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Why does my rpm go up and down on cold start

One common reason for RPM fluctuations is worn-out spark plugs. When the plugs are in bad condition, they can't produce a strong spark, making it difficult for the engine to run smoothly. As a result, the RPMs may go up and down as the car tries to compensate. If your spark plugs are worn out, they should be replaced as soon as possible. 2.
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2022. 7. 16. · Search: Toyota Corolla Engine Noise When Cold. my - 2009 Honda CR-V 2 Shown is a 2010 Corolla Engine difficult to start when cold Manual corolla engine 4A-FE 3S-GTE 5S-FE - Free ebook download as PDF File ( The weather here is not very hot or very cold The weather here is not very hot or very cold. 2007 Toyota FJ Cruiser. ... 1,106 Posts #11 · Nov 26, 2007.

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2018. 12. 7. · At cold start, RPM shoots up to 1400-1500 and drop to 1000-1100 immediately. Then within five seconds, RPM starts to climb gradually for about one minute until getting over 1500. And going down slowly for ~4 minutes and.
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Answer (1 of 6): Well, hopefully you took your foot off the gas pedal. This decreased the flow of fuel to the engine, which then slowed back down to idle speed. Being at higher RPMs while being stopped would waste fuel, be unnecessarily noisy, and contribute to unnecessary wear.
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Honda Civic Engine Idle Surging Up / Down - Poor Idling P0505 IACV Hot - Cold or Warm StartHonda Civic Engine 1.5L / 1.6L / 1.7L / 2.0L / 2.0L - S Type#1- Co.
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After running for just a few minutes it will usually start to surge up and pulse up and down in a consistent rhythm, usually between 1,000 and 2,000 to 2,500 or so, but it has already surged up to 3,000rpm a few times. It feels just like I'm pressing on the gas and letting it back off every 2 seconds.
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2022. 1. 13. · The perfect shift lies slightly before the indicator reaches the red zone. When you stomp on the accelerator, the engine starts to rotate faster, this increases the RPMs. When the driver shifts to a higher gear, the engine rotates a larger cogwheel. This increases the speed of the car and reduces the number of RPMs.
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2018. 12. 7. · At cold start, RPM shoots up to 1400-1500 and drop to 1000-1100 immediately. Then within five seconds, RPM starts to climb gradually for about one minute until getting over 1500. And going down slowly for ~4 minutes and stabilized at ~700. Put gear to D right after cold start, and let the car creep without pedaling gas.
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If it does it when the engine is warm then make sure you clean your idle air control valve (IACV), which is located on the underside of the throttle body. These get clogged up with carbon over time and cause high idle problems. If the high idle disappears once the engine is warm then you have nothing to worry about.
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Symptom 499000 Basic Engine. Content. Issue: Fuel injectors clogged leading to potential problems such as poor running, poor fuel economy, excessive exhaust emissions, hard starting, rough idle, misfires and engine detonation. Cause: Poor fuel quality or fuel contaminants restricting the fuel injector flow rate.
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High RPMs in the cold is a result of combustion taking place in the engine. Your car is able to start because gasoline and air are coming together to form a spark. This spark is only possible if fuel and air are combined with the right timing and proper ratio. Gasoline vaporizes much more easily in warmer temperatures to get that spark. One common reason for RPM fluctuations is worn-out spark plugs. When the plugs are in bad condition, they can't produce a strong spark, making it difficult for the engine to run smoothly. As a result, the RPMs may go up and down as the car tries to compensate. If your spark plugs are worn out, they should be replaced as soon as possible. 2.

Learn how a quick tune-up can help improve engine performance! You may notice that there is fluctuation in RPM's whether at idle, or when driving your car. Learn how a quick tune-up can help improve engine performance. ... distributor cap and more are all small factors that can contribute to making a big difference down the line. Vacuum Leak. 2022. 8. 7. · 4. Vacuum Leak. An engine vacuum leak can also make your car’s RPM fluctuate. This leak usually occurs in the engine bay. Apart from your RPM fluctuating rapidly, other signs of a vacuum leak are a hissing sound, loss of. The rpm needle is basically bouncing up and down. If I have it in drive and I'm pressing the break pedal, the car is actually trying to move forward, which caught me off guard for a brief moment. This only happens in the severe cold (like today) and only during the cold start. Once the car is warm the problem is gone. Symptom 499000 Basic Engine. Content. Issue: Fuel injectors clogged leading to potential problems such as poor running, poor fuel economy, excessive exhaust emissions, hard starting, rough idle, misfires and engine detonation. Cause: Poor fuel quality or fuel contaminants restricting the fuel injector flow rate.

