Turn the engine off again, and reattach the air intake duct work to the throttle body. Start the engine and rev and hold to 1,500 to 2,000 rpm until no white smoke is coming out of the exhaust pipe. Cleaning the
Idle Air Speed Control Valve with aerosol throttle cleaner
can often solve an idle problem.
What can cause engine surging?
- Clogged fuel filter.
- Failing fuel pressure regulator.
- Faulty catalytic converters.
- Vacuum leaks from the hoses.
- Wrong air intake from bad EGR system and EGR valves.
- Weak ignition from damaged spark plugs.
- A faulty electronic control module.
Why does my car surge when stopped?
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.
Can bad spark plugs cause surging?
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.
What does it mean when a car surges?
Surging is associated with
a sudden increase in speed that occurs while trying to maintain a constant one
. This is a sign that your fuel pump may have sufficient wear and tear and that its irregular resistance within the motor is creating an inability to maintain consistent pressure resulting in surges of power.
What would cause my engine to surge at idle?
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.
What causes rpms to fluctuate at idle?
Why does my engine’s RPM seem to fluctuate (runs rough)?
Many engine performance problems can be linked to maintenance issues such as stale fuel, dirty air filter, fouled spark plug, and deteriorated oil. … Engine hunting and surging at idle is usually caused by
a fuel delivery, air leak, or governor system problem
.
What causes engine to rev up and down?
If the engine can’t keep idling, it will keep trying to get the engine 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.
Can a faulty oxygen sensor cause engine surging?
Oxygen sensors are among the most interesting and important sensors on your engine. … Surging is among the many problems a failing O2
sensor can cause
, but it isn’t the only one.
What causes a small engine to rev up and down?
A lawnmower that hunts and surges may be experiencing something as simple as an airflow issue.
If the air that the engine requires to run is blocked
, especially sporadically, it can cause the engine to slow down. When the blockage moves or clears, the engine may suddenly rev up in response.
What problems can a bad spark plug cause?
An
engine will misfire
when bad spark plugs delay the combustion effect. A misfire means one or more of the cylinders in your engine are not producing the power they should. Misfiring motors work harder to maintain power, which saps fuel economy. It also leads to long-term damage if you do not fix the problem.
Can a bad fuel pump cause surging?
Car Surging
Irregular resistance inside the fuel pump
motor may cause vehicle surging, and indicates a fuel pump in need of repair. … If this happens often, it may be because of problems within the fuel pump.
What are the signs of a bad fuel pump?
- Sputtering Engine. Your fuel pump is telling you something if your engine starts to sputter once you’ve hit the top speed on the highway. …
- Overheating Engine. …
- Low Fuel Pressure. …
- Power Loss. …
- Surging Engine. …
- Gas Mileage Decrease. …
- Dead Engine.
Can a bad fuel pump cause a rough idle?
What to Look For: A bad fuel
pump can cause difficulty when starting the vehicle
, a rough idle, and stalling. Clogged Fuel Filter – The fuel filter filters the contaminants from gasoline. Over time it can become clogged, which slows the flow of fuel.
What are the symptoms of a bad idle control sensor?
Common signs include
irregular or unusually high idle speed, the Check Engine Light coming on, and stalling while idling
.
What would cause a rough idle?
Causes of a rough idle. Many different problems could result in a rough idle for your car or truck, including:
dirty fuel injectors
, clogged air filters, bad spark plugs, and a variety of exhaust system issues.
