Prius (Gen 3) :: Engine Is Knocking A Bit Just Before It Shuts Off
Sep 18, 2013
Lately, the ICE has occasionally been vibrating or knocking a bit just before it shuts off. It seems to be more noticeable when the car has just stopped at an intersection.
The humidity here is higher than normal for Colorado. The temperature is in the 80s F, so it's not a cold weather issue.
I've been driving through more water than usual due to the recent flooding here. I wonder if that has something to do with it.
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I have about 200k on my forester. Friday when I was leaving work I cranked it up and it made a loud knocking sort of sound. I drove it home (about 15 miles) and on the way the sound lessened. It was louder when the car was idling but she made it home ok. Next day, started the car and it happened again. Not more than 50 feet up the road we stopped at a stop sign and it sounded like a semi was starting up around the corner. Much to my dismay it was not a semi but my own car. Engine shut off. We pushed it back to the house and tried to check it out the next day. This time, we started it, didn't go anywhere, and within 30 seconds it turned off. Same loud knocking sort of sound. The confusing part is that all of this happened within two days. There was no gentle sound leading up to it for a few weeks or even a few days. Knocked on Friday, shut off on Saturday. What could be going on?
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I have some check engine lights. And there is one light on my monitor screen in the top left. That one is a hybrid system warning light I think. I'm sure I need to connect it to something to read the codes.
It is running fine, but the engine doesn't seem to shut off and mpg in city is kind a like a normal car, and I think the battery drains too fast. No matter how slow I take off it won't use the electric motor alone. I wonder if that is the battery causing engine to have to stay on.
It keeps cycling off and on charging the battery, but engine never shuts off.
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This morning I realized that there is a pattern to our Prius incidents. What Sarah experienced last week is the same that Amy experienced when she drove the car the first day we bought it.
1. January: Amy had driven 20 highway miles with no problem. Park for 10 minutes. Started and crossed to the median of a two-lane Highway. stopped to wait. When tried to go, nothing. Will not move. 10 minutes later tried again and car worked fine for a long time after that.
1a. The car still had the original auxiliary battery. tested and found 12V battery weak. Replaced original battery with Duracell AGM vented battery for Prius. Car drove fine for weeks after this.
2. May: car sat all day. Turn on. Drove across parking lot. then noticed red triangle, VSC, brake warning lights all on. Lots of codes including high-voltage battery, transmission, and others.
3. drove fine for one week. Then going 60 miles per hour up a slight hill. heard the internal combustion engine shutdown. Red triangle, VSC, brake warning light came on. Reduced or no power steering or brakes. Coasted off the road. After 10 minutes, it drove fine again.
3a. I cleaned high voltage battery cooling fan. Drove fine for 10 days.
4. June: Sarah drove 10 minutes. Drove to stop sign. Had to wait 5 minutes for lots of traffic. When ready to pull out, push the accelerator, internal combustion engine shut down and the car would not move. Would not go into reverse. Put in neutral, and enough slope to roll backward to side of road. waited a few minutes, and it drove fine again.
Codes WERE P0A0F engine failed to start and c1300 anti-lock brake. the same codes were thrown in the previous incident. Noticed engine coolant a little low and added more.
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How do you warm up? I turn it on and it might start the engine for a few seconds then shut off... How do I know it's ready and warm?
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Cluster dead. Held power button for 3 seconds. Engine shuts off but MFD stays on and green power stays on too. I've tried holding the power button for 20+ seconds. I can restart the car normally and and the engine starts up. Holding the power button for 3+ seconds turns the engine back off, but not completely. When I walk away from the car, it complains I'm leaving with the key and beeps at me. It's still powered on in my garage.
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Today when I got home I put my 2007 Prius in Park and the engine shut off. Why this happened?
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My 2001 Prius makes this sound when the engine is running. All the battery lights are on all the time, I think it needs a new HV battery but I'm not sure if it's worth it. Perhaps the other battery is faulty I really don't know. All the engine lights are on and if the brake light comes on it starts shaking or the power steering fails or it just completely shuts off on the road no lights no power steering nothing. When that happens I use a battery booster that I keep in my trunk to get it going again but it's really dangerous to drive now.
