Why does my engine 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.
Is engine sputtering bad?
In internal combustion running vehicles, and incomplete combustion will cause a sputter. And while a sputtering engine might not seem like a serious issue, it often results in an expensive repair when ignored. The source of the sputter needs to be diagnosed immediately by a professional mechanic.
Why does my RPM keep going up and down?
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 does it mean when your RPM goes up and down?
It sounds like you have a dirty or failing air control valve. The job of the idling air control valve is to bring this deceleration down to a slow and smooth idling rather than cutting off the fuel supply and causing the motor to die. …
What makes a Harley Davidson engine sputter at idle?
On the Evolution and later engines, the carb is designed as a “spigot seal” type carb. In other words, it just pushes into a seal instead of bolting on like the older carbs did. This means that the carb has to be aligned correctly or an air leak can occur around the seal.
Can a Harley Davidson run at low speeds?
However, since I bought it the engine is not running well at low speeds. It basically runs fine under mild/strong acceleration or at full highway speed and seems to idle normally when the bike is started.
Why does my car sputter when I Turn on the engine?
The fuel filter ‘s job is to filter the fuel going to the fuel injectors and then enter the engine. A clogged fuel filter can cause the engine to get too low fuel pressure or cause a clogged fuel injector. Low fuel pressure will cause the engine to run very leanly, and therefore it may cause the engine to sputter.
Why does my bike sputter at cruising speeds?
If you haven’t messed with the air filter assembly there is one other thing that I’ve seen cause this problem. Your bike has two vacuum operated devices on it. One is the VOES switch and the other is the fuel petcock. The VOES switch is part of th igniton system and the petcock is the fuel valve on the fuel tank.