Question about 2005 Toyota Corolla

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Idling Problem Suddenly Idle becomes rough and the engine seems will shut off, I have a new battery ,new sparkplug newly changed air filter,and often it runs smoothly. please help thanks a lot

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You have a bad Idle Air Control valve. This is a dealer item.

Posted on Feb 09, 2009

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Rough idle in drive, correct rpm


Car idle is rough Inspection Service & Cost A rough idling engine can be caused by a number of issues, some of them are serious while others tend to be minor, but the symptoms remain pretty much the same. The car will feel rough and bouncy when the engine is running. The car will also idle below its regular speed, display inconsistent RPMs and may produce a shaking, skipping or slipping sound when the vehicle is running.
While a rough idling engine may seem to be a simple inconvenience it often indicates a deeper problem within the engine. The vehicle should be inspected and repaired as soon as possible because small problems have a way of turning into expensive repairs. How this system works: The idle speed of an engine is basically the rotational speed the engine runs on when it is un-coupled from the drivetrain and the throttle pedal is not being depressed. The idle speed is measured in the revolutions per minute of the crankshaft.
When an engine is running at idle speed it generates enough power to smoothly operate equipment such as the water pump, alternator, and power steering but not enough power to move the vehicle itself. A passenger car will usually idle between 600 RPMs and 1000 RPMs. A properly functioning idle should run smoothly without skipping or slipping. Common reasons for this to happen:
  • Dirty Fuel Injectors: The fuel injection system injects fuel into the cylinders, which creates a mix of air, and fuel to ignite and burn. Fuel injectors have tiny nozzles to spray the fuel into the cylinder and they can become clogged over time. clogged or failing fuel injector creates a lack of fuel in the vehicle's engine. This can cause a rough idle, it can also cause symptoms such as slow acceleration or the car not feeling as if it has enough power. If the problem is addressed early, it is possible to clean the injectors, which will restore them to full function. If this condition is not addressed in a timely manner the injectors will need to be replaced. Incorrect Idle Speed: While the average idle speed falls between 600 to 1,000 RPMs, if your vehicle is experiencing a rough idle it could be due to an incorrect idle speed setting. A trained mechanic can easily adjust the idle speed, and it should stay at the proper speed. If an adjusted idle speed becomes inconsistent or changes at random intervals there may be a bigger problem that needs to be explored. Vacuum Leak: If the vacuum system has a leak, it can seriously affect the ability of the vehicle's computer to regulate the air to fuel ratio. This can lead to a rough idle and if the problem is not addressed the car may experience slow acceleration and a lack of power. Vacuum leaks should be inspected and repaired immediately. Incorrectly Installed or Damaged Plugs: Spark plugs are responsible for creating the spark that allows the vehicle to burn fuel. If spark plugs are improperly installed or malfunctioning, the idle speed can be affected. The vehicle's engine may vibrate or there may be slipping or straining sounds coming from the engine. Defective or Clogged Fuel Pump: A rough idle can be related to fuel delivery issues. The fuel pump, which is responsible for pulling fuel from the gas tank to the fuel injectors, can become clogged or defective. If this happens the engine will not get enough fuel, which can cause a rough idle, sputtering, stalling and even slow acceleration. Clogged Fuel Filter: A clogged fuel filter can cause similar problems. The job of the fuel filter is to screen out contaminants in the fuel, over time it will become clogged and need to be replaced. A rough idle is one symptom of a clogged fuel filter. Failing Electrical Components: A problem or failure in the ignition system or various electronic components can cause a rough idle. If this is the case, the problem will usually get worse as RPMs increase. Common culprits include the ignition control module, plug wires, coils, and spark plugs. Defective Airflow Sensor: A defective airflow sensor can be responsible for a rough idle. A mass airflow sensor detects the amount of air coming into the fuel injection system and sends that information to the vehicle's computer. The computer uses that data to deliver the proper amount of fuel to the air in the vehicle. Over time these sensors can malfunction or become dirty. One of the first symptoms of a malfunctioning airflow sensor is a rough idle. The car may also accelerate slowly and even stutter or stall as the problem progresses. Dirty Oxygen Sensor: Oxygen sensors measure how rich or lean the gases are as they exit the combustion chamber. Depending on the results, the amount of fuel entering the engine is adjusted by the vehicle computer. The ultimate goal is to maintain an ideal mixture that produces the lowest emissions. A dirty or failing oxygen sensor will usually trigger the check engine light and can lead to a rough idle, lower fuel efficiency and failed emission test.