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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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After starting my Prius the engine was knocking and shaking. After running the engine for 30 - 45 seconds it operated normally. The car is always parked in our garage and the outside temperature was approx 32 degrees or a few colder. I have 30750 miles on the car.
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Just DIY'd the first oil change on my new 2013 Prius at 2100 miles. When I first started the engine after the oil change, it was knocking and sounded a little rough for about 5-10 seconds.
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I had a toyota prius gen 3 last year where it had an engine knocking sound, where I tried every TSB and changed the spark plugs, spark plug cables, intake manifold, engine knots..... etc., nothing worked except the following video which solved the knocking completely with no return.
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I just turned 3000 miles on my C. I started the car and the engine chugged and knocked like I have never experienced. I turned off the engine and restarted and no problem.
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Yesterday, while at the store. I started my 2004 prius and the engine was making some crazy knocking noises. I went to auto zone and pulled the codes. It said random cylinder misfire and misfire on cylinders 2,3, and 4.
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I took my car for the engine knocking at 34xxx miles to the dealer here in NJ. They mentioned it was the EGR that was clogged, so they replaced it. 2 weeks after that, the same incident happened whenever it wasn't allowed to warm up. This time the dealer diagnosed it with having a hole in piston #1? To make the story short, i received my car 2 days ago with a brand new engine from toyota. I tried to re-create the same issue, and it would not happen. Could this be resolved once and for all.
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I just turned 3000 miles on my C. I started the car and the engine chugged and knocked like I have never experienced. I turned off the engine and restarted and no problem. What gives?
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Initially thought that this was related to some water in the tank, since it started when the gas dropped to 1 bar (already put some stuff HEET when put the whole tank, did 60miles so far). ODB throws out multiple cylinder misfire (codes 300, 301, 302, 303 etc). It lasts up to 3 seconds. Sometimes the check engine pops up sometimes it doesn't. there was absolutely no problem under load. does it seem like a fairly common problem ? Intake manifold clogged ?
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I started my Gen 4 Prius two yesterday and got out to adjust a bolt on the rear license plate and noticed a strange sound as the ICE in high throttle began the warm-up cycle- a sound like water sloshing around in the cat converter (or somewhere upstream?). Other new Gen 4 owners please check this and see if you hear this on startup. It is not regular enough a sound to be engine knocking, but literally like water churning. Not loud enough to hear from anywhere but right near the lower rear of the car. Hear this on new 2016? My Gen 3 never had this sound.
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A few months back, I posted a problem with my '01 prius: engine knocking for @30 sec when first starting up. Does NOT happen on first start of day, only on subsequent ones. Random misfires not corrected by changing coils/plug. It's been in the shop for awhile, and no diagnosis. I'm ready to sell the thing, unless there is a quick fix. New hybrid battery 20# miles ago; used transaxle 10# miles ago (with 1.5 yrs left on 2 yr warranty); new tires 10 miles ago. Has 185,000 miles.
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Sometimes I have to park my car two blocks away in the afternoon, and later in the evening i need to park my car back to the spots in front of my apartment.
EV mode won't be enough to last the two blocks, even at 7 bars. Or sometimes the car won't let me turn on EV mode, even at 7 bars (battery too cold).
So the engine must run if i want to park my car back near my apartment. But the two block distance will not suffice to completely warm up the engine
So the next morning... (20~ Fahrenheit)
My car knocks for a few seconds the next morning the car starts up...
What is the definition of completing the warm up cycle? 120F? My car will turn off the engine after coolant temp reaches 120F (ECO mode).
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I have a 2010 Toyota Prius. The other day I was stuck in a traffic jam - under 5 mph for at least 30 minutes.....my engine started knocking/vibrating...once out of the jam, it felt like the engine was "missing"....I took it to the Toyota dealer in town and they changed the spark plugs and cleaned the area...the car runs a little better but I was in a funeral procession yesterday and after about 15 minutes the car was knocking again. What the problem could be? The mileage on the car is 125,000 (I drive a lot!)...
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