Engine surges when depress accelerator past a certain point


Why does my car surge when I accelerate?

Usually, there are three leading causes behind car surging when accelerating. First, it can be that your fuel is making its way to your engine correctly. Second, it can be due to faulty torque converters. Lastly, engine misfires can come from a loss of vacuum coming from the intake system.

What would cause an engine to surge?

If an engine is not getting enough fuel (this is called “running lean”), due to fuel pressure (regulated by the fuel pump and regulator), restricted fuel injectors, a vacuum leak or really anything that throws off the fuel mixture going in to the engine, this can cause the surge.

How do you fix an engine surging?

The cure for this condition is to clean the valve with some aerosol throttle cleaner or engine top cleaner. Here’s how to clean the IAC valve: Disconnect the air intake ductwork from the throttle body. Start the engine, then increase and hold the idle speed to 1,000 to 1,500 rpm.

Can spark plugs cause surging?

3. Surging and Lagging. Another good indication that your spark plugs are dirty or worn is if your vehicle experiences surges of speed, resulting in a jerking acceleration. These surges occur because your spark plugs are not igniting the fuel in your engine at the proper rate, resulting in an uneven speed.

Can a faulty oxygen sensor cause engine surging?

In fact, the old O2 sensor was one of the first ever used to electronically modulate the ratio of fuel and air used by the engine — in a time even before what we would recognize as fuel injection today even existed. Surging is among the many problems a failing O2 sensor can cause, but it isn’t the only one.

When I press the gas my car jerks?

Clogged Catalytic Converter



Your catalytic converter is responsible for regulating the emissions coming out of your car. Sometimes the rich mixtures of air and fuel that flows through your catalytic converter can clog, which can result in a jerking or stuttering motion when you press the gas pedal.

What are signs that your fuel pump is going out?

If you notice these six signs, consider taking your car to your local dealership to have the fuel pump replaced.

  • Whining Noise From the Fuel Tank. …
  • The Engine Sputters or Surges. …
  • Trouble Starting the Car. …
  • Loss of Power Under Load. …
  • Reduced Gas Mileage. …
  • Stalling at High Temperatures.


What does engine surging mean?

Engine surging is usually a warning sign that your car or truck is having combustion problems. Since a vehicle’s ignition wires and spark plugs play a major role in proper engine performance, it is likely time to check your engine’s electrical components.

What does car surging mean?

Engine surging occurs when an engine starts readily and speeds smoothly, but then surges in speed or misfires after a few minutes of constant speed. When fuel filters are forced open in this manner, fuel pressure rapidly rises, injecting more fuel into the engine than it requires causing the vehicle to surge.

Can a transmission cause surging?

“Surging” is often a sign of contaminated transmission fluid. When your transmission becomes too polluted, your vehicle may begin to jump forward or fall back for no apparent reason. Again, a transmission fluid flush could be all you need to solve this problem.

Can a dirty fuel filter cause engine surging?

Poor Engine Performance



Under heavy loads, a clogged fuel filter may cause the engine to randomly hesitate, surge or sputter.

How is engine surge diagnosed?

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See that spot of air you're going to take your fingers and bring it right over the top of that. And if the idle smooths. Out that iac valve is stuck wide open. And that's a quick diagnostic.

What does engine surge feel like?

What Does Engine Surge Feel Like? Basically, if your engine surges, you will notice your car slow down while the engine is stuck. The tachometer can range from 1,500-12000 rpm, for instance. The motions of your hips may become soft and rhythmic.

Why does my RPM needle bounce when accelerating?

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.

Why is my engine hunting?

Engine hunting and surging at idle is usually caused by a fuel delivery, air leak, or governor system problem. Cleaning/overhauling the carburettor, adjustment of the governor, and/or changing the air filer may be required.

What causes governor hunting?

A governor is said to be hunt if the speed of the engine fluctuates continuously above and below the mean speed. This is caused by a too sensitive governor which changes the fuel supply by a large amount when a small change in the speed of rotation takes place.

Why do my rpms bounce at idle?

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 mass airflow sensor, or a faulty throttle position sensor.