I have 2011 RX AWD and noticed when driving downhill and braking, car will shake. It feels like the wheels are shaking but the steering wheel does not. Is it rotors or something else?
Also RX is certified pre owned warranty for another 30k miles and I want to do alignment on it but not sure if warranty will cover that ?
My 2002 v6 camry is shaking while braking on a downhill at highway speed 60mph. This started yesterday. Afterwards on level surface and lower speed no shaking. Late yesterday, again on highway downhill, more shaking.
I live on a mountain and do not notice the shaking coming down at 30mph, including yesterday.
A couple of months ago the pads were 75% and the rotors were resurfaced approx 4000 miles ago. And the rotors are the third pair if i remember correctly.
I bought the car new and it has 121000 miles on it.
Curiosity question. I've noticed that on a downhill of a couple miles, especially in "braking" mode or with the cruise control on, the motor/generator and engine are used to keep the speed down and the battery gets charged to the very top quite quickly. That's good!
On a really long downhill, will the motor/generator still be used for braking and the excess electricity discarded to keep from overcharging the battery?
I have had 2 gx470's perfect - new 2011 gx460 constantly vibrating when driving. Michelin tires perfect not the tires they are saying this is the way they feel. Now impossible - constantly feeling the road and all shaking.
View 14 RepliesI think that the EV indicator works very strangely on my 2015 Prius. Consider this: I'm driving downhill at 40mph and the EV indicator is on. As my speed increases (coasting the whole way - using neither the accelerator nor the breaks) and crosses 46mph, the EV indicator goes out. Why? I saw somewhere in the forums that 47mph is too fast for the motor-generator, and so it switches off --- but my real-time mpg indicator still shows 100mpg, which wouldn't seem to be the case if the Internal Combustion Engine has just kicked in. Why the EV indicator goes out? Should I even care?
View 5 RepliesI Locked Differentials and put DAC on, but still car was Skidding while going downhill . Do I have to select any other options that will work with this skidding issue?
View 14 RepliesI have no speed control going downhill with CC at all. Dealer says this is normal. I've had two other Lexus GS models and when going downhill they would downshift and use the engine to maintain a constant speed. My Mercedes does the same thing when going downhill it downshifts to maintain a relatively constant speed. Is this normal with the RX? if so, what a disappointment.
View 1 RepliesLately my 2007 GX470's steering wheel has a shaking/vibrating problem whenever I apply the brake at speed above 50 mph or so. Without braking or with braking at slower speed, there is no problem at all -- everything is glass smooth.
1. I assume the front brake rotor is warped?
2. Will I need to change the rotor or is there a way to fix the warp (it that's the problem) without changing the rotor?
3. Approximate part & labor cost?
I plan to bring to dealer for a check up but would like to know ahead of time what to expect.
There is a mile of downhill on my way to work every day. I oberseved that when I step on the brake to slow down, the RPM jumps from 2000 to 4000 all of a sudden and stay there for a few second. Without my foot on the brake, the tachometer stays around 2000 rpm. Is it normal? Why does the engine do this?
View 3 RepliesRight now my husband and I are driving from San Luis Obispo Ca to LA and back in a day. We noticed right before the grape vine on the I5 that the engine was really working, even on flat ground. Looked at the battery and it was purple. We have been driving for about 2 hours averaging about 70mph on mostly flat land. The battery finally charged itself on the big downhill of the grapevine (I5) but we're noticing we're running right through it again unless we start to break more. So, it's not getting any recharge during driving, just breaking. Can it be the generator? What causes this?
View 5 RepliesSo my 4motion downshifts going downhill while braking...it's annoying as hell! My DSG used to do the same thing but being a faster tranny it was actually NOT annoying... Is there a way to reflash the tranny software? Maybe with an older code because my 06 didn't do this but my 08 does...
View 5 RepliesI have noticed a couple times now on my Automatic S that the engine keeps revving an additional 1,000 - 2,000 rpms when I am braking going down a hill. Is this normal? It doesn't occur on flat roads or going uphill, but only downhill. It's almost as if it downshifts when I brake. Not sure if this is normal or not, but it just didn't feel right.
View 3 RepliesMy 07 prius with 190k started shaking violently when going down hill if I press the gas or brake at all is goes a way suddenly, this happens only around the high 40's to low 50 mph range and once at 75, this happened just after my tires where balanced and rotated brought it back they re balanced them and said they balanced out perfectly and the problem still protested. I drive on dirt roads all the time and i hit a big pot hole earlier last spring but the issue just started after the balance a week ago.
View 13 RepliesI've been mostly content with my Prius Plug-in for nearly a year now. But, as a driver very consciously aware of what my car is doing, I have many complaints concerning the internal combustion engine igniting when not needed, or remaining on for far too long. I do my best to work around them, but I feel the need to enumerate my complaints and vent about them. Note I live in southern California where cold weather is extremely rare, and I consciously don't use the heater or AC.
