Why does my car Rev at high idle?
Sometimes the engine starts revving high uncontrollably. It doesn’t happen all the time, but when it does happen, it does it sometimes when I start the car, or when i’m driving down the road, or when i’m sitting at a stop light. I tried replacing the idle air control valve and the throttle positioning sensor, but it still does it.
Is it normal to have a rough idle?
This is definitely not a normal situation. If you are experiencing a rough idle or your RPM is running high, then there are a variety of reasons for why this could be happening. It is not always easy to diagnose the cause because there are so many factors involved here. Below are the top 5 causes that a mechanic would look for.
What’s the difference between high idle and low idle?
Step by step automotive repair guide on how to troubleshoot and fix an engine that is idling high (fast) or low (slow). (Note: The engine idle speed is controlled by the computer and is NOT adjustable.)
What should the rate of revolutions be on an idle engine?
When you start your engine, and just let it run without pressing on the accelerator or putting it into gear, that is idling. A properly idling engine should be able to maintain a steady but low rate of revolutions, somewhere in the vicinity of 1,000 RPM. Your tachometer needle should be steady and not jumping around.
Sometimes the engine starts revving high uncontrollably. It doesn’t happen all the time, but when it does happen, it does it sometimes when I start the car, or when i’m driving down the road, or when i’m sitting at a stop light. I tried replacing the idle air control valve and the throttle positioning sensor, but it still does it.
This is definitely not a normal situation. If you are experiencing a rough idle or your RPM is running high, then there are a variety of reasons for why this could be happening. It is not always easy to diagnose the cause because there are so many factors involved here. Below are the top 5 causes that a mechanic would look for.
Step by step automotive repair guide on how to troubleshoot and fix an engine that is idling high (fast) or low (slow). (Note: The engine idle speed is controlled by the computer and is NOT adjustable.)
When you start your engine, and just let it run without pressing on the accelerator or putting it into gear, that is idling. A properly idling engine should be able to maintain a steady but low rate of revolutions, somewhere in the vicinity of 1,000 RPM. Your tachometer needle should be steady and not jumping around.
What’s the idle speed of a Pontiac Grand Am?
The car idles at between 1500 and 2500 RPMs and if you put it in drive and let off the brake, it’ll get up to about 40-45 mph on its own. I followed behind her on the way home and she was riding the brake practically the whole time. At first it happened every so often, put lately its been happening more and more frequently.
What happens when the idle control valve fails?
When the idle control valve fails it can cause all sorts of issues with the vehicle, and in some cases may even render it undrivable. Usually a bad or failing idle control valve will produce a few symptoms that can alert the driver of a potential issue. 1. Irregular idle speed
Why does my Grand Am engine rev high?
I have a 2003 Pontiac Grand Am 3.4 liter. Sometimes the engine starts revving high uncontrollably. It doesn’t happen all the time, but when it does happen, it does it sometimes when I start the car, or when i’m driving down the road, or when i’m sitting at a stop light.
Why does my car idle at 1500 rpm?
No more stuttering or hesitation in lower gears at 1250 – 1500 rpm. Idles like new. Advise checking electrical connections especially if vehicle lives outside in damp climate. Was this answer helpful? Well after going to the shop and running codes, and testing various things physically.
How can I tell if my idle control motor is working?
Look for a difference in idle speed. Allow the engine to run for a minute so it settles to a consistent idle, then take note of any difference in the idle RPMs versus the idle you observed earlier. If the idle has not changed at all, it’s likely because your idle control motor has not been functioning.
Can a bad idle control valve cause stalling?
This is controlled by the engine’s computer. Sometimes parts go bad, which results in your car idling strangely or stalling. Check to see if your idle control valve is functioning properly before attempting to replace it. Look for a high engine idle. A common symptom of a faulty idle control valve can be a high idle.
Why does the Check Engine light come on when the engine is idle?
The check engine light in your vehicle is designed to turn on if the Engine Control Unit (ECU) identifies an issues with how the engine is running. Look at your dashboard; if the check engine light is on in conjunction with idle issues, it may be because the idle control valve is malfunctioning.