Hiccup while accelerating

Just today I noticed an acceleration hiccup. Every forum says something different. So whenever I accelerate over 2000 rpms, whether is 20 mph or 60, I notice a hiccup, or a jerk in the acceleration and it won't accelerate unless I do it gradually under 2000 rpms.. what could be the cause of this?

My car has 119000 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
There are a number of things that may cause the car to hesitate when accelerating such as low fuel pressure, a dirty or faulty mass air flow sensor, clogged or dirty fuel injectors, a faulty throttle position sensor or potentially a bad fuel pump. This may also be caused by a faulty MAP sensor which relays variances in manifold pressure (indicating changes in engine load/acceleration) to the computer. I would recommend having a professional from YourMechanic come to your location to diagnose and inspect your vehicle.

How to Identify and Fix Common car Problems ?

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There are a range of reasons why your car is juddering when you accelerate. Your vehicle could have dirty fuel injectors, a damaged fuel pump, a blocked catalytic converter, a faulty mass airflow sensor, broken spark plugs, or even an accumulation of moisture.
An engine that is hesitating to accelerate is most likely dealing with a fuel/air mixture that is too lean. Engine`s that are running inefficiently will begin to show signs like hesitation which will only become worse over time.
Wondering why your car feels sluggish when accelerating? It could be due to a dirty air filter, a bad spark plug, or a faulty catalytic converter — among several potential suspects behind sluggish acceleration.
When you press down the accelerator pedal and get minimal output, it could mean you have a problem with your fuel system. The most probable issue is a clogged fuel filter. Your fuel filter works to ensure that dirt and debris do not get into the fuel system.
The causes include a faulty idle air control valve or circuit (IAC), a faulty ECM (not common), faults in the fuel pump control circuit, defective spark plug(s) or ignition system components, faulty fuel injector(s) or injector circuit faults, and PCV system faults including vacuum leaks.
A chugging sound could mean there`s a blockage in the exhaust system. [2] A rattling sound might mean it`s out of alignment. A hissing sound could mean there`s a crack in the exhaust system. Take your car in for an exhaust system check.
One of the most common causes of a sputtering engine is an issue with the vehicle`s fuel system—the filter, pump, and injectors. These three critical components work together to ensure fuel flows smoothly from the fuel tank to your engine`s fuel injectors, and then pumps into the engine evenly.
The most common cause of engine sputtering are issues with the fuel system. These can range from bad fuel filters, fuel pump issues, or fuel injector issues. The other possible source of the problem would be due to poor ignition – think spark plugs or ignition coil problems.
Trouble accelerating can come from a few different engine issues. These include, but are not limited to, dirty fuel injectors, low fuel pressure, and restricted airflow. A problem with the mass airflow sensor, throttle position sensor, or engine speed sensor can also cause a car to have difficulty picking up speed.
Yes. While the damage may seem small initially, the longer you drive with a bad oxygen sensor, the worse the damage will become. Eventually, you may experience rough idling, poor acceleration, engine misfires, an illuminated check engine light, and failed emission tests.
Rough starts, hesitation and poor acceleration are all common symptoms of a bad spark plug. If a spark plug or multiple spark plugs are faulty, they will have trouble creating the spark that causes the ignition process in your vehicle.
If the air/fuel mixture inside the engine becomes too rich, it can disrupt the exhaust, causing car jerks or the accelerator to respond when you press the gas pedal. Other symptoms of a faulty catalytic converter include foul odors and decreased fuel economy.
Jerking or shuddering is usually down to one of two things: Either the metal belt inside the transmission which provides the drive is worn and is slipping, or; the transmissions valve body is faulty and needs replacement. Either way, it`s a fairly major repair.
Culprits include a dirty fuel filter, clogged fuel tank strainer, clogged or failing fuel injectors, or a defective fuel pump. On most vehicles replacing the fuel filter is a DIY operation.
A sputtering engine is a sign of a lean fuel mixture in the combustion chamber. This can happen if you have a clogged somewhere in the fuel system that impedes the delivery of fuel into the chamber. For example, your fuel filter or fuel lines might be clogged.
Fuel injectors get clogged as the engine burns gasoline. Carbon is a natural byproduct of gasoline engines, and it builds up on the fuel injectors. Clogged fuel injectors will make your engine sputter because they cannot spray enough gasoline into the cylinders or engine`s intake manifold.
If your vehicle is low on gas then it`s likely going to sputter. This doesn`t happen to often because most people recognize when they`re getting low on fuel. But it could be the reason your car sputters if you`re not paying attention. Unfortunately, the other causes of a sputtering vehicle tend to be more serious.
If your vehicle`s engine begins to rev to a higher RPM before a gear change during acceleration or experiences a jerking sensation, it`s time to take your vehicle to a repair center for a transmission inspection.
This could be caused by a clogged fuel filter or a faulty oxygen sensor. Both of these issues can cause your car to run less efficiently, which can lead to shaking while accelerating. If you suspect that your fuel injector system is the problem, it is best to bring it to a mechanic for diagnosis and repair.
One of the most common causes of those issues is your car`s throttle position sensor, also known as the TPS. The little sensor plays a big role in how much fuel your engine gets at any given point in time, and if it`s not functioning properly, you may notice changes in how your car runs and accelerates.
A poor fuel delivery drains out the power of the engine resulting in poor acceleration. Fuel filter – A dirty or clogged fuel filter affects the fuel supply to the engine and thus the engine has low power causing poor acceleration. Other parts of the fuel system are the fuel injector and fuel pump.
If you`re driving at freeway speeds and notice your engine sputter or jerk, you may have a failing fuel pump. This problem is caused when the fuel pump can`t deliver a smooth flow of fuel to the engine; periodically, your engine receives only air when it was expecting to receive fuel.
The most likely cause of the shuddering most often happens in the vicinity of your car`s rims and tires. They plant your car to the road, and if anything is broken, will feel it. On a serious note, it may be a broken transmission mount or a broken caliper.