379 Posts. #12 · Jun 3, 2005. The temperature of the engine coolant most likely controls the idle especially the high idle at startup. Over at Yotatech, there is this mod known as the ECT mod. The ECT mod is designed to raise the idle by altering the signal from the engine coolant temperature (ECT) sensor to the ECU. High RPMs in the cold is a result of combustion taking place in the engine. Your car is able to start because gasoline and air are coming together to form a spark. This spark is only possible if fuel and air are combined with the right timing and proper ratio. Gasoline vaporizes much more easily in warmer temperatures to get that spark. One common reason for RPM fluctuations is worn-out spark plugs. When the plugs are in bad condition, they can't produce a strong spark, making it difficult for the engine to run smoothly. As a result, the RPMs may go up and down as the car tries to compensate. If your spark plugs are worn out, they should be replaced as soon as possible. 2. Truck stalls on cold startup after putting in reverse or drive. Ford F-150 2009 Engine 100000 miles. Revs up Stalls. 2009 ford f150 lariat 4x4 5.4 3v. First start after sitting overnight. Rpms go up the down right away to about 300 then back up to.

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I am presuming this is a gasoline engine. If so, the symptoms sound very much like the throttle internals are dirty. If gunge builds up on the butterfly valve, it can restrict the air required for a smooth idle when the butterfly is closed, so the engine ECU needs to open the Idle Air Valve more that it thinks it should have to and you get into a cycle of surging revs. . Causes of a Jumping RPM Worn Spark Plugs or Spark Plug Wires Spark plugs that are worn out struggle to ignite the fuel within the piston at the correct time. This can result in poor acceleration. Your vehicle may experience misfires and jerking while accelerating. 27. 11. 0. Hi guys, I have a question about my idle or rpms staying high after rideing around and maintaining the same speed for a while. As an example, it happens quite a bit when I get off the fwy having rode for about 15-20 minutes at high fwy speeds. I get off the off ramp, down shifting like I normally do to a stop and the idle in 1st gear. 379 Posts. #12 · Jun 3, 2005. The temperature of the engine coolant most likely controls the idle especially the high idle at startup. Over at Yotatech, there is this mod known as the ECT mod. The ECT mod is designed to raise the idle by altering the signal from the engine coolant temperature (ECT) sensor to the ECU.

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Mine does not show the engine revs on the dash trick, it doesent even show speed, if i disconnect icv on tick over engine speed does drop, but yet again, if i disconnect alt completly, that is red power cable and 3 pin smart charge plug, i can turn on everything elctrical, and there is no change in engine speed, everything works perfect, if i start enging and run it off just battery.

  • 2022. 7. 14. · Causes of RPM Going Up and Down At Idle. Here are some possible causes of your vehicle RPM going up and down at idle: 1. Air Leak In The Intake Channel. Confirm if the pressure on the turbo is rising or the vehicle’s system is not receiving the required boost pressure. The flow of air might have been compromised due to a leak. started bucking, rpms rapidly going up and down. If I try to push on gas it eventually would backfire and smelled rich. Replaced wires, plugs, distributor cap/rotor, tps, ignition module, map, IAC, engine coolant temp sensor, rebuilt fuel pressure regulator and new alternator. A month before all this we put in a new battery, cat converter, o2. DG Set RPM goes up & Down or we can say DG haunt's till the engine Remain Cold. Fuel Supply controlled by the 12 V Solenoid. Once the Temp Reaches at 70C, It Disappears. I checked the Fuel Line, Changes the Filters still it Persist. Can anyone help on the possible Causes for this and how to remove them.

