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Why does my car surges when I stop?
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 rev when idle?
Erratic engine idle can be caused by various factors, but the most common and likely cause is a dirty or malfunctioning Mass Air Flow (MAF) sensor. This is a device found in fuel-injected cars and measures air flow so that the appropriate amount of fuel can be injected.
Why does my car RPM go up and down when stopped?
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.
What causes engine over revving?
The most common cause of this revving is either a stuck throttle or the mass airflow (MAF) sensor. This fault should be addressed as soon as possible for normal operation as this revving can become dangerous if the vehicle is allowed to accelerate unintentionally.
What should the RPMs be at idle?
For regular cars, idle speed is typically between 600 and 1,000 rpm, just enough to keep the engine’s ancillary systems going, but not enough to move the car forward much.
Will over revving damage engine?
If an engine goes overspeed, commonly called “over-revving”, damage to the piston and valvetrain may occur when a valve stays open longer than usual. Valve float can possibly result in loss of compression, misfire, or a valve and piston colliding with each other.
What causes car engine to rev up at start up?
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.
Why does engine surge when car is at a stop?
Common reasons to increase speed might include when the transmission is placed in gear, when the air conditioner is selected, when power steering is under high demand (sharp turns), when large electrical loads are placed on the charging system, and of course, when the engine is cold.
Why does my intermitten engine keep revving?
The throttle is electronically controlled in this car, but the actual throttle plate itself sometimes can hang up if there’s dirt on it. So if you’ve been driving along and then you come to a stop, the throttle might hang up and not close completely, causing the engine to stay at, say, 2,000 rpm, rather than returning to idle speed right away.
Why does my car rev up at a stop sign?
When I am stopped at a stoplight or stop sign, my car’s engine unexpectedly revs up. If I put it in neutral or park, it subsides. It happens only occasionally, sometimes months apart. I have reported this to Honda on two occasions, and have brought it in for a testing procedure. Both test sequences came up with nothing. I don’t know what to do.