Question about Subaru Forester

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Running rough like on 3 cylinders

Car feels like its running on 3 cylinders. no power when accelerating and idling rough

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  • 3 Answers

Could have jumped time, or coils going out. Does it have any CEL on?

Posted on Mar 31, 2014

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6ya6ya
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Posted on Jan 02, 2017

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mcalkins3
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SOURCE: ford f350 6.0L Turbo runs rough

Still sounds like there is a fuel issue. I would check the obvious. Check the Air filter and fuel filter and water seperator. Debris could have gotten into the new injector, which also could have upset the other injector. Get the exact code from the dealer your truck experianced.

Posted on Oct 18, 2008

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SOURCE: 1999 toyota camry

Take it to autozone and have them to pull a code on it.It sounds like O-2 sincer

Posted on Dec 07, 2008

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SOURCE: 1996 FORD CONTOUR 4CYL ROUGH IDLE ROUGH ACCELERATION

no problem. If you are getting that low of voltage on a load then you might want to test the alternator as well to make sure it is running at capacity.

Posted on Feb 23, 2009

soc21610k
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SOURCE: 2001 Chevy Cavalier Misfire

Have you made sure your getting spark on every cylinder from the coil pack?

Posted on Jun 04, 2009

  • 11 Answers

SOURCE: 1995 GMC Safari Loses Power when accelerating hard, rough idle

your egr valve might be faulty bring it in to the auto parts to have it check out what your looking for is the 32 code on the OBD II scanner.

Posted on Sep 04, 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

1 Answer

My 99 camry 4cyl, has a rough idle and sounds like a misfiring when accelerating when in gear. Any answers to what it could be?


You could sure be running on 3 pistons. Check spark plugs by removing one HT lead at a time with engine idling. One that's dead will not alter your idle speed when disconected. Replace bad plug and check the same cylinder again. If OK fine. If not check whether you are getting a spark to that plug and rectify. If you have both power and a good spark but still without power the check engine - valves and pistons.

Sep 25, 2012 | Cars & Trucks

3 Answers

2003 cadillac cts 3.2 liter..rough idle, scan tool shows misfire on bank 1, cylinders 1,3,&5. only at idle, scan tool also showed a cam postion sensor code. cam position sensor changed. no change in...


Did you ever find a solution to this? I am having the same issue on 2,4,6. I have replaced the coils. checked the intake for vacuum leaks. I am lost here let me know if you find anything and I will do the same.

Jan 08, 2011 | 2003 Cadillac CTS

1 Answer

Idles rough when warmed up and also idles high even with idle turned down,motor also acts like its runnin out of fuel if under hard acceleratin


It has a carburetor where the fuel and air mixture is fed to the cylinder, tuning of the engine has to done by adjusting the flow(volume) of both fuel & air. In your case the fuel flow is more and for acceleration a butterfly valve allows momentary more flow of fuel to the cylinder & piston for the engine to compensate/respond to to demand of extra power. However the air flow is constant, thus in your case more fuel but same amount of air floods the cylinder and it feels like like some thing typical choking sound...............sodeep

Oct 27, 2009 | 1987 Mitsubishi Mighty Max

1 Answer

Jetta tdi 2007 running rough on start up at times. blowing excessive amounts of smoke from exhaust at times. poor idle at times feels like running on three and a half cylinders, takes a few seconds too...


You may want to check the ignition system. The smoke could be because of unburnt fuel. You may be running on less then 4 cylinders. Check if all spark plugs are firing. You may also want to use a scanner if there are error codes found in its ECU.

Jul 10, 2009 | 2003 Volkswagen Jetta TDI

1 Answer

Starts fine, smell fuel, rough idle-missing.


have you tried testing your ignition coils, there's 3 of them in a pack, i've had to change a couple when my lumina euro was running badly.
the coils send the spark to the spark plugs, if you have a bad coil, the cylinder won't fire. which would explain the gasie smell. a bad coil will also contribute to loss of acceleration, power and a rough idle.
the coil are rather cheap, about $20cdn each. usually one is dead and the others are good.
to test if your coils are working, what you can do is...
- start your car - unplug one cable and replace it and listen for a change in sound in the engine. if there is a noticable change in sound then that cylinder is working. - if you unplug a cable and nothing happens, and plug it back in and nothing happens, that coil is dead. you will have to replace it (one coil powers two cylinders, each independantly. one cylinder on a coil may work while the other is dead).
*please remember to unplug and replace a cable one at a time. and while doing this don't touch the metal framing of your car, our you'll get a nice zapp.
this is a cheap and easy way to test you coil pack. my friend spent about $1000 and 3 mechanics and they never checked the coils. i did, and didn't cost him a thing.

Jun 05, 2009 | 1990 Chevrolet Lumina

1 Answer

1997 Integra Idles Rough


Does the car accelerate normally under heavy acceleration, or does it feel a bit lethargic?
Fuel economy?
Check engine lights?
Engine shaking at idle or other speeds?
Everything work on it (engine wise)?

Jul 08, 2008 | 1997 Acura Integra Type R

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