what could be the problem with my car if it has a rough idle
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What Causes a Car to Run Rough? Reasons for a car running rough can include problems with the engine temperature or oxygen sensors, bad hoses, ignition system or timing problems, clogged air or fuel filters, and faulty spark plugs or fuel injectors. Many problems that manifest through a rough idle can be easily fixed. Full Answer >.
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Car idle is rough Inspection Service A passenger car will usually idle between 600 RPMs and 1000 RPMs. A properly functioning idle should run smoothly without skipping or slipping. Dirty Fuel Injectors: The fuel injection system injects fuel into the cylinders, which creates a mix of air, and fuel to ignite and burn.
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Trouble Starting and Rough Idle on Start Up I had the battery replaced and the spark plugs at ~50,000 miles to no avail. About a month ago, I started my car and it had a really rough idle for about 15 - 30 seconds and the check engine light came on (registered an emission issue), but it ran fine. I had to get a routine oil change and emissions test anyway and they checked the spark plugs as a first measure.
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- - Common Symptoms. An intake manifold gasket can be the source of a vacuum leak and/or engine coolant leak. An intake gasket with a vacuum leak will often have a rough idle and engine misfires. This may turn on the Check Engine Light and set misfire and/or fuel mixture out of range trouble codes.Some intake manifolds are made of plastic. They can become pitted and may need to be replaced along with the intake gaskets.n intake manifold gasket can be the source of a vacuum leak and/or engine coolant leak. An intake gasket with a vacuum leak will often have a rough idle and engine misfires.
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Sounds Like Trouble: A Quick Guide to Diagnosing Common Engine Noises If you hear a light knocking or pounding sound, the noise can usually be traced back to your connecting rods. This sound is often most noticeable when the engine is at an even rpm–not accelerating or decelerating–and is often caused by a worn bearing or crankpin, misaligned connecting rod, or lack of oil.etonation can cause serious damage to an engine. This condition shows up as a knocking or metallic “pinging” sound and is most commonly attributed to improper ignition timing, lean air/fuel ratio, or improper fuel octane level.
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- My Engine is Shaking, and the Car Hesitates. So your engine is idling poorly (shaking, misfiring), and you are not able to accelerate properly. There are a number of potential causes for this problem. These include: - Engine mechanical problem (low compression in one cylinder) - Plugged or defective fuel injector.
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Car idle is rough Inspection Service 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.
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Is revving a car engine bad for it? Confidence votes 76. Revving a Car Engine Yes, revving the engine causes a few things to happen. If it's a cold engine, you can cause friction wear on the cylinder walls, piston rings, and pistons. It can cause excess gas to go into the exhaust and ignite in your catalitic converter.Gas ignition in your exhaust melts the ceramic emission filter, which then makes the car run like having potatoes in the tailpipe.onfidence votes 76. Revving a Car Engine Yes, revving the engine causes a few things to happen. If it's a cold engine, you can cause friction wear on the cylinder walls, piston rings, and pistons. It can cause excess gas to go into the exhaust and ignite in your catalitic converter.
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Car idle is rough Inspection Service 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.
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What Makes a Car Hesitate When Accelerating? The Nature of the Problem. Many things can cause an engine to lose power: bad timing, airflow obstructions going into or out of the engine, carbon buildup on spark plugs, bad gasoline and improper fuel burn in the cylinders are just a few. But these things don't often cause engine hesitation -- at least, not initially.
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Why does a car idle rough? There are a variety of problems that can cause a car's idle to be rough. A rough idle is usually defined by the car idling below its normal speed, loping RPMs, a skipping sound or in a way that causes the car to shake. Idle problems can often be a clue to something more serious going on, so it is best for car owners to get them checked out.
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- High idle speed is the most common cause for engine run-on that I've encountered. Too high idle speed gives the engine both the air needed to keep igniting the fuel and the extra inertia to carry it through a compression stroke or 2 after the ignition is turned off.
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Idle Problems On Fuel Injected Engines The first thing to check for here is a vacuum leak. Sometimes it can be difficult to track down broken hoses, but it takes a large vacuum leak to cause a high idle. Check the rubber hoses that connect directly to the intake manifold and throttle body. These are the most likely to fail.
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- An EGR that doesn’t seal or has vacuum applied when the engine is at idle can cause rough idle. Look for EGR code 34 in this case. Disconnect the EGR vacuum and cap the line and observe if the idle improves. Carbon between EGR the pintle valve and seat can hold the valve off its seat.ow your mechanical and electronic problems are fixed, you can set the base idle speed. Setting the base idle speed: First of all, the idle needs to be adjusted to where the speed is at or below 600 RPM with the IAC disconnected. If you have a wild cam, you may have to raise this figure 100-150 RPM or so.
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Common Causes of a Rough Idling Engine It’s likely you’ve experienced a rough idling vehicle – which just means the car feels rough and bouncy when the engine is running. There are several reasons why this happens – some major and some minor. A common cause – and also an easy one to fix – is a loose or broken vacuum hose.
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- Idle speed is adjusted by means of the idle control valve, which is a solenoid-operated valve that is generally automatically adjusted by a computer. One problem that can occur with this component is a loss of power (from a severed line or a short) but a more common problem is simply dirt and grime.
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- 1 If the car idles rough or cuts off at low RPM or idle, the cause could be a failing O2 sensor. The O2 sensor is out of the loop at full throttle and will not affect the way the car runs.  A rough idle can also be caused by a problem with the air flow box.
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- Lots of discussion in a few threads about a nasty and annoying vibration in idle, but only in gear. Not an erratic idle like a dirty throttle body gives you. That goes up and down when the AC compressor kicks on, and can send the idle down to 300-400 RPM and stall the engine out.
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Is Your Car Idling Too Rough? Possible causes. 1  If you have a carburetor (grandpa), you may have a bad accelerator pump or power circuit. The Fix: Replace accelerator pump or replace carburetor. 2  There may be a vacuum leak. The Fix: Check and replace vacuum lines as required. 3  There may be some type of ignition problem.
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Why Is My Car Shaking? Having your spark plugs checked to make sure that they are all in working order and that they are connected correctly could solve this problem. Another reason your engine might be shaking is because of clogged or dirty filters. If your air or fuel filters are mucked up, the engine isn’t getting what it needs.
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- A bad coil can cause the engine to idle and run rough. It might feel weak with a tendency to stall, and may start to backfire. When the coil fails completely it will cause a non-running condition, or in the case of a coil-over-plug application, a dead miss in that particular cylinder.
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- The others can cause multiple misfires at idle, but the computer can usually to some extent compensate for the loss or malfunction of any one of them. Vehicles that use the above-mentioned sensors completely depend on them at all times, and anything with position in the name can affect your engine at any rpm.
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- Running Problems. 1  Rough Idle If the car starts when cold but, idles rough or does not want to stay running, this can indicate a problem with the engine temperature sensor. When the engine is started cold, the engine temperature sensor sends a signal to the DME control unit to provide a richer mixture.
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- An engines idle speed is a programmed function. We cannot directly adjust the engine idle speed on a modern vehicle. The power control module or PCM provides all adjustments to the idle speed. Though no external engine idle speed adjustments are possible, many things can and do cause problems.
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Why does my car idle at a really low RPM while stopped, and start shaking? This could mean a vacuum leak from a hose or the intake manifold itself. Or, commonly, it could be that your Idle Air Control Valve is clogged or not working well. The engine monitors via sensors how much air is coming in vs engine speed and uses that to control fuel injection and ignition timing.