  • Everything was going great with the new ride until a random anomaly started to occur (my wife is the primary driver, so the discovery was new to me, but may have been present for some time now). The anomaly was a fluctuating RPM gauge upon idle, the truck would start normally but would pulse downwards for a instant and then resume to normal. That's why it's so important to have a great answer for why you're applying for this position and why you're interested in this position. AC bump AC adds additional load; to meet load engine rpm will go up Battery battery voltage is low or electrical load is high, rpm is increased to have alternator produce more power Check engine light is on depending on what the code is. 2022. 3. 2. · When you brake, your car is slowing down to a stop. Your car’s automatic transmission is trying to adjust for the change in speed and this adjustment can cause your RPM to go up. Now if you notice that your RPM is unusually high, you may want to check in with your mechanic to find out why your engine is working so hard. Start it, put it in gear, and go. Do everything possible to keep RPMs low while driving, under 2-3,000 for sure, but get some load on the engine. Also, try to minimize cold shifting as well. You shouldn't redline it, or go anywhere close, until oil temps are north of 150. sccxvely said: Yes, exactly what you said.

2001 Jetta GLS TDI. May 2, 2014. #1. Bouncing RPM at idle. after cold start, every time- VIDEO ADDED. Every time I start my car, if it has had time to cool down, (in the am or after work etc..) the RPM's will bounce or surge up and down. It smooths out after a few minutes of idling, or I usually just hold it at 1500-2000 RPM for a few seconds. started bucking, rpms rapidly going up and down. If I try to push on gas it eventually would backfire and smelled rich. Replaced wires, plugs, distributor cap/rotor, tps, ignition module, map, IAC, engine coolant temp sensor, rebuilt fuel pressure regulator and new alternator. A month before all this we put in a new battery, cat converter, o2.

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2022. 8. 8. · If your car’s RPMs fluctuate while accelerating, then you may be dealing with an engine vacuum leak in the engine. A vacuum leak is when there is an interruption in the air flow in the intake manifold or exhaust system of your vehicle. Other signs of a vacuum leak include lower fuel efficiency, a hissing sound, check engine light turning on.

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  • That's why it's so important to have a great answer for why you're applying for this position and why you're interested in this position. AC bump AC adds additional load; to meet load engine rpm will go up Battery battery voltage is low or electrical load is high, rpm is increased to have alternator produce more power Check engine light is on depending on what the code is.

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Going to have to call this solved. While my PC runs a little louder now, I don't have the annoying rev'ing up and down. I adjusted the lower two balls as illustrated in my previous screenshot a couple times, I think this is as good as it's going to get. I might buy a new CPU fan in the future and try swapping it in just to give that a go.

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If it revvs on its own during a cold start idle, you should let the car sit for 1-2 minutes. If the revving stops, you can drive the vehicle. If the revving continues, turn off the vehicle and diagnose the issue or have a mechanic inspect it. If it revvs on its own while in drive, stop the car immediately and turn the vehicle off. 2022. 8. 7. · 4. Vacuum Leak. An engine vacuum leak can also make your car’s RPM fluctuate. This leak usually occurs in the engine bay. Apart from your RPM fluctuating rapidly, other signs of a vacuum leak are a hissing sound, loss of. What causes Kohler engine surge? surging on a governed engine is always due to an fuel;air ratio that is too low. The fuel supply to the main jet is not enough. You test for the first by starting the engine and saturating the area between the carb & the engine with WD 40 or similar from a trigger pack, not a spray can.

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I'd also say its probably the FITV. When I put my H22a in it had an idle surge and it was the FITV. My Accord has been having an idle surge in the winter like you explained every now and then and only does it when its cold. And it usually only does it after I drive it, then wait an hour or two and give the engine time to cool off, then when I start it back up it has the surge. The 2003 Chevrolet Silverado has 7 problems reported for rough idle, runs roughly.Average repair cost is $130 at 88,600 miles. Jul 19, 2012 · maproy99. I keep having a rough idling issue on my Silverado (5.3 liter v8 flex fuel) after high RPM for a short time. Happened 5 times within the last 30 days, 2 of which where while I was towing the boat the the others were when I was running late and.

