What causes an engine to surge up and down?

What causes an engine to surge up and down?

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.

Why does my car feel like its surging?

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.

Where is the idle control valve on a 2002 Ford Focus?

top of motor by the throttle body. 2 wires on top.

Why does my car pulsate when I accelerate?

According to common lore, a warped rotor is the usual cause for pedal pulsation or vibration in the car or steering wheel motorists experience during braking but, in the cases that are related to the brake system sometimes caused by worn suspension components, the cause for vibration and pedal pulsation is the …

Why does my RPM go up and down while in park?

If the engine can’t keep idling, it will continue trying to get it revved up to compensate. The cause of the erratic engine you’re experiencing could be a vacuum leak, sensor failure, or an EGR system malfunction.

Why does my 2002 Ford Focus idle rough?

The most common reasons a Ford Focus has rough idle are a vacuum leak, an issue with the spark plugs, or a problem with the ignition coil.

What is pedal pulsation?

Most of us have experienced it…you’re driving and apply the brakes, only to feel a wobbly pulsation feeling coming through the brake pedal. Typically, this is the result of a warped brake rotor (rotor is not perfectly flat and parallel with the plane rotation).

Why does my car shudder going uphill?

The most common source of this issue is a loose vacuum line or even loose or faulty motor mounts. It is also possible that your ignition system components (spark plugs, plug wires, and distributor) are worn out and need to be replaced.

What does it mean when your engine is surging?

Learn more A surge is usually caused by a fuel system management or drivetrain operation failure. When an engine’s computer can “hunt” or “surge” at cruising or idle speeds it is searching for program compliance, there is a problem elsewhere in the system.

Can a vacuum leak cause engine surging under cruise?

Vacuum leaks in a MAF system will usually cause a rough idle, but often will not result in engine surging under cruise. Meanwhile, a MAP system extrapolates air flow from the intake manifold’s internal air pressure. A vacuum leak in a MAP system can cause engine surging while cruising.

Can a bad fuel pump cause an engine surge?

Step 3 – If a fuel pump or regulator is failing is can cause an unsteady volume or pressure for the fuel system causing the engine to surge. Learn more Step 4 – Some vehicles are equipped with an inline fuel filter, when this filter become plugged it lowers fuel delivery creating an engine surge. Learn more

What causes a car engine to surge?

Step 5 – If a vacuum line has caused a leak the engine will surge, as vacuum lines age they can become brittle and fall off the engine or accessory. Learn more Step 6 – If an air intake boot becomes torn and develops a leak it will cause the engine to surge. The air intake boot transfers engine intake air volume into the throttle actuator.

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