Prius (Gen 3) :: 2012 - Jerky Acceleration From A Complete Stop In Summer Heat
Jun 21, 2016
My 2012 Prius Two did something odd today that it's never done before. Today, after leaving a meeting, I had two instances where accelerating from a complete stop was met with a delay followed by a jerky and sudden acceleration. This only happened twice out of the dozen-or-so complete stops I made. This only happened on my first couple of complete stops, then never did it again.
Here is some pertinent information:
- Silver Prius, no tint
- Car sat uncovered for about 2.5 hours
- Was 96 degrees outside, not a cloud for miles
- Turned the car on, opened the front two windows for hot air escape
- Turned the AC on to full
- Sat parked but car running for maybe 30 seconds before reversing out of parking spot
- Rolled up windows
- Battery fan was going strong
- No indicator lights came on to suggest an issue
- Happened on my first two complete stops at stop signs
- Never happened again
- Battery fan eventually simmered down
- Have 55,000 miles on the car
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I purchased a 2012 Subaru Forester 2.5X Premium (automatic transmission) in November 2011 with 4 miles on it. Since the get-go it has had issues, but we thought that some of them might work themselves out as we broke the car in (which we were religious about). At the first oil change, we told the dealership about the issues we were experiencing and got the expected "the computer doesn't say anything is wrong" and "we couldn't replicate the problems" excuses. We were told to bring it back if the problems continued. Well, they've gotten worse. Here are what we are experiencing:
- Erratic shifting. I commute from the mountains to the city every day, so I need power from the car. Sometimes, when I'm heading down a hill and I tap the gas slightly to give myself a little boost, the car will suddenly downshift, even though it was sitting at 2500 RPM and didn't need to get any extra power beyond more fuel. Going up the hill is worse, as if you are not actively accelerating (including if you are trying to maintain a constant speed), it will upshift on you and you lose all power, so it will need to downshift to make up for this. It does this constantly for the entire drive home. Everyone who has driven this car in the mountains has experienced this.
- Jerky transmission. When the car shifts, it is super harsh and tends to throw you forward or back. Even when on flat ground it shifts roughly.
- Sluggish acceleration. If I give the car any more gas than I usually do, it hesitates before going anywhere. One day I needed to get over on the highway fast and floored it - it took the car about 2 seconds to respond. Then, yesterday, we were turning on to a highway from a side road and I tried to accelerate (gas about 1/2 way to the floor) and it didn't respond at all for about 5 seconds and the "Check Engine" and the traction control lights started flashing at me. We were on a paved road with no gravel, water, ice, etc and the traction control light began flashing on the straight, not while we were turning. There are also days when it feels like there is an anchor tied to the car and it just doesn't want to give me any umph at all.
- Rough starts. This is the really weird one as there is no rhyme or reason as to when it happens. Some times it takes the car several revolutions to turn over. Oddly, it's never on the really cold (under 20 degrees F) days, but it has happened when it is ~35 degrees and a couple of times when I have started it in the middle of the day to grab lunch and it is ~65 degrees out.
- Running rough. This usually happens after a rough start, but can also happen at other times. It just idles very rough and won't calm down. These are the days I have the worst time with the shifting issues.
I had a 2001 Forester that threw a rod, which forced me to get this car. Everyone who has driven both agrees that the 2001 was quicker, easier to drive, and had more gumption than the 2012. It also had less problems even though I purchased it used in 2005 (until the whole rod-throwing thing, of course). I really want to love my 2012 Forester, but I am so upset that, for the first time in my life I have a new car, and it runs terribly.
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However, last night, I was driving around. When I came to a stop at a stop sign/red light/etc. and then proceeded to accelerate, I would hear this weird squeaking / creaking sound. I've heard it multiple times now since then. It doesn't do it every single time I accelerate, but when it does, it lasts for about 3 seconds and then stops. I've also noticed it does it sometimes when I make a turn and then accelerate. It's just a squeaking sound.
Is this something I should be concerned about? It doesn't do it every single time I accelerate, but when it does, it will last for about 3 seconds. I should also note that the car made the noise the first night after I had been driving for a while, so the engine wasn't cold or anything.
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It's been over 100*F recently, and we just started running our AC on BLAST (Auto, 74*), and my perfect Prius has been giving me acceleration issues... When it's in PWR mode (100% of the time) and the AC is full blast, and I punch it, the car hesitates, jerks forwards, hesitates, jerks again, then eventually once it's over 15-20 mph it smooths out and goes.
Just to add to the chaos, for the first time ever in my life, I actually HEARD the fan from the vent for the battery. It was pushing air out after I parked the car. Never heard that before, ever! I just want my Prius to be as perfect as it's always been... BTW, I pretty much drive the heck outta that thing. I like how it goes around corners and the acceleration in PWR mode.
2010 Prius, 75,000 miles ....
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Now that the weather has warmed up, I'm using AC once in a while. Whenever it is running, when I come to a complete stop, I hear a groan that lasts for about 3 seconds. It vibrates through the brakes a bit. This is only once the car has stopped, and only when AC is on. It goes away after a couple seconds, and is guaranteed to come back on the next time I stop the car. Is this just the compressor cycling on and off?
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I notice the brakes are very grabby right before you come to a complete stop. This seems to occur more when this brakes are cold. Is this typical with the gen 2's? Mine in a 2005 if that makes a difference. So far with 2k miles on the car I'm not a big fan of the brakes, but everything else I love.
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Just bought a new 'C.' 35k, and now 271k. After I come to a complete stop it makes a creaking sound like bad bed springs during hard and light breaking. I've baby this car, I love it, and I just want it to last for as long as it can. It's really annoying to hear every time after I come to a stop. Not before, not during -- right after (just like when you make a complete stop at the stop sign or red light, or just stopping in general).
This is supposed to be a brand new car. There's something wrong and it's not a normal thing for Prius's after you've start using it daily. I've never heard it before until today.
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I've been noticing that when I brake more responsively, I feel a bump/notch right before a complete stop. It feels like something that has to do with the transmission.
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I've been noticing on the 2006 I've purchased recently with 120k miles now, the MFD would show the ICE engine no longer is on and proving power when I cruise to a stop. However when I'm actually stopped, I noticed the ICE engine is still on, about 5 seconds after I make the complete stop, I then notice the ICE engine shut down. Although there are no DTCs on the car, this seems to baffle me on why it's happening. The mpg average on the car is lower than my other cars, it can be anywhere from low 40s to about 45mpg on the MFD. What could be causing this?
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I just bought a new 2015 prius a few days ago. After a couple of days of driving it around, I noticed this clunking noise that lasts about 2 seconds while the car's shutting off its gas engine when the vehicle is at a complete stop. It happens more frequently a few minutes after I started driving the car. When the car is coming to a stop and the 'EV' light is not on yet (only 'ECO' light is on), after the vehicle's made a complete stop, I start to hear this clunking noise (it almost sounds like the noise you hear when you press down your emergency break).
After this noise, I feel the vibration and hear that the gas engine's shut off. I talked to the dealership and they hopped in to hear that noise, and as always, it didn't happen. But as soon as I left the dealership, I hear it again. the car is normal when 'EV' light is on when its coming to a stop (no abnormal noise), but its only when the gas engine shuts off after the car has made a complete stop. And the noise is even louder when the vehicle is on a slope, either uphill or downhill.
I uploaded the video file ....
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