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Car Idles Up And Down. Car idles up and down when warmed up. I can find diagrams and they list the fuses for the 7 pin, but not the four. What you are describing is a category of inconsistent idle. You will have to check if the iac is working or not.

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Discussion starter · #1 · may 27, 2010. Car idles up and down when a/c is turned on. Also, the temperature guage on dash. Car idles up and down when warmed up. Jump to latest follow status not open for further replies. The voltmeter should read around.45 volts.

No lights or messages are coming up on the dash.

Where is the fuse for the 4 pin trailer plug on a 2008 ford expedition. Where is the fuse for the 4 pin trailer plug on a 2008 ford expedition. Jump to latest follow status not open for further replies. That�s called engine surge, and sue is going to show you wh. If this sensor is not working correctly, your car might not shift gears properly, which can make be the reason why your car revs up and down while driving. So i tried the same thing again, but two different used iacvs changed nothing.

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Go down to the short term fuel trims and see what % they are at. Thats because the iac is what tells the car if it needs a cold or hot idle. If this sensor is not working correctly, your car might not shift gears properly, which can make be the reason why your car revs up and down while driving. If its not at this voltage. A sticking or dirty throttle body ;

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Press the throttle and hold it around 2000 rpm’s. One reason that your car’s engine could be idling up and down on its own is a dirty mass air flow sensor. What you are describing is a category of inconsistent idle. Fortunately, most lawnmowers have two screws that allow you to adjust the carburetor yourself. Car idles up and down when warmed up.

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Press the throttle and hold it around 2000 rpm’s. Click to see full answer. The tps is the sensor on the backside of the throttle body closest to the firewall. I start it when cold and it idles fine til it gets warmed up and then, when it�s warm it idles up and down from a slightly fast idle back to a normal idle. No missfire can drives well just when its idle it goes up to 1500rpm then back down but performance feels normal just put full tank fuel.

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While the car is running, you need to get a voltmeter and test the red wire on the plug that runs to the tps. This might be caused by a loose harness connection or by a damaged or contaminated sensing wire. While the car is running, you need to get a voltmeter and test the red wire on the plug that runs to the tps. But it doesn�t stop doing this. Its either gone bad or has somehow gotten unset.

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Most of the time, you’ll notice your car speeding up faster, which is directly caused by. No missfire can drives well just when its idle it goes up to 1500rpm then back down but performance feels normal just put full tank fuel. A vacuum leak, sensor that has failed, or an egr system malfunction could potentially be the cause of the erratic engine you’re experiencing. Car idles up and down when warmed up. You will have to check if the iac is working or not.

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This cycle repeats about once every two seconds. The tps is the sensor on the backside of the throttle body closest to the firewall. Discussion starter · #1 · may 27, 2010. Any car that has an iac senser (which is lot more then just certain mazdas) will cause the idle to fluctuate if the coolant is low. It opens and closes depending on the volume of applied throttle that enables the engine to take in air.

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Asked by amp1stunner in florence, sc on march 25, 2011. Car idle up and down. A sticking or dirty throttle body ; If this sensor is not working correctly, your car might not shift gears properly, which can make be the reason why your car revs up and down while driving. What you are describing is a category of inconsistent idle.

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The engine surge which makes the rpm go up and down might be caused by a defective or stuck idle air control valve or the iac. We use cookies to give you the best possible experience on our website. If its not at this voltage. For more info visit us at: Go down to the short term fuel trims and see what % they are at.

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No missfire can drives well just when its idle it goes up to 1500rpm then back down but performance feels normal just put full tank fuel. Then slowly adjust the screws tighter or looser in turn until the. Also if i put it in gear, and put a load on the engine. Among the potential underlying causes are vacuum leaks, egr system malfunctions, malfunctioning oxygen sensors, dirty fuel injectors, fuel pump malfunction, faulty spark plugs, a faulty. The underlying fault may exist at higher engine speed but the effect is masked at those higher speeds.

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Fortunately, most lawnmowers have two screws that allow you to adjust the carburetor yourself. Need to know which box and which fuse slot. Also if i put it in gear, and put a load on the engine. If this sensor is not working correctly, your car might not shift gears properly, which can make be the reason why your car revs up and down while driving. This cycle repeats about once every two seconds.

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So i tried the same thing again, but two different used iacvs changed nothing. Car idles up and down when a/c is turned on. Keeping this in view, what causes a small engine to rev up and down? A common reason behind your car’s weird behavior may often be its sticking or dirty throttle body valve. Jump to latest follow status not open for further replies.

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4 reasons why my car revs up and down while driving? More than likely its your tps sensor. Fortunately, most lawnmowers have two screws that allow you to adjust the carburetor yourself. A carburetor that�s incorrectly adjusted is a common cause of poor engine idling that results in hunting and surging. It almost dies but comes back to normal idle.

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Most of the time, you’ll notice your car speeding up faster, which is directly caused by. If its not at this voltage. On a number of ocassions now i have stopped at lights / junctions etc and the car begins to rev up and down (by around 2 to 3 hundred revs). This might be caused by a loose harness connection or by a damaged or contaminated sensing wire. If this sensor is not working correctly, your car might not shift gears properly, which can make be the reason why your car revs up and down while driving.

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So i tried the same thing again, but two different used iacvs changed nothing. The tps is the sensor on the backside of the throttle body closest to the firewall. More than likely its your tps sensor. It should be the center wire. Hi i changed the spark plug and replaced the boot for the spark plug and my car started idling up and down.

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Car idles up and down when warmed up. While the car is running, you need to get a voltmeter and test the red wire on the plug that runs to the tps. The mass air flow sensor attached to your car’s engine is designed to sense the amount of air coming into the air intake and through the throttle valve of your engine. A vacuum leak, sensor that has failed, or an egr system malfunction could potentially be the cause of the erratic engine you’re experiencing. The voltmeter should read around.45 volts.

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That�s called engine surge, and sue is going to show you wh. The idle is controlled by the idle air control valve and if it cannot keep the engine idling it will keep trying to rev the engine up to compensate. Among the potential underlying causes are vacuum leaks, egr system malfunctions, malfunctioning oxygen sensors, dirty fuel injectors, fuel pump malfunction, faulty spark plugs, a faulty. My foot is off the gas, and it happens regardless of whether the clutch is in and i�m in gear or the clutch is out and i�m in neutral. But it doesn�t stop doing this.

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4 reasons why my car revs up and down while driving? Why does my car rev up and down while idling? Some of the things you can do to identify the problem in the car. Its either gone bad or has somehow gotten unset. A vacuum leak, sensor that has failed, or an egr system malfunction could potentially be the cause of the erratic engine you’re experiencing.

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Some of the things you can do to identify the problem in the car. Also, the temperature guage on dash. Click to see full answer. What you are describing is a category of inconsistent idle. Where is the fuse for the 4 pin trailer plug on a 2008 ford expedition.

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