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1 day ago · Search: Rpms Go Up And Down While Driving. Yea once I start'er up the rpm's go to somewhere between 2-3000 just sitting there in park and/or - if/when I shift into neutral By cleaning and resetting the plate there will be some flow and the idle motor doesn’t have to work as hard By the way, in my case the tachometer normalizes after several minutes of driving,. 2022. 3. 2. · When you brake, your car is slowing down to a stop. Your car’s automatic transmission is trying to adjust for the change in speed and this adjustment can cause your RPM to go up. Now if you notice that your RPM is unusually high, you may want to check in with your mechanic to find out why your engine is working so hard. What causes Kohler engine surge? surging on a governed engine is always due to an fuel;air ratio that is too low. The fuel supply to the main jet is not enough. You test for the first by starting the engine and saturating the area between the carb & the engine with WD 40 or similar from a trigger pack, not a spray can. 2019. 12. 25. · 0. I buy my first real motorcycle!It is awesome but on idle rpm goes up and down.It’s scares me because it’s injector motor not chinese.Can i drive with it or thats not nice for engine?Does someone now what is possible problem?Rpm changes about 500rpm.And it’s 125cc engine! engine idle. Share. Improve this question. edited Dec 25, 2019 at.

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RPM go up and down. My car does not have any leaks and full on coolant. After driving for about 45min to a hour while on the highway most of the time, the temperature gauge start to show the temperature go up but only 1 bar nothing to bad or to hot but when i put it in neutral and rev my engine just a little it will go down.

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  • Step 2 - Clean the throttle body. A gummy intake valve will stick, and restrict the amount of air getting into the engine. It will also cause your throttle response to be uneven and sticky. To diagnose the throttle body: Let the engine cool. Remove the hose between the air box and the front of the throttle body.

  • That's why it's so important to have a great answer for why you're applying for this position and why you're interested in this position. AC bump AC adds additional load; to meet load engine rpm will go up Battery battery voltage is low or electrical load is high, rpm is increased to have alternator produce more power Check engine light is on depending on what the code is.

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  • 2019. 12. 25. · 0. I buy my first real motorcycle!It is awesome but on idle rpm goes up and down.It’s scares me because it’s injector motor not chinese.Can i drive with it or thats not nice for engine?Does someone now what is possible problem?Rpm changes about 500rpm.And it’s 125cc engine! engine idle. Share. Improve this question. edited Dec 25, 2019 at.

  • DG Set RPM goes up & Down or we can say DG haunt's till the engine Remain Cold. Fuel Supply controlled by the 12 V Solenoid. Once the Temp Reaches at 70C, It Disappears. I checked the Fuel Line, Changes the Filters still it Persist. Can anyone help on the possible Causes for this and how to remove them.

High RPMs in the cold is a result of combustion taking place in the engine. Your car is able to start because gasoline and air are coming together to form a spark. This spark is only possible if fuel and air are combined with the right timing and proper ratio. Gasoline vaporizes much more easily in warmer temperatures to get that spark. If your car revs high when you start it, which is usually above 1000 RPMs, you could have a dirty throttle body or a dirty air idle control valve. Both the throttle body and the air idle control valve control the amount of air that gets into the engine. The throttle body makes sure more air gets into the engine when you press the gas pedal.

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Oct 29, 2011 · 1997 Ford F-150. i have a 1997 ford f-150 v6 4.2 and the problem i am having is when it idles it jumps between 500 and 700 rpm and acts like it wants to shut off and when its in gear at a red light it does the same and then i push my gas to go and it almost stalls out on me but when i get going it runs good. why would it be .... costco locations in north carolina. .

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2018. 12. 7. · At cold start, RPM shoots up to 1400-1500 and drop to 1000-1100 immediately. Then within five seconds, RPM starts to climb gradually for about one minute until getting over 1500. And going down slowly for ~4 minutes and stabilized at ~700. Put gear to D right after cold start, and let the car creep without pedaling gas. 2022. 1. 13. · The perfect shift lies slightly before the indicator reaches the red zone. When you stomp on the accelerator, the engine starts to rotate faster, this increases the RPMs. When the driver shifts to a higher gear, the engine rotates a larger cogwheel. This increases the speed of the car and reduces the number of RPMs. 2022. 7. 16. · 1. Worn Out Spark Plugs. One common reason for RPM fluctuations is worn-out spark plugs. When the plugs are in bad condition, they can’t produce a strong spark, making it difficult for the engine to run smoothly. As a result, the RPMs may go up and down as the car tries to compensate. Everything was going great with the new ride until a random anomaly started to occur (my wife is the primary driver, so the discovery was new to me, but may have been present for some time now). The anomaly was a fluctuating RPM gauge upon idle, the truck would start normally but would pulse downwards for a instant and then resume to normal.

