Why does my car make a rattling noise when it starts up?

It doesn’t do it when cranking, it’s only when the car first starts up (more noticeable on cold start-up). It’s also not every time you start it, only when it’s been sitting awhile (such as over night). I’m not exactly sure what it is but it’s pretty loud. After about 10-15 seconds or so, the sound settles and is no longer audible.

What causes the kocking sound on start-up that disappears?

Depending on how cold it is or I guess long it’s sitting, I’ve heard it do it for about 30 seconds and then stop. Sometimes turning the steering wheel will cause it to stop or quieten it up until it completely disappears. Once it disappears, u never hear it for the rest of the day. As for the flex pipe, just look under the car at it.

Why does my car make a percussive noise?

Moving on … Bad ball joints, worn control-arm bushings or faulty stabilizer link-pins can cause uncivilized sounds, but other chassis components could be to blame as well. Even a loose exhaust system can flop round and make percussive noises. 3. Porcine Squealing

Why does my car make a rattling noise?

If you hear a rattling, pinging or hammering sound beware. This racket is associated with three separate but related combustion problems: detonation, pre-ignition and spark knock, all of which can be extremely harmful. They often occur during acceleration or while the engine is under load.

Why does my 440 Mopar make a rattling noise?

MY 440 mopar runs incredible at idle to 1500 rpm, but around 2000 rpm, the engine becomes overcome with loud rattling, noise, thousands of “rocks gone wild” come from the engine or transmission. It sounds like the motor is falling apart.

Why does my car make a knocking noise when I idle?

Loose torque converter-to-flywheel or flywheel-to-crankshaft bolts will sound similar to bearing knock. This condition produces several raps during quick acceleration on a free running engine. Depending on the idle smoothness, when the transaxle is in gear, the noise may or may not appear.

Why do I hear a ticking sound in my engine?

Rod knock could be the possible reason for a major engine issue. When the bearing connected to the rod wears off or gets damaged, the rod knocks around the crankshaft and creates a metal-to-metal sound. You will hear a rhythmic, loud ticking noise in engine when acceleratin g.

Why does my Mazda 5.7 make a ticking noise?

If the exhaust bolts are fine and your 5.7 doesn’t have an exhaust leak, the most likely reason behind the ticking/tapping noise according to some mechanics is inadequate lubrication of the hydraulic roller lifters. At first, it starts as a ticking noise and then it gets worse and worse until the engine starts to misfire on hard acceleration.

Why does my engine make a ticking noise when I warm up?

Not sure. The other possibilities for this noise in general are: 1) exhaust leak at the manifold. Judging by numerous YT videos, an exhaust leak at the manifold makes the same bad ticking noise and goes away when warmed up; and 2) Piston slap. GM will claim piston slap is normal but it’s not.

Why does my car make a tapping noise when it gets warm?

Exhaust manifold gasket (to the head) is bad. So when it gets warm the bad gasket expands and stops the noise. It’s not the valve lifters because the noise goes away when warm and not really heard when gas pedal isn’t engaged.

Why is my push mower making a noise?

If the lifter is left that noisy it will destroy itself. The noise is caused by slack in the valve train because the lifter does not have enough oil pressure to preload the push rods. The lifter has very small passages in it and over the miles can become clogged with sludge.

Why does the noise in my Jetta go away?

Maybe, just maybe, the noise the Jetta makes goes away because of better oil flow throughout the engine when hot.Pushing down the gas pedal probably raises the engine noise and drowns out the other noise. hey, a bottle of Lucas costs $10. Replacing the manifold a few hundred. What’s the damage trying it? Deleted.

What can I do to make my catalytic converter stop rattling?

If you usually use the lowest octane gas available, try running a few tanks of high-octane gas through your vehicle. It may be enough to increase airflow and stop rattling noises. Similarly, certain additives can be purchased that will help clean out your cat when they’re added to your gas tank.

Why does my Mitsubishi Outlander make a loud knocking sound?

When my Mitsubishi Outlander has been sitting for awhile and I turn the engine over on the right side of my car it makes a loud knocking sound but only for a moment the sound goes duller as my car warms up. My car has 146068 miles. My car has an automatic transmission.

When does a car make a rattling noise?

