Rough idle sucking noise

My car idles very rough and has now power. It also makes a sucking noise from the throttle body. I think I fixed all of the leaks in the vacuum system. I have trouble starting my car, but I get it going by flooring the gas pedal when I start it. I cleaned the vacuum lines, replaced the map sensor which had a bad code and replaced the Exhaust Gas Recirculation. Doing all of this hasn’t done any good for my car. Do you have any idea what else it could be?
Experienced mechanics share their insights in answering this question :
Hi there, thanks for writing in. If the loud sucking noise isn’t coming from the large throttle body bore, you may still have a vacuum leak present. Any leak after the throttle opening will cause performance issues. The leak can even be at the throttle body seal. If you’d like us to check on this issue for you, a certified mechanic can come to your home or office and smoke test your vehicle to uncover and minuscule leaks, and further inspect the noise issue. If the issues lies with the throttle body itself, we can also replace the throttle body for you.

How to Identify and Fix Common car Problems ?

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What Happens When a Throttle Body Goes Bad. If your car runs rough when idling, the cause just might be a dirty throttle body. The throttle body controls the amount of air the engine takes in, and when it gets dirty, the engine can`t idle smoothly.
Common signs include dirt, grime, and carbon deposits on the inside of the housing, electrical problems, vacuum leaks, and a very poor or high idle.
The major symptom of a vacuum leak is very poor idle quality, stalling, Spitting back through the Intake, and a very lean condition at part throttle. This is the most common problem when doing carb conversions where either adapter plates are used or new intake manifolds are fitted.
How to fix it? Cleaning or replacing the fuel filter and adding a fuel injector cleaning treatment to the fuel tank should take care of clogged fuel injectors. If the rough idle persists, it`s time to take your car to an auto repair shop.
Oxygen (O2) sensor

An oxygen sensor monitors and analyzes the amount of oxygen in a vehicle`s exhaust system after combustion. A dirty, damaged or malfunctioning O2 sensor (or sensors) affects the air/fuel mixture, causing the engine to idle rough.

Common signs include lacking power when accelerating, rough or slow idle, stalling, inability to shift up, and the Check Engine Light coming on.
Usually, when the leak isn`t too bad, you will hear hissing noises coming from the engine. This may also sound like whining sounds or whimpering sounds. For more severe vacuum leaks, the noise is sucking or suction, much like a vacuum cleaner.
Sporadic Idling

One of the primary signs of a vacuum leak is sporadic idling. You might notice that your engine is idling fast while you are at a stop, particularly if your tachometer is bouncing up and down or resting at a setting that is too high. The sporadic idling is being caused by too much air in the engine.

When the throttle body gets dirty, it has a direct effect on how smoothly the engine operates. Signs indicating a problem include rough idling, jumpy or sluggish acceleration, poor fuel economy, and stalling. With the use of a throttle body cleaning product, the dirt and debris buildup are easily removed.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Rough idle sucking noise – 1989 Plymouth Acclaim
ANSWER : Hi there, thanks for writing in. If the loud sucking noise isn’t coming from the large throttle body bore, you may still have a vacuum leak present. Any leak after the throttle opening will cause performance issues. The leak can even be at the throttle body seal. If you’d like us to check on this issue for you, a certified mechanic can come to your home or office and smoke test your vehicle to uncover and minuscule leaks, and further inspect the noise issue. If the issues lies with the throttle body itself, we can also replace the throttle body for you.

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The car idles rough and is shooting out codes p0017, p0016.
ANSWER : Hello. This is a common problem with the variable valve timing solenoid on this engine. I have changed quite a few of these due to failure. I always start by checking the codes and testing the solenoids and the connectors as some of the time the connectors fail and have poor connections. There have been a few times that I have seen these codes due to low oil or the wrong oil and from the camshaft actuators failing, but most of the time it is due to the solenoids. If you are planning on having this fixed, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose and repair the rough idling issue for you.

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Clicking noise in idle (link of Video of noise included)
ANSWER : Hi there. Although it is hard to pinpoint the exact source of this noise via a video, it sounds a lot like an exhaust leak. When the exhaust manifold of exhaust tubes age, they are exposed to elements, creating weakness in the metal and eventually will crack or break. It is also possible that this sound is caused by cylinder head hardware that is loose (such as lifters or rocker arms) or not getting enough lubrication. Again, without being there it is impossible to know for certain, but you might want to have a professional mechanic complete a car is making a noise inspection to determine what is causing this issue.

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Rough idle, fluctuating rpms, stalling
ANSWER : Hello, thank you for writing in. The vehicle is struggling to keep up with all of the different accessories when the engine is idling. This is typically due to an issue with the air intake, fuel intake, or the sensors that monitor and control them. Start by having the vehicle scanned for codes at your local automotive parts store, or by a different technician. If no codes are present, attempt to clean the throttle body, idle air control valve, and the throttle position sensor. If there are codes present, then you can use them to point you to the issue at hand, and take corrective action from there. For more help with diagnostics or resolving the issue, contact our service department to schedule an appointment.

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Tapping Noise when idling?
ANSWER : Hi there. Check the engine mounts and see if they are loose, worn, or broken. Engine mounts that are not secure to the vehicle properly will make the vehicle vibrate when at a stop and in drive with the brakes on. The tapping noise could be the air conditioning fan cage tapping as it could be loose or simply change left over in your console. I recommend seeking out a professional, such as one from Your Mechanic, to help you diagnose your vibration while at stopped in gear with the brake on.

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Can the idle air control cause my engine to idle roughly?
ANSWER : Hi, thanks for writing in. Sure, the idle control valve can definitely cause the rough idle. Typically this will be caused by excess carbon buildup inside the throttle body or fuel injector nozzles themselves. Your 2006 Kia has multiple sensors that monitor and control the fuel system. If one of these sensors is dirty, damaged or sending misinformation to the Engine Control Module, it can cause the idle to run very rough. Some other issues that may be causing this symptom may include dirty EGR valve, air/fuel sensor or problems with the throttle body itself.

If you would like help, consider having an expert automotive technician from YourMechanic come to your home or office to inspect and diagnose this issue for you, and make or suggest any repairs as needed.

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My car runs rough at idle, stalls at idle, surges, and idles at 40 miles an hour
ANSWER : A number of components or faults can cause your issues. A vacuum leak can cause your issues. Depending on the vehicle, components such as the mass airflow sensor, throttle position sensor, coolant temperature sensor, and a number of others can be the cause. Since randomly replacing parts can get expensive as most electronic components are not returnable once installed, having a certified technician, such as one from YourMechanic, diagnose the stalling/surging is the best place to start.

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My car is idling rough and flooding out when first starting. What could be causing this?
ANSWER : This may be related to a dirty or failing idle air control valve. The idle air control valve reads the air intake as it is mixed with fuel prior to being injected into the engine at low speeds and at idle. This valve is controlled by the vehicle’s computer which will adjust idle speed based upon other measurements, such as engine temperature, intake air temperature, and electrical system load or voltage.

When you accelerate, the engine RPM increases, and, as you let off the gas, the RPM slowly returns to the normal idling speed. This is all controlled by the idle air control valve. When the engine RPM drops below the normal range of 750-800 RPM, this may indicate a dirty or faulty idle air control valve.

I would recommend having an expert, such as one from YourMechanic, come to your location to determine why the car is running rough and replace your idle air control valve if needed.

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