2011. 3. 27. · The starter doesn't normally spin the engine all the way up to idle speed. It turns it to a few hundred rpm, and a bunch of fuel is dumped into the engine. This causes the initial surge in rpm to get the engine running. The engine then needs to run at a higher rpm for a short time to increase temperature up to operating temperature, after which the idle speed drops.

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However, there are specific throttle position sensor signs to look for to help ensure you find the culprit. What Does a Throttle Position Sensor Do? Top 6 Bad Throttle Position Sensor Symptoms. 1) Car Jerks. 2) Idle Surging. 3) Check Engine Light. 4) Engine Stalling. 5) Acceleration Issues. Honda Civic Engine Idle Surging Up / Down - Poor Idling P0505 IACV Hot - Cold or Warm StartHonda Civic Engine 1.5L / 1.6L / 1.7L / 2.0L / 2.0L - S Type#1- Co. An engine vacuum leak can also make your car's RPM fluctuate. This leak usually occurs in the engine bay. Apart from your RPM fluctuating rapidly, other signs of a vacuum leak are a hissing sound, loss of power, low fuel efficiency, check engine light comes on, car stalling, and rough idle. What should I do if my car rpm goes down to zero?. What causes Kohler engine surge? surging on a governed engine is always due to an fuel;air ratio that is too low. The fuel supply to the main jet is not enough. You test for the first by starting the engine and saturating the area between the carb & the engine with WD 40 or similar from a trigger pack, not a spray can. High RPMs in the cold is a result of combustion taking place in the engine. Your car is able to start because gasoline and air are coming together to form a spark. This spark is only possible if fuel and air are combined with the right timing and proper ratio. Gasoline vaporizes much more easily in warmer temperatures to get that spark. Kevin Gainer Automotive Mechanic 35 years of experience Common causes of high RPM excursion at start-up are typically: large vacuum leak, throttle plate stuck open, cruise control stepper motor stuck in one position; faulty throttle position sensor, and/or faulty idle air control motor or solenoid.

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If it revvs on its own during a cold start idle, you should let the car sit for 1-2 minutes. If the revving stops, you can drive the vehicle. If the revving continues, turn off the vehicle and diagnose the issue or have a mechanic inspect it. If it revvs on its own while in drive, stop the car immediately and turn the vehicle off. Ongoing issue. Sometimes when i start my car in the morning, or when leaving the office in the evening, and put it in reverse and give it gas the engine revs, rpms go up, but the car won't go. I will roll down my driveway (it's on an incline), put the car in drive and still have the issue. 2022. 6. 10. · The RPM meter shows the engine’s revolution per minute, and crossing the red line can lead to serious damage to your car engine. Your RPM can go up and down due to problems with your spark plugs, transmission problems, or a vacuum leak. Additionally, a dysfunctional idle air control valve or a faulty crankshaft position sensor can also lead. Due to dust and contamination the sensor starts to send erratic values to the ECU. The problem migh be with the ignition coils / sparks, there can be a bit of loose connection causing uneven sparks at low rpms due to low voltage in the whole system. Although it is considered as a normal phenomenon for a cold engine to start with high RPM, it will drop immediately after warming up, especially when the engine is trying to heat itself up. This is an automatic choke, stepping up the RPM to keep your engine from stalling. It restricts the airflow, which increases the fuel/air mixture.

