Usually, when the problem is in the air control valve inside the engine, cleaning this piece correctly could fix the problem. In cases where the piece is too damaged to clean, you would need to replace the piece entirely.
For more, read how to control a car engine safely. For more, read reasons why a car jerks when accelerating. Share on:. By Max. D Gray. May 2, You may also be interested in: Why is My Car Jerking? The Echo sounds like a vacuum problem ; there is a leak, possibly in the air intake, and the computer compensates for the lack of vacuum by opening the butterfly valve, rather than using the idle circuit when idling.
The Tracer is a Mazda, and unrelated to the Taurus. The recent Toyota recall was for a plastic accelerator pedal that lacked a nylon bushing to "save" money and so would "stick" on the mould line of the two parts of the pedal.
Once the engine starting running flat out, the transmission selector could not move because the high fluid pressure prevented the spool valves in the control block from shifting, and the brakes were ineffective normally, the transmission will slip into neutral when the brakes are applied, but the high fluid pressure prevented this.
Worsens after highway driving. Has been occurring for over 2 years. This does not occur when driving the vehicle in 3rd gear.
It has been happening for about 1 week and getting worse. This began yesterday. Any ideas will be greatly appreciated! I just want to know what I might be looking at before taking it in to the shop : Thank you, Kristine. I drive a Hyundai Elantra 5 speed standard.
When i bought the car it was in great condition, about 6 months after it started surging on me when i was in neutral and would go from about RPM to about RPM and then drop and spike repeatedly.
I drove it for a while, had a bad clutch on the car so id just leave it in gear and with my foot barely on the clutch it would idle at about RPM like normal. A few months after that it stopped spiking and just would climb from up to when idling. I just got a brand new clutch installed in my car and obviously my cheat way of getting it to stop is absolutely not an option anymore.
Anyone have any idea what it could be? Vacuum leak crossed my mind as the head gasket needs to be replaced. Checked the throttle cable. I literally have to turn my car off at lights if i need to drive anywhere! I need some help to get this diagnosed so i can fix it as soon as possible.
If your vehicle is beta1 1. If your vehicle is beta2 you have mechanical lash adjusters. Without the proper adjustment, or due to valve sticking, compression gases can leak back up into the air inlet manifold, increase the pressure, confuse the control computer that it's because the driver has opened the throttle wide and so it may choose to add more fuel.
Surges are the result. I remark "may" because most control computers are equipped with a throttle position sensor to know where you really put the throttle , yet, believe it or with difficulty, some control boxes' softwares place more influence or emphasis on the inlet manifold pressure anyway, as if more important than where you place your foot. On some vehicles with the MAP manifold air pressure sensor, it's possible to simply disconnect it, to get to a garage or safe place. On the Daewoo the MAP is right on top of the engine, just underneath the hood.
The engine restarts in a more basic, less, um, nervous mode called TP. Hyundai may be similar or identical. Garage techs do know of problems with valves on your model and even shim them. It's like the sixties! Here is a link that might be useful: valve adjustment still matters. My new Jeep wrangler suddenly accelerated on the highway last week. We were driving for about an hour when there was a click feeling under my foot that my right was resting on our gas pedal keeping the speed.
Directly after that click feeling I then noticed the speed increasing as the pedal moved away from my foot and depressed? The engine began accelerating. I had not even figured out the cruise control nor am I a fan of it since we lived in a congested area. I thought that the cruise control somehow thought it was in control?
So I Tapped the brakes. This caused a slight pause in the Jeep's climbing acceleration until I released the tap and the car surged forward.
Climbing to speeds above 70 I began to roll through my options as I depressed the break hard. The car slowed a bit to dip below Again I tried to release again the break whilst I and noticed the gauge and the throttle was in the red and climbing via the dial on the dash.
No other illuminations giving me a clue. I began to both depress the break and pull the emergency break simultaneously. Then the car slowed allowing me to pull over to the emergency lane to turn off the engine. The gas pedal was completely depressed. Stuck to the floor prior to turning the engine off. There was no floor interference as our mats are buttoned in with a peg system. Both my passenger and I visibly could see the pedal was flush to the floor.
Nothing was inhibiting the release. It was like pulled in? I tried to squeeze the tip of my sneaker under the pedal. Zero room to do so. Just as I was turning off the engine the dash illuminated a red lightning bolt? Once the care was off the pedal released. I turned on the car and everything was reset? I called for a tow. Car still at dealer. Never heard of this happening I was told by both. Any ideas? I am in my 40's and quite healthy and a corporate software executive and drive approximately 30k per year.
I know these cars have computer dependent systems. I am thinking something was not tripped to allow me to regain the throttle? This is my second Jeep. Last one was purchased in I have no ideas. That way everything will be on file. And also it will be added to any other incidents if there are any. Good Luck. Thanks Bob. Already filed a report. Ok can some one please help me i have been having trouble with my car and i dont know what is going on.
First it started the one day when i backed up in the drive way and then put in park the car sat there like i had the foot on the gas then the rpms were up to 2 so then i turned it off and started it back up it was fine. Well now my car sits at a light and the rpms go up and down and the car sits there like i have my foot on the gas and i dont.