ICE ignites when braking downhill on a full charge. I've heard users say this is necessary because if the battery is full, regenerative braking will overcharge the battery.
ICE ignites if I step on the accelerator ever so slightly too hard. I understand that Toyota claims it needs to use ICE to deliver the extra power to the wheels asked for by the driver, but I just don't believe that. The engine usually simply idles and does not power the wheels at all when this happens, meanwhile the wheels are still running on 100% EV power. I know this because I've become in tune to exactly when the ICE powers the wheels and when it's not. The easiest sign of ICE actually powering wheels is when the accelerator begins to vibrate and I hear the ICE rev up. The second sign is by watching the MPG meter. If you're cruising at something like 50 MPH, and the ICE is idling, you'll see it getting about 80-90 MPG. When it actually supplies useful power, it suddenly drops down to 50 or below.
ICE ignites if the car moves faster than 65 MPH. This seems totally arbitrary to me. For example, it does not matter if you're accelerating steep downhill in neutral, or on a level highway just very slowly accelerating past 65. You can watch the power meter the whole time, and even if it doesn't get anywhere near the (power) section to the far right, the ICE still ignites as soon as you hit 66. In those situations, why does it even think it needs any extra power? And to top it all off, all it really does is idle for at least a minute anyway.
The ICE runs only momentarily, but here's the kicker: If you immediately let go of the accelerator, decelerate to below 65 MPH, or even come to a full stop at a red light, the ICE still continues to run for at least a minute or two. Worse still, it idles for about a minute regardless of speed or power, then suddenly decides that it should power the wheels for a few seconds even if no variables have changed, and it does this for about 30 seconds more before finally deciding to suddenly pop back into pure EV mode. How you work around all of this? Stop at a red light, shut off the car, and restart it. As it powers on, it stays in EV mode, proving to you that it never needed to be sitting there idling in the first place.
I have a 1995 Oldsmobile 98 sedan with engine braking problems. It has the 3800 engine (complete with a slight intake manifold leak, as per the GM custom) and low miles. I recently moved from the midwest to the west coast, where this battleship encountered real mountains for the first time on the road trip west. Driving into Yellowstone NP from Cody, Wyoming I encountered a particularly hilly stretch of US highway that had a steep grade and plenty of curves down the hill.
I took the car out of overdrive and put it down a gear to let the engine braking assist. Nothing happened. The car continued to speed up with no assistance from the engine, even in 2nd, which should have held me at around 45-50. To test this on the next big drop, I started at the top from a full stop, and in first gear. I should have been walking down the mountain, but instead the car kept speeding up to around 40 and 4000 rpms before I relented and shifted up.
Is this a transmission problem? Or would the lack of engine braking downhill but no transmission problems when tooling around town elsewhere indicate something else? Maybe a vacuum leak?
Have a 2011 Toyota Sienna with about 50k. Ive been having this problem for over a year but was not very noticeable. But in the last several months, the shudder has increased and the car shakes a good deal when I brake downhill.
The problem does not happen on a flat surface or downhill.
I did some online search and some seem to point to warped brake rotors. Is that likely? Also more importantly, how dangerous is it to drive more in this condition? From where we live we need to negotiate steep downhill every day.
I drive a 2005 Ford Explorer (automatic) with 84k miles on it. Recently when I was driving on cruise control at 35 mp/h down a hill and applied the breaks to make a turn, the engine completely shut off. The lights came on, the power steering went off, the engine had shut off. I pulled over, turned the key off, turned it back on and it started no problem. I drove it for 3 days without problems (and without using cruise control of course), then I took the car to a shop. They ran diagnostics on it, test drove it, but couldn't find anything wrong with the cruise control or the transmission. I don't think they tested this driving downhill as the shop is not in a hilly area. Tonight, I went down the same road again, 35 mp/h in cruise control, slowed down for the same turn, and the engine shut off again exactly the same way it did before. What this could be?
View 7 RepliesI'm a new owner to my first 4x4 vehicle. My vehicle is a 2007 f150 xlt. Today while I was driving into work I had my vehicle in 4wd high. As I was going down hill I let off the gas and started braking. When all of a sudden my 4wd drive switched into neutral. I am wondering what could cause this to happen and whether it's an issue or not? It is snowing which was my purpose for being in 4wd.
View 9 RepliesI have a 2010 prius and today when i was driving the car it started shaking every time I brake and after a little bit. I realized that the car was having trouble shifting from battery to engine and engine to battery and once the battery runs out the car shuts off and when I start it again it starts in engine mode and charges the battery..
View 7 RepliesThe surface of all four of my alloy wheels on my 2010 RX 350 are peeling. Why?
View 5 RepliesJust wondering if there is any difference between the RX350 and RX450h wheels. Given that the RX450h is a hybrid, the wheels should be lighter for better fuel performance.
View 1 Replies