Car making loud noise upon startup

My car makes a loud noise when I start it.
Experienced mechanics share their insights in answering this question :
Hello. Diagnosing a noise is difficult without hearing it. This could be a belt, the starter motor, or the engine. I would recommend getting the aid of a mechanic to help isolate the noise and come up with the correct repair.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

Causes include the starter not lining up correctly with the ring gear on the flywheel, missing or damaged gear teeth, or a faulty solenoid. Replacing the starter is most often the right solution. However, if there is damage to the ring gear on the flywheel, the ring gear will need to be replaced.
Dear Tim: It is not unusual to hear some engine when first starting on a cold start. The sound can either be from a hydraulic valve lifter, or piston-to-cylinder wall clearance. As the engine warms, the clearances change and get tighter and noises will usually disappear.
If you hear a “clack-clack” kind of rattle when you start your car`s engine, it could be a sign of piston slap. Pistons move up and down in their cylinders with a tight fit between the piston and cylinder wall.
Although there are a few causes of a squealing engine, one of the most common is a bad or failing serpentine belt. The serpentine belt – or drive belt, as its also known – plays a vital role in the engine. The belt drives many of the engine`s accessories, including the alternator and power steering pump.
Detonation, Pre-ignition (Pinging) Noise

Most people call this a pinging or rattling sound. This noise is caused by an air/fuel mixture in the engine cylinder being ignited prematurely by the heat of compression as the piston is moving up on the compression stroke.

If you hear a rattling noise while driving, the first step is to not ignore it. The sounds and vibrations coming from your vehicle could be signs of a serious mechanical issue. Seek help from a professional who can find the source of the noise before any further damage is done.
A bad starter`s tell-tale noise is loud clicking. It can either have a fast tempo, click-click-click-click-click-click-click-click or a slower lilt of click, click, click, click. No other part makes these noises when they fail, so if you hear either, you`re likely going to be on the hook for a brand-new starter.
2: Unusual noises

The alternator can cause parts of the engine to fail and knock – a broken belt can flap around, and loose bearings can create knocking noises. A wide variety of problems can cause weird noises in your car, but a failing alternator is a likely culprit.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Car makes grinding noise – 1996 Chevrolet Corsica
ANSWER : Hey there, thanks for writing in. I would have a professional mechanic check out the constant velocity joints on your vehicle. One or more of them may be worn enough to cause the noises you describe. S/he can diagnose and replace any failed CV joints.

My car makes a really annoying noise and sometimes dies right after
ANSWER : Hi there. From the description you have provided your vehicle’s moaning noise and intermittent stalling problem could be any number of things. It could be a failed alternator diode making the moaning noise and affecting the idle.

A failed alternator diode(s) allows voltage to flow both directions or no flow at all resulting in noise heard and erratic electrical operation. It could be a faulty idle air control valve. The idle air control valve can make noise and would account for the erratic idle and sporadic dying. It could be an accessory component, such as an A/C compressor, serpentine belt tensioner, or idler pulley, power steering pump making noise and placing undo load on the engine at idle. If you would like to have this done, a certified professional from YourMechanic can come to your car’s location to diagnose the noise and stalling issue.

car making womp womp noise and pop
ANSWER : A common cause of a noise like that is tire belt (internal) separation, flat spot(s) on tire or other tire defects. If the tires end up being excluded during a diagnostic, the CV axles, wheel bearings, and unfortunately the transmission and clutch have to be considered. The noise on turning is suggestive of a possibly defective outer CV joint but very loose tie rods ends and ball joints can sometimes be implicated. Also, it is possible to have a bad strut bearing, in the strut mount. Keep in mind, a "combination" of faults might be in play here. Your best bet is to request a front end inspection/diagnostic during which the responding certified mechanic will get this resolved for you insofar as identifying the root cause(s) and estimating the repair for you.

When the car is about to just fully stop it makes a squeaking noise to what seems to be in the rear breaks
ANSWER : Hello. This is likely the result of the brake pads wearing down to the "wear mark" which a certain thickness on the brake pads designed to alert when it is times to consider replacing the brake pads. This is not emergency critical, however you should consider having the brakes changed very soon. I would recommend having an expert from YourMechanic come to your home to replace the brake pads.

The car makes loud shaking/jarring noise when the steering wheel is only slight turned rightward. There is no noise when turning left.
ANSWER : Hi there. From the description you have provided, the noise you are hearing from the rear of the vehicle and the feeling your vehicle has while driving, should be looked at sooner than later. The swaying (fish-tail) action, could be a broken sway bar. It could also be a broken shock absorber. These are safety concerns that you’ll want to have addressed soon. I recommend having your vehicle’s noise inspected and repaired by a certified technician, like one from YourMechanic.

My car makes several loud clicking sounds that go on for about 15 seconds, is it ok to keep driving the car?
ANSWER : There are a number of things that may cause a ticking sound, however one of the most common is usually when the vehicle is low on engine oil. This can happen when the engine oil is low and the lack of proper lubrication causes the valve train components to make a ticking sound for a period of time usually upon starting the car until the engine has enough time to pump the oil to the rest of the motor. Usually, this does not cause immediate harm to the motor, unless it is dangerously low on oil. I would recommend having a professional from YourMechanic come to your location to take a look at your vehicle and change your oil.

Car makes noise only in the morning
ANSWER : Hello. Thank you for writing in. When the vehicle sits for an extended period of time, the oil collects at the bottom of the engine due to gravity. This causes the engine and components in which the oil lubricates to run dry. There is no problem with this while the engine is off, and every car does this. Now when the vehicle turns on, the engine will need a moment to circulate that oil throughout the engine. Once the oil becomes warm enough to be the viscosity in which the engine desires, and everything has had a moment to become lubricated again, there should not be any more noises coming from the valves. If this is a new noise or it is irritating to you, you can attempt to change your oil or maybe even change the type of oil that you were using. The noise is simply the engine not having oil when it first starts up. But this is normal.

My car leaked all of the oil from the oil filter and now it’s making a loud thumping noise – did the engine pop ?
ANSWER : Hi there:

It’s really difficult to tell you for certain what’s wrong with your Saturn without completing a visual inspection. However, if you had to add half of a gallon of oil, that’s not a good indication that internal components were not unharmed. I’d recommend that you contact a local professional mechanic as soon as possible to complete an engine inspection to determine of damage that has been sustained.