Also it shakes a little when sitting it dont ride smooth. And the last part when i am driving some times like at a light i will take my foot off the break and the car will start moving on its on i dont know what to do help please. I just drove my Hyundai Sante Fe home from the dealership for having a recall fix. New cylinder cover gasket and alternator. On the way home the car suddenly accelerated, full throttle. After forcing the vehicle into neutral and turning off the engine, I let the car stop on the shoulder.
I restarted the car, and it idled just fine. I then carefully and gently applied the accelerator, and when I reached 30 mph it shot up to full throttle instantly. Again, I put the car in neutral and turned it off and glided into the nearby Holiday service station. My Hyundai dealer sent out a manager and a mechanic. He tightened up a couple of grounds and found the accordion style rubber manifold tube going to the MAP sensor was off the manifold.
He put it on securely and everything operated correctly. I can speculate some one leaned on the air sensor mechanism and unsecured the rubber air vacuum tube to the manifold. Now this tube is a firm rubber tube that held itself onto the manifold connector.
However, after I drove for a half hour or so, the rubber softened from the engine heat. The engine moved under torque creating a vacuum leak allowing more air into the MAP sensor which told the EMC to send more fuel which resulted the car immediately accelerating to full speed. Once this was secured, no vacuum leak, no more problem. Please note there was no problem until the rubber hose heated up and softened as the accordion style put enough pressure on the connector, holding it in place up to the point of sudden acceleration a half hour into my trip home.
I suggest everyone check this connection to assure this does not occur to them. Also, I am going to ask the dealer to have their mechanics check this before releasing the car from the shop. Lives depend on it. My wife would have not had any idea how to stop the vehicle in this situation and the results could have been tragic. I have a Chevy s10 and its doing some weird stuff. When I'm parked the engine revs on its own and when I begging to go its like I don't have to press the gas at all and it will start going up to 20 mph.
I have a Jeep Liberty with the same symptoms, high acceleration at IDLE and would let go off the pedal on the freeway and it would keep going the same speed or higher. I read these posting and replaced the idle air control valve and the symptoms were fixed. Have a 97 BMW i It is accelerating while in park and driving on the road by its self.. It accelerates very quick and lots of power behind it. Could you please give similar fixing solutions to this problem..
Its very dangerous It is a Chrysler LHS and the random accelerating just started happening last week. My father checked under the hood, and checked for something causing the gas pedal to stick and nothing came of that.
My dad sprayed underneath the hood I believe with WD We took the car to a repair shop and they took about two days not including the weekend due to being closed and today called and said they repaired it and took it for a test drive and the problem was all fixed, but as soon as my boyfriend went to drive it he said it felt like it was just accelerating more than before and this time more forcefully.
I know this is a very old post but I just have to say that turning the car off is the absolute worst thing you can do, because it will stop the power steering and power brakes. The best thing to do is to put the car in neutral, and apply the brakes, while you are steering the car to the side of the road. If you can, get your emergency lights on. Only when you are on the side of the road do you pull the emergency break and turn the car off if it still didn't stop.
Hopefully, the car will have slowed down some when you do this. Does your car have cruise control? It could be a malfunction with the cruise control since it is also has wires running to the accelerator. My mother's car kept doing that until we found out that she had the switch on without realizing it. Even though you are supposed to push the reset to regain the speed after breaking, for some reason her car wasn't doing that and would just take off on it's own.
In her car's case it wasn't even a fix. It was simply a matter of turning the switch off and making sure it stayed off. The placement for that switch is on the same knob as the directional and the wipers. Very easy to inadvertently switch it on. That's why newer cars have cruise control in an area that can't get mixed up with other functions.
I'd have them check that out too. If they think that is the problem they could pull that wire from the accelerator and disable cruise control. I was driving around doing errands and then came home. I was pulling into a parking spot at our apartments when the issue happened. I had my foot on the brake and was nearly at a complete stop when my engine revved and jumped over the curb and into the apartment wall.
With it being only 15 feet, I didn't have a huge speed and the airbag didn't deploy thank goodness. I have had people ask me if I didn't have my foot on the gas. Well, how could I since I was at a near stop and hadn't moved my foot off the break? I do know I stomped the break harder when it started speeding back up.
I did not think to pull the emergency or put it in neutral. I have it in the shop getting the body fixed. But what do you think? Is this computer related possibly? I am scared to drive my children in it and am in a pickle with buying a new car. My car started doing the same thing today. Jay Safford Automotive Mechanic. The statements expressed above are only for informational purposes and should be independently verified.
Please see our terms of service for more details. Home Questions. Experienced Mechanic? Apply Now. What others are asking What should I know about checking tire pressure? It can affect everything from the life of your tires to how your car handles on the road, your fuel economy and much more.
Read more. Car has sat for 5 years and will not start. When a vehicle sits for this long there can be a number of issues keeping it from starting and running right. You do need to replace the battery,and you should replace all of the fluids before starting it and Gear shift lever stuck in neutral Hi there. If the gear shift lever will not move then the shifter assembly has more than likely failed. It is common for the shift interlock solenoid to fail and lock the shifter in place, or for the shift cable
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