Sep 28, 2016 | AC Cars & Trucks

2 Answers

2000 Expedition is idling badly and stalling.


Have you changed your fuel filter? When is the last time you changed your sparkplugs? Have you had any codes on the computer? Heres what I would do. First change your sparkplugs. This is a 4-6 hour job. You have to unbolt the cop(coil on plug assembly). After you change the plugs your truck will run rough. Drive it around the block then back to your house. It will take 3-5 restarts before your truck quits running rough. Reason for this is because your computer is trying to "relearn" the firing order. I have done this several times so i know what i am talking about. You can even look it up. Your 2000 expedition is a dang good truck with a great engine. After your computer relearns the firing order then the rough idle will be gone. Then I would take it out on the freeway and run it hard for 5-10 miles. If you experience a miss or two then that means you need a new cop(s). Get a code reader and it will tell you which cop is bad. Cops are expensive. I bought 6 new ones on ebay for $40. If you buy from autozone or ford dealer then you are looking at about 80-100 bucks a piece. Tell me if this helps. Ford makes a good truck and the expedition is a great truck. Mine is a 2000 expedition also. I have 248,000 miles on it and running strong with no burning oil. Good luck.

Apr 15, 2015 | 2000 Ford Expedition

1 Answer

Why does my 1996 buick roadmaster have rough idling and missing?


I hate to be the bearer of bad tidings, BUT... it\'s obvious that these corrections you\'ve made [lots of $$$$$] have nothing to do with your problem.



Quite OFTEN idle and low speed engine performance problems are CAUSED by LEAKS in the VACUUM lines/system!!!!!



As a vehicle ages, summer heat, as well as engine heat, will cause the rubber or plastic of vacuum lines to deteriorate and either crack or become loose in their connection to nipples and tees in the vacuum system. This allows EXTRA AIR into the engine.



In the early stages of this process, the engine computer will be able to correct for the EXTRA AIR being sucked into the system.



However, as the air leakage increases with time and heat, the computer cannot fully correct, and thus engine performance suffers.



One fix is to replace all vacuum system components, BUT... that will COST HUNDREDS OF DOLLARS!!!!!



The way I have used to FIND vacuum leaks is to use a TINY PLUME of Propane from a small torch.



With the engine idling, gently open the Propane torch valve, "cracked" open just enough to be able to smell the Propane [DO NOT IGNITE/light the Propane, we only want a VERY small amount of gas, but NO FLAME!!!!!].



Then, apply the invisible tiny jet of Propane to EACH connection point in the vacuum system, while the engine is idling.



The engine idle speed [RPM] and sound should remain unchanged IF there is no leak at that connection.



HOWEVER, IF there IS a LEAK, the engine idle RPM and sound will change, and this is indicative of a leak at that point.



Once, when out of Propane, I substituted WD-40, and that worked also!



I suspect that any gas, either a combustible fuel gas, OR even a non-combustible gas would work because either would change the air [Oxygen] to vehicle fuel ratio, thus changing the idle RPM.

Sep 03, 2014 | 1996 Buick Roadmaster

2 Answers

Nissan v6 idle


looks like that either you do have an air mass not correct working,or the throttle body is too dirty and you have to clean it.Also check for any cracked, snapped vacuum hose.

Mar 11, 2014 | Nissan Cars & Trucks

1 Answer

1993 Ford explorer.Began idling rough and surging


The test connector is in a holder at the back bottom of the fuse/relay box on the passenger side fender well. There are 2 parts to it: the main connector and the ground, you will need both connected to the diagnostic tool to get the codes.
Check your IAC (Idle Air Control) valve on the side of the intake. These get carbon fouled and tend to stick causing high rpm for extended times. Also the EGR valve should be checked (under the intake) as it will cause rough idle or stalling near idle.

Mar 13, 2013 | 1993 Ford Explorer Limited

1 Answer

Rough idling


This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control

Sep 27, 2012 | 1997 Jeep Wrangler

1 Answer

My 2000 Ford Ranger suddenly started idling really rough (like it wants to stall) and also shakes really bad at 40 mph. It also shakes the truck while driving, but not as bad as at idle or 40mph. No e


First question is - is the check engine light on ?
If so you need to start with the trouble codes in the computer.
Could be a faulty injector or coil among other things.
You should have a codes for which cylinder is not firing and other possible problems.

Sep 15, 2012 | Ford Ranger Cars & Trucks

2 Answers

My 95 Windstar idles very roughly. It starts just fine but after about 4 to 5 minutes it starts idling roughly. I put a new air filter in but that didn't do anything.


Hi, Try to replace fuel filter. It maybe clogged up and making engine run rough or poor. Also check and replace spark plugs. A bad spark plug will make it run rough too. Good luck.

Jun 15, 2011 | 1995 Ford Windstar

2 Answers

Pick-up hesitates briefly on idle speed


time for sparkplug change, gas filter change

Jul 20, 2009 | 2001 Ford Explorer Sport Trac

1 Answer

Rough idle and generally running terrible!


if idling rough sound like air in system.and your injection pump timing is off.

May 23, 2009 | 1999 Dodge Ram 2500 4WD

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