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2020. 6. 18. · Why does my RPM go up when I turn it on? When your car is started, the pistons inside the engine begin moving up and down forcing the crankshaft to turn. Once the crankshaft has turned 360 degrees, it is referred to as a revolution. If your engine is idling higher, due to an internal issue, your vehicle’s RPM may run higher. If your plug is damaged it might cause your RPMs to run high. Plugs are responsible for the creation of the spark that ignites the fuel in the engine. Also, if the plug is dirty, it causes rough idling which may prevent the car from starting. There might be a leaking vacuum hose in the car, hoses deliver air and fuel to the combustion chamber. What causes Kohler engine surge? surging on a governed engine is always due to an fuel;air ratio that is too low. The fuel supply to the main jet is not enough. You test for the first by starting the engine and saturating the area between the carb & the engine with WD 40 or similar from a trigger pack, not a spray can. If your car revs high when you start it, which is usually above 1000 RPMs, you could have a dirty throttle body or a dirty air idle control valve. Both the throttle body and the air idle control valve control the amount of air that gets into the engine. The throttle body makes sure more air gets into the engine when you press the gas pedal.

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The RPM goes up and down by its self without my pushing on the gas. The only way I can get the jerking of the car to tone down to a little bit is by putting the car in neutral when I am stopped. 2020. 5. 21. · I have 07 Chevy impala LTZ. My rpm only runs high in the winter! During the day I can go multiple places but at night my rpm will run high. It’s strange. Every time I stop it runs higher and doesn’t go all the way down. Even. If your car revs high when you start it, which is usually above 1000 RPMs, you could have a dirty throttle body or a dirty air idle control valve. Both the throttle body and the air idle control valve control the amount of air that gets into the engine. The throttle body makes sure more air gets into the engine when you press the gas pedal.

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2020. 5. 21. · I have 07 Chevy impala LTZ. My rpm only runs high in the winter! During the day I can go multiple places but at night my rpm will run high. It’s strange. Every time I stop it runs higher and doesn’t go all the way down. Even. That's why it's so important to have a great answer for why you're applying for this position and why you're interested in this position. AC bump AC adds additional load; to meet load engine rpm will go up Battery battery voltage is low or electrical load is high, rpm is increased to have alternator produce more power Check engine light is on depending on what the code is. Topic starter. Hello, my car RPM goes up and down when first started. It varies from 700 rpm to 1000 rpm and only do this when I started the car after a few minutes then rpm is back to normal, every thing is fine. This problem only occur when the car is cool down (leaving it off for a few hours). If the car is hot then it's fine. Answer (1 of 38): If the check engine light is on I recommend having the codes checked. If no check engine light, just by turning the air conditioner on adding another load to the engine can make it idle up. The clutch kicks on and the air conditioner compressor is. How to repair Bad idle speed problem in car. RPM go up and down.

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A leaking/sticking egr valve allows exhaust gases that reduces rpm. A worn out throttle position sensor can raise rpm until the engine is shut off and restarted. Usually this occurs after warm up while driving and restarting drops idle speed back. Only a replacement tps will cure erratic high idling. 2022. 1. 13. · The perfect shift lies slightly before the indicator reaches the red zone. When you stomp on the accelerator, the engine starts to rotate faster, this increases the RPMs. When the driver shifts to a higher gear, the engine rotates a larger cogwheel. This increases the speed of the car and reduces the number of RPMs. Truck stalls on cold startup after putting in reverse or drive. Ford F-150 2009 Engine 100000 miles. Revs up Stalls. 2009 ford f150 lariat 4x4 5.4 3v. First start after sitting overnight. Rpms go up the down right away to about 300 then back up to. 2017. 11. 25. · It is normal for the engine rpm to go up to about 1200 to 1400 rpm when first started and then comes down gradually. This is for emissions during cold start and considered normal. If you feel it is not normal then I would recommend having the computer tested for stored codes and if no codes then you may have a sticking throttle body when cold. .

2020. 12. 23. · 1. Bad Idle Air Control Valve. Oftentimes, when your RPM fluctuates while accelerating, it’s going to be because of an issue with the idle air control valve, or IAC, in your car. The IAC is in charge of controlling the idle.

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You will find that it has either a metal or plastic adjusting screw on top. If you turn it clockwise, it lowers the idle. If you turn it counter clockwise, it raises the idle. If it works like mine did, it does ABSOLUTELY NOTHING. Good luck and be patient. K Katana200sx Wiggle wagon driver... Joined Apr 28, 2002 1,445 Posts #14 · Oct 29, 2002.