What makes car idle high

Privacy Policy. Prevent unauthorized vehicle use, risky driving, and driver inefficiencies. Fleet related industry news, tips, and insights to help manage your fleet. Login Pricing August 26, Post Share. Recent Posts. Route Optimization Software Tips for 3 min read. What is Dynamic Route Optimization 3 min read. No spam ever. Read our Privacy Policy. August 5, Fleet Management. November 3, Fleet Manitenance.

August 11, Once you correct any leaks see if idle improves. My car is toyota mark II. When I start the engine rpm was was too high even the gear was parking. When I change the gear to drive mode, then engine rpm was reduce. Please be advice me. It could be a vacuum leak, but engines also tend to rev higher on cold start. It helps warm up the catalytic converter. I have a Toyota Celica the rpms is fine intill I get up to 80mph then it wants to stay over What could this possibility be?

It might just be the way that car is geared. Shorter gears mean higher engine speeds for a given ground speed. My Miata definitely sits around 4k RPM on the freeway and this is normal. I have a ford focus 1. If I keep my foot on the gas pedal then engine will keep running but rough as if off a cylinder. Changed plugs, ignition coils, air filter,throttle body and intake manifold cleaned out, made no difference, engine check light is on but not getting any codes on my scanner.

Has the timing belt been changed recently? One other cause of the symptoms you describe is incorrect timing. If the belt skipped a tooth, it would certainly cause a rough idle. If the ignition timing needs adjusting, you may also experience similar symptoms. I would do some more testing before throwing any more parts at it. That game gets expensive pretty quickly. I am having the same problem with my Malibu for the last month.

My car idles high and will speed up to 40 miles an hour by itself. The RPM runs up between 2 and 3. I took it to the dealer and since the check engine light does not come on they are unable to figure anything out.

They did say the got an alert that some gas stations are selling winter gas instead of summer gas. Never heard of such a thing. It sounds like something is holding the throttle plate partially open, which could be very dangerous if it gets worse. A stuck throttle could lead to unintended acceleration.

I would avoid driving the car until the issue is fixed. If your throttle does get stuck, be aware that you should still be able to shift into neutral. Just bump the shift lever into neutral and pull over immediately when it is safe to do so. The engine will make a lot of noise, but it is always better to lose an engine than your life. Any suggestions? I have a Dodge Journey Crew, Going high way speed Rpm was close to redlining just to pick up to 70mph from 60 mph with light gas.!

It depends on how the ECU is tuned. Does it feel like the transmission is slipping, leading to high RPM? Is it downshifting to get to redline?

I have a Elantra it just started revving high this week at normal speeds. Around 3 grand and louder than usual. Wonder what that could be? Hi, I have been to plenty of mechanics even to honda dealership because my rpm sticks at even taking the foot off gas pedal and rpm will go up at and when braking the car will stop but the rpm wil jump up again causes vehicle to shake.

No one is able to figure out the exact problems there no vaccum leaks. IDK if alternator should cause this problem. Keep digging and see what else you can learn from testing various components. Caps only last years. Causes misfires, smoke, bad timing, fuel overuse, and so on. Even transmission shift issues. I have a cruze. What's fastest? A look at the history of electric vehicles and two of the main options today, the Chevy Bolt and Tesla Model 3.

Car flipping tips from an experienced successful flipper. What cars to buy, where to buy them. How to check them out. Do you need a license? Diagnose a stuck caliper and avoid a potential road accident. Living full time in an RV sounds like fun. Let's see When life spins out of control and you are overwhelmed with debt and bills, bailing out and reducing your living costs may be the only chance you have.

I was forced to live full time in an RV to survive. I will break down the associated costs. If you're thinking of buying a classic VW Beetle, you need to know a few things beforehand. Discover why the best bargain to be had is from someone who doesn't know he wants to sell.

Learn about the EGR valve location in your vehicle with this practical guide, whether yours is vacuum or electronically operated. Here are some precautions drivers and passengers can take to avoid being injured by airbag deployment. Will a used camper shell fit your truck? This article will help you choose the best shell for your truck and what to look out for in a used shell. Have you ever looked at your car and seen that bubbled paint on the edge of your fender?

Follow along as I cover the steps to easily repair this common problem. From sanding to priming and finally painting and clear coat. I will provide an easy, step by step guide with a list of products I used. If you are looking to upgrade your stock motorcycle, then here are the best beginner-friendly mods that are fast, easy, and affordable to perform. Auto Repair. DIY Auto Repair. RV Living. Safe Driving. Learning to Drive. All-Terrain Vehicles. Commercial Vehicles. Automotive Industry. Loud engine — A faster revving engine will produce much more noise when your car is idling.

This is sometimes accompanied by shaking. A high idle level can point to several different problems. These include:. The idle control valve ensures that the engine runs at the correct level while idling. Over time, the valve or its control circuit can fail, causing the engine to run at high rpm when the car is idling. The idle control valve is connected to a fuse.

If this fuse blows, the valve will not receive any power, causing it to not work at all. If the sensors send incorrect signals to the computer, an excess amount of fuel or air may be added to the engine. This can result in a rich fuel mixture, causing the engine to idle roughly. If a vacuum leak occurs, extra oxygen will enter the vehicle.

In order to keep a healthy balance of fuel and oxygen, more fuel will be added, resulting in a loud, rough idle. The electrical load detection circuit is designed to send a signal to the engine ECU when additional electrical loads are activated on the vehicle electrical system. This is because these extra electrical loads take extra energy from the engines alternator, which can slow the engine rpm down.