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Why does my Honda Civic Idle so high?

Posted on by Arif Clayton

Why does my Honda Civic Idle so high?

Malfunctioning Throttle: A malfunctioning throttle system can cause both a high or low idle as well as an engine stall. A dirty air intake or cracked air intake tube is often the culprit.

Why does my Honda Civic Idle up and down?

If your idling fluctuates up and down during cold start and goes away after operating temp is met, your Fast Idle Thermal Valve has backed out. If your idling fluctuates up and down during operating temp, then it is most likely the IACV. The MAF sensor measures the amount of air flowing through the throttle valve.

What RPM should a Honda Civic Idle at?

Idle RPM spec is 700 +/- 50 at operating temperature in park or neutral so that doesn’t really look far off.

Why is my Honda Civic having Idle problems?

Continue reading to find out what can cause your Civic to have idling problems. A car with a vacuum leak can cause an unstable idle. An unplugged vacuum line (as well as a damaged air intake hose) creates discrepancy between how much air the engine’s computer thinks it has, and how much it actually has.

How can I tell if my Honda Civic has a vacuum leak?

The easy way to find out if there is a vacuum leak is to spray the hoses with starter fluid or brake cleaner. Make sure this is done on a cool engine. If any of the hoses are cracked or not sealed correctly, they’ll suck in the vapor and the car’s idle will change. This should help you find the general location of a leak.

Why is the idle speed of my car so high?

Step 2 – The idle air control motor (valve) is responsible for controlling the engine idle speed, if this part fails or becomes weak the engine idle speed could become erratic, additionally, this condition may or may not trigger the MIL (check engine, service engine soon light.)

What do you do when your Honda engine is at idle?

An easy way to find one of these faulty PCV valves is to pinch off the supply line to the PCV valve with a pair of pliers while the engine is at idle. If the idle smoothes out when you do this, replace the PCV valve with an OE unit.

Why does my Honda Civic run rough at idle?

Low oil levels would cause the idle roughness, and low coolant levels would cause the engine to run hot as well as rough. To check if the fluid levels are low, let the car sit until the engine is cold. Let it sit for a few hours until the motor is cool to the touch.

What are the symptoms of a 1995 civic?

The symptoms are: – Idles at just above 0 RPM, all the time (on start, hot, cold, wet, dry, etc) – During acceleration, the scar sputters (as if water were in the gas or something)

Why does my car idle all the time?

If the computerized engine control system is faulty, high idling can be one symptom. A vacuum leak in any of the hoses can be the culprit—inspect them all for leaks. A bad idle-speed control unit can cause the problem; it may need to be replaced.

What to do if your Honda Civic is shaking?

Let it sit for a few hours until the motor is cool to the touch. Remove the oil dipstick, and check for an appropriate fluid level. Then, check the the coolant reservoir for color, quality, and the appropriate level of the coolant. Top off or replace the engine oil or coolant as needed. Figure 1. Low coolant and grey deposits in the radiator.

Why does my Honda Civic idle so high?

Posted on by Arif Clayton

Why does my Honda Civic idle so high?

The result is a lopey idle, or a car that won’t start. Typically, a vacuum leak of some sort will result in a high idle above 500 rpm. The easy way to find out if there is a vacuum leak is to spray the hoses with starter fluid or brake cleaner. Make sure this is done on a cool engine.

What do you do when your Honda Idles?

If you’re sure you don’t have any vacuum leaks and you’ve bled the air out of the cooling system and you still have a problem then check the IAC (Idle Air Control valve). You can do this by tapping on it with the butt of a screwdriver while the engine is running. If the idle changes or stumbles in some way you may need to replace it.

Why is my Honda Civic engine surging up and down?

#1- Cold Start. If you start the Engine and the Engine started Surging Up / Down ” Right Away ” during ” Idling “. A. Your IACV is either ” STUCK or BROKEN “. You can try to ” Unstuck it ” by cleaning it with Carburetor Cleaner to save $$$, after that put it back and it still not normal / unsuccessful, replacement is a must! #2- Warm / Hot.

What causes your car idling speed to be too high?

If the computerized engine control system is faulty, high idling can be one symptom. A vacuum leak in any of the hoses can be the culprit—inspect them all for leaks.

The result is a lopey idle, or a car that won’t start. Typically, a vacuum leak of some sort will result in a high idle above 500 rpm. The easy way to find out if there is a vacuum leak is to spray the hoses with starter fluid or brake cleaner. Make sure this is done on a cool engine.

What to do when your Honda Idles down?

If you’re sure you don’t have any vacuum leaks, and you’ve bled the air out of the cooling system, and you still have a problem, then check the IAC (Idle Air Control valve). You can do this by tapping on it with the butt of a screwdriver while the engine is running. If the idle changes or stumbles in some way you may need to replace it.

Why is my Honda Accord running at a low idle?

Vacuum leaks add too much air to the mixture causing the engine to run lean. The computer also fights them as it tries to maintain an idle using the IAC but it can’t keep up so you get a ‘hunting’ idle condition meaning that the idle fluctuates from high to low and it never levels out. This condition is often worse after the engine warms up.

