Engine hesitation can be a result of low fuel pressure, vacuum leaks, worn or dirty spark plugs or bad spark plug wires. A weak ignition system can lead to misfiring, which can also cause hesitation.Know More
Engine hesitation is usually caused by an air/fuel mixture that is too lean, meaning there is too much air and not enough fuel in the engine. This makes it hard for the spark plugs to create the combustion needed to sufficiently power the engine. This problem may be caused by a bad air flow sensor, a faulty throttle position sensor or poor computer operation. If the vehicle's computer is reading the signal from the air flow sensor incorrectly, it can cause the computer to fail to add enough fuel to the mix, making the mixture lean, and causing hesitation and drag.
It is possible to find out the cause of hesitation by running a few tests. Computer scans can pull fault codes, including misfire codes, and additional tests will help to check fuel pressure and find vacuum leaks. Pulling the spark plugs is another test that is easy and inexpensive to perform, since hesitation can be caused by a spark plug that is dirty or improperly gapped.Learn more about Car Parts & Maintenance
There are numerous reasons a car stutters when accelerating, including vacuum leaks, wiring issues and faulty sensors, according to AutoHub 360. In some cases, bad weather can cause this problem. When the engine is cold, moisture can collect on the distributor cap and cause the electrical current to the engine to misfire. When a car stutters during acceleration, it is a symptom of an underlying engine issue.Full Answer >
Whistling noises that occur when accelerating a vehicle are often due to vacuum leaks under the hood. If a vacuum leak is the cause, the car is likely to make the same noise upon pressing the accelerator when the vehicle is idling.Full Answer >
Restricted fuel delivery and malfunctioning spark plugs are the most common reasons for cars to hesitate during acceleration. The first step to identifying the cause of this is to find out if the car is fuel-injected or if it has a carburetor. Fuel-injected cars and cars with carburetors deliver fuel differently, so there are different ways to diagnose and fix problems with acceleration.Full Answer >
A loose or slipping engine belt or a misaligned accessory drive pulley could cause a car to squeal upon acceleration. Engine belts and drive pulleys are used to power the water pump, air-conditioning compressor and the alternator of an automobile.Full Answer >