Relevant Questions and Answers :

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Hiccup while accelerating
ANSWER : There are a number of things that may cause the car to hesitate when accelerating such as low fuel pressure, a dirty or faulty mass air flow sensor, clogged or dirty fuel injectors, a faulty throttle position sensor or potentially a bad fuel pump. This may also be caused by a faulty MAP sensor which relays variances in manifold pressure (indicating changes in engine load/acceleration) to the computer. I would recommend having a professional from YourMechanic come to your location to diagnose and inspect your vehicle.

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Intermittent throttle position vs acceleration — either a lot or a little to accelerate from a stop and maintain speed.
ANSWER : Hi there. The issue seems to be with the downshift solenoid in the transmission. As the throttle is demanded by the gas pedal, the downshift solenoid overrides the line pressure in the transmission to the lower gears to allow the transmission to downshift. I recommend replacing the downshift solenoid. If you need further assistance with your vehicle not downshifting, then seek out a professional, such as one from Your Mechanic, to help you.

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EGR valve is closed when I accelerate and it opens when I remove my foot from accelerator. What is wrong with the EGR valve?
ANSWER : Hi there. If you are getting the EGR valve to operate in the opposite times, then check the harness for power and see if the power is on with the engine at idle. Check the voltage and there should be a 5 volt reference going in and 0 reference going out. If the valve has a 5 volt reference going in and a 5 volt reference going out while the engine is at idle, then the valve needs replaced. If the valve has a 5 volt reference going in and a 0 volt reference going out while the engine is at idle, then the computer needs flashed (reprogrammed) or replaced. If you need further assistance with your vehicle, then seek out a professional, such as one from Your Mechanic, to help you with the EGR functioning incorrectly.

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When driving at a steady rpm or passing speed, my truck hiccups really bad. I replaced the valve cover gaskets&harnesses already.
ANSWER : Hello.

From what you described, it appears that your vehicle may be experiencing some sort of misfires. This can be caused by a few things. However, if the valve cover and harness have been replaced then they are likely not the cause of your symptoms. Issues with the turbo, fuel system, or engine management system can all cause a vehicle to experience misfires. As the possibilities could be many and possibly difficult to diagnose, I would recommend having a professional technician look at the misfiring issue.

Regards,

Eduardo
YourMechanic

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black smoke from exhaust only while applying more accelerator especially more than 2000 rpm…no smoke in idle or slight accelation
ANSWER : Hi there. I understand your confusion. It may be advisable, to find another repair facility. The exhaust smoke (black in color) is typically, an indication of too much fuel being delivered to the engine. This may be, the result of a faulty fuel pressure regulator. The dirty air filter, would of been another possibility, had it not been recently checked. I recommend having your vehicle’s black exhaust smoke be diagnosed and repaired by a certified technician, such as one from YourMechanic.

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Random hiccups and fuel problems, what could it be?
ANSWER : The fuel pump relay is most likely staying engaged even though you have turned it off. A malfunctioning fuel pump relay can also lead to the pump not turning on at all or it shutting off intermittently and without warning. This could be dangerous if it happens while driving.

The fuel pump relay is inside the Total Integrated Power Module (TPIM) and is not serviceable separately, but there is a recall campaign RC-R09-15 that covers your vehicles TPIM replacement. Contact your local dealer and supply your vehicle information as requested in order see if your vehicle is covered.

If your dealer cannot cover the repairs, contact YourMechanic for a diagnostic check and quote for the repairs needed.

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Hiccups in my 2005 Honda Accord
ANSWER : Hello, thanks for writing in. I’d be happy to provide my insight. Most of the time that this occurs, it is because of a slight misfire, or it is due to an engine mount problem. I usually start by checking the engine mounts. If those are fine then I install a computer scan tool to monitor the sensor readings and to see if there are fluctuations in engine rpm. This can be caused be a fuel injector that is a little dirty or an ignition coil that is failing. Both are common problems. I would wait to change the belt tensioner pulley until it is confirmed that that is a problem.

If you would like help, consider having an expert automotive technician from YourMechanic come to your home or office to inspect and diagnose this issue for you, and make or suggest any repairs as needed.

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Car hiccups or slight jerks at steady rpm
ANSWER : Ignition failures are more common on your car than fuel injector failures, and the mileage would be about right for coil failures. It takes several subsequent misfires for you to be able to notice it on the road, so if it happens again you should see a check engine light. When that occurs, there will be some trouble codes stored to help in the diagnosis of the problem. It can be tricky to diagnose a tempermental problem, so if you want some help with this you can contact Your Mechanic to have a technician come to your home or office to check out your BMW and let you know what it’s going to take to solve your problem.

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