#1- Cold Start. If you start the Engine and the Engine started Surging Up / Down ” Right Away ” during ” Idling “. A. Your IACV is either ” STUCK or BROKEN “. You can try to ” Unstuck it ” by cleaning it with Carburetor Cleaner to save $$$, after that put it back and it still not normal / unsuccessful, replacement is a must! #2- Warm / Hot.

How can I tell if my Honda Civic has a vacuum leak?

The easy way to find out if there is a vacuum leak is to spray the hoses with starter fluid or brake cleaner. Make sure this is done on a cool engine. If any of the hoses are cracked or not sealed correctly, they’ll suck in the vapor and the car’s idle will change. This should help you find the general location of a leak.

What does accelerated idle mean on a car?

But if the accelerated idle persists even after the engine is fully warmed up, it probably indicates a genuine problem. The first step is to determine if there are any diagnostic trouble codes stored in the PCM (powertrain control module). If there are, this will give you a good starting point for troubleshooting.

The easy way to find out if there is a vacuum leak is to spray the hoses with starter fluid or brake cleaner. Make sure this is done on a cool engine. If any of the hoses are cracked or not sealed correctly, they’ll suck in the vapor and the car’s idle will change. This should help you find the general location of a leak.

How to troubleshoot an automotive engine high idle?

The troubleshooting procedure for high and low idle conditions are similar, which are included in the following: Step 1 – If the check engine or service engine light soon has illuminated retrieving the diagnostic trouble codes could lead you in the right direction of what the problem is, or is related too.

What’s the problem with my 1992 Honda Civic?

1,060 Asked by nm Apr 09, 2012 at 10:19 PM about the 1992 Honda Civic LX what is wrong with my 1992 civic it cuts off when I give it gas, it idles and starts just fine but when i put it in gear and give it gas it cuts off

What to do if your Honda Civic is shaking?

Let it sit for a few hours until the motor is cool to the touch. Remove the oil dipstick, and check for an appropriate fluid level. Then, check the the coolant reservoir for color, quality, and the appropriate level of the coolant. Top off or replace the engine oil or coolant as needed. Figure 1. Low coolant and grey deposits in the radiator.

What should AC low side high side low pressure be?

On the other hand, there is possibly a huge leak when the pressure is zero. AC Low Side High, High Side Low: Why Does This Happen? The pressure reading from the low side should be between 25 and 30 psi and the high side between 200 and 250 psi.

What kind of car is 1992 Honda Civic Si?

Up for Auction: 1992 Honda Civic SI – 3 Door Hatchback Description: This Honda Civic SI has been a pride and joy to own. Owning one in High School, I acquired this car about 5 years ago and it has been unmolested ever since. The car has sat for the last year and a half as I have been in graduate school and it is time to move on.

What kind of car is 1997 Honda Civic?

Description: Used 1997 Honda Civic DX. This Honda Civic is reliable and stylish. It will ease your mind knowing you are making a great investment. It is a one-owner car in great condition. The title records confirm this.

What kind of mpg does a Honda Civic hatchback get?

The car is easy to maintain, gets about 43 city and 50 hwy. On one trip to Iowa, I filled up the 10 gallon tank in Austin, TX and drove to El Dorado Kansas, where I put 9.6 gallons in. That averaged 57.7 mpg, driving at 65 mph. I have never gotten less than 42 mpg, and that was in summer, AC blasting, in city traffic.

Where can I buy a 1991 Honda Civic?

It is being offered: “INSPECT OR REJECT””AS IS””WHERE IS””NO WARRANTY”Pay by Cash or CheckVehicle located at Haley Toyota 1530 Courtland Rd. Roanoke, Va. Call 540-345-1666. Price excludes tax, tags, title and $599 Processing Fee.

What happens to your car when you idle it?

When the engine idles, there will usually be a misfire that you can feel just from holding onto the steering wheel. Furthermore, the RPM of your engine will be higher than normal when the vehicle is idle. The RPM will usually go back to normal as you accelerate the vehicle, but will increase again after you stop.

What causes the engine rpm to go up when idle?

When the engine idles, there will usually be a misfire that you can feel just from holding onto the steering wheel. Furthermore, the RPM of your engine will be higher than normal when the vehicle is idling. The RPM will usually go back to normal as you accelerate the vehicle, but will increase again after you stop.

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.)

Why is the idle speed of my car so high?

Step 2 – The idle air control motor (valve) is responsible for controlling the engine idle speed, if this part fails or becomes weak the engine idle speed could become erratic, additionally, this condition may or may not trigger the MIL (check engine, service engine soon light.)

How can I keep my car at idle?

Step 3 – Engine vacuum is a sealed system and must hold a specific amount to maintain proper idle conditions, inspect the engine vacuum hoses and intake gaskets. Step 4 – The air intake boot or tube is used to deliver air to the intake system of the engine.

Why does my car rev up when idling?

If your car seems to be revved up to a higher-than-normal RPM while idling, it’s not necessarily a problem. If this problem happens while the engine is cold, it may be part of the engine’s design.

But if the accelerated idle persists even after the engine is fully warmed up, it probably indicates a genuine problem. The first step is to determine if there are any diagnostic trouble codes stored in the PCM (powertrain control module). If there are, this will give you a good starting point for troubleshooting.