusual noise sometimes when driving at around 50 - 60 km/hr in stealth mode, with slight accelerator pressure such that the energy monitor shows power flowing from the battery to the motor (ie - not gliding or regen braking).
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I've noticed over the past two mornings while driving to my office a sort of whirring sound for lack of a better word. It has only happened in the mornings. It has been low to mid-50s temp. The sound seems to be coming from the left side of the engine bay or inside the dashboard. Basically like a fan sound but this happens even without my HVAC activated. It doesn't seem like a big deal but the reason I mention this is because it's the first time I've even experienced this since buying my Touareg last year.
Interestingly, after shutting the engine off and restarting, the sound goes away. This particular sound is definitely noticeable, even with my stereo on.
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