You may hear them when you start your car, when you drive it or when you apply the brakes. They may occur only when the engine is cold, or when it’s fully warmed up. Rattles may happen only upon acceleration, deceleration, going over bumps, rounding a corner, or during some other specific set of circumstances.

Why does my catalytic converter make a rattling noise?

The converter can be damaged by thermal shock or an impact, which can cause part of its internal structure to break off and cause a rattle. In extreme cases, this can sound like a box of rocks being shaken. The converter doesn’t fail by itself; something has to cause it to fail, and that should be identified before it is replaced.

Why are my heat shields rattling under my car?

These heat shields are made of thin pieces of metal, and are placed between these components and the underfloor of the vehicle. They have become a common source of rattling noises under the car. Over time, heat shields can rust out or become loose and get detached from their mountings.

Why does my AC rattle when I turn it on?

The noise would start when the compressor engages due to the increased load on the engine. Compressor Clutch: The compressor clutch is a high-wear item, and if it’s worn out, it can create a rattle during operation. Some vehicles can have only the clutch replaced, but some require replacement of both the clutch and compressor.

Why does my Ford TSB make a rattling noise?

Think I might have found the problem Ford TSB 06-8-15 and on numerous posts in some other forms regarding a loss of vacuum in the 4wd IWE system. So it appears it is either caused by a bad IWE solenoid or one of the vacuum lines has a hole or loose connection. Sounds strange, at least from my speakers, let us know how that turns out.

Why does my GMC Yukon make a rattling sound?

I have a 96 GMC yukon with 160k miles and I hear a rattling sound whenever I go uphill or accellerate quickly (i.e. getting on to the highway). These are the only times it happens. I can rev the engine in park or neutral and cannot hear the rattling. Anyone know what’s causing this? 160K? Congratulations!

Why does my undercarriage make a rattling noise?

So it appears it is either caused by a bad IWE solenoid or one of the vacuum lines has a hole or loose connection. Sounds strange, at least from my speakers, let us know how that turns out.

Why does my car make a rattling noise under the hood?

As a result, there’s a wide variety of sources that can cause rattles. Let’s start with rattling noises under the hood that are caused by oil or fuel-related problems: Your engine oil pump circulates motor oil through the engine, lubricating the internal moving parts.

When do you get paid for an engine rattling noise?

Get paid quick in as little as 24-48 hours! An engine rattling noise, or a clicking sound in an engine, can spring up from a number of sources.

What kind of noise does a car make when it starts up?

It’s like an extremely loud rattling/clanking noise. It doesn’t do it when cranking, it’s only when the car first starts up (more noticeable on cold start-up). It’s also not every time you start it, only when it’s been sitting awhile (such as over night). I’m not exactly sure what it is but it’s pretty loud.

Why does my car make a knocking noise when I Turn on the engine?

The engine is accelerating or lugging under a load. This allows intake vacuum to suck some exhaust in; through the (EGR) valve to dilute the air/fuel mixture slightly. This lowers combustion temperatures and prevents engine spark knock.

Why does my car knock at the gas station?

If the gas station or their refiner is cutting corners and the fuel is not 87, it may knock. The fix for this is to try a tank of mid-range or premium gasoline. Or, if you always buy gas at the same gas station, try a different gas station. Also, don’t buy the cheapest gas you can find.

Why does my car make a rattling noise when I start it?

An engine rattling noise, or a clicking sound in an engine, can spring up from a number of sources. Whether it’s engine knocking when accelerating or some kind of spark knock or just a general engine noise, some are more serious than others, but there’s one thing that’s true of them all: it’s never good to leave it alone.

Why do I hear a knocking noise in my engine?

When your engine is running smoothly, the air/fuel mixture burns up in a single, controlled detonation inside each cylinder. Detonation knock is a knocking noise that you’ll hear when the air fuel mixture in the cylinders is detonating in more than once place at a time.

What kind of engine noise does a 94 Silverado make?

I wanted to add my recent experience to this thread…I recently purchased a 94 Silverado with the 4.3L balance shaft design. 139k miles and 180psi on all cylinders. Loud rattling noise just over 1K rpms.

Why does my car make a rattling noise when it starts up?