Rattle noise

have an 05 dakota with 4.7. I had a mechanic replace both cylinder heads at 106k miles due to cracked heads as it was losing coolant out the exhaust. They had the truck for 2 months due the issues which they eventually resolved. Well the very next day on a cold start up I noticed a rattling niose that lasted a few seconds. not a ticking noise. as if it was a timing chain dragging is the best i can describe it. I gave the truck back to them 2-3 more times which they had for extended periods trying to resove the issue. it got to the point where I just gave up with them. Truck is now just shy of
Experienced mechanics share their insights in answering this question :
Hi there. Either the engine’s timing tensioner is loose and not pressurizing up when the engine is started up or the camshaft variable timing solenoid is sticking when the engine oil is thick – cold.

I recommend putting in an engine cleaner in the oil and see if the noise goes away. If the noise goes away, then there was sludge in the timing adjuster or the timing solenoid. If the noise does not go away, then the parts have too much blockage and need either cleaned or replaced. If you need further assistance with your engine having a noise on startup, then seek out a professional, such as one from Your Mechanic, to help you.

How to Identify and Fix Common car Problems ?

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

At the point where the chain guides are worn beyond the ability of the hydraulic tensioner to take up the slack, the timing chain begins to rattle. This noise is caused by the timing chains becoming so loose that they whip back and forth against the guides and possibly the timing cover.
Your car`s intake and exhaust valves can get stuck or wear out. This can lead to premature ignition inside the combustion chambers. It can also cause a rattling noise similar to the sound created by glass bottles clinking together when you accelerate.
One common problem that will cause a rattle at idle is a failing hydraulic valve lifter. The lifters are small parts that open and close the engine valves, activated by oil (hydraulic) pressure.
The most common reasons a Dodge Grand Caravan has a rattling noise are the ball joints, struts or strut mount, or a problem with the sway bar links.
A Rattling that seems to be coming from the front of a car engine could be an indication of a timing belt problem.
Many issues can cause rattling noises when accelerating, including worn-out suspension components, loose heat shields, and low transmission fluid. Worn-out suspension components, a misaligned driveshaft, broken or loose heat shields, and low transmission fluid can all cause a rattling sound when accelerating.
Solenoid valves operating on alternating current may produce a noise accompanied by vibrations. Soft buzzing and slight vibrations are normal in some types of AC solenoid valves. They are the result of alternating current producing a varying magnetic field which acts on the armature of the valve.
A Rattling Noise from the Engine When Accelerating

Noises coming from the engine when you are pushing on the gas could be caused by a loose or weak timing belt, chain tensioner, cracked flywheel, or a broken flexplate. These issues will only get worse over time, not better.

It sounds like a light knocking or growling sound. Gear rattle is an audible noise transmitted from the impacts between the transmission gear teeth. A vehicle engine`s torsional vibrations (momentary angular acceleration) pass through a transmission causing the separation and resulting impact of the gear teeth.
When you let off of the gas pedal, the engine acts as a brake, so it wants to tilt in the opposite direction as when you are pressing the gas pedal. If there is excessive wear in the mounts, this will give it room to move/rattle/vibrate.
When a timing belt tensioner fails, it can result in a number of different symptoms. Symptom 1: Squealing, rattling, or chirping. When the tensioner or tensioner pulley fails, the loss of tension can cause the belt and pulleys to make high-pitched rattling or chirping noises.
Poor Engine Timing

If they are worn and not firing correctly, the timing inside each cylinder will be off. Consequently, you may end up with more than one detonation in each cylinder that causes an engine knock.

Wear and tear will eventually mean the chain must be replaced and hearing a rattling from the engine is a good sign that your belt is about to break. If you suspect that your timing chain needs to be replaced, visit a trusted mechanic as soon as possible.
Driving with a bad timing chain could give you serious engine damage, and it`s also dangerous because it could cause your vehicle to stop suddenly without warning. A timing chain typically requires replacement anywhere from 40,000 to 150,000 miles.
Not for very long, most timing camshaft chains should be changed about every 100 thousand miles providing the engine oil has been changed regularly but if your cam chain is rattling badly then you shouldn`t wait until it snaps because you will be presented with a heavy repair bill and especially if the valves smash …
When your engine is lubricated properly with fresh oil, it should run fairly quietly. As the oil ages and it loses its ability to lubricate the components, the parts will start to move harder against one another causing friction and grinding. These rattling, rumbling, and knocking noises will be hard to miss.
Clicking or a sharp tapping from the valve cover on top of the engine would point to a valve train noise. A dull tapping or slapping sound from the side of the engine block would point more toward piston slap.
One way to check whether a PCV valve is functioning is to remove it from the hose or tube and shake it. If you can hear a metallic rattling noise, it`s likely in good working order. If you do not hear anything when you shake the valve, it is likely that it is no longer opening and closing like it should.
The knocking sound caused by valvetrain problems is sometimes described as a ticking, tapping, or rattling. Often, it`s caused by hydraulic valve lifters that need attention, though it may also be due to too much clearance between the various valvetrain components.
If the lifter noises persist, it can prevent other parts of your car`s engine from working properly and cause some serious damage in the long run.
Over time and normal use, the clearances between the lobes or rocker arms and the valve stems can become greater. This often leads to a clattering noise or more engine vibration than you won`t recognise initially as it increases gradually. However, you would need a valve clearance adjustment to correct.
Many solenoids do emit a soft humming sound when they are in use. If the buzz is not normal, then the problem is probably a bad controller or common wire.
It is normal for the solenoid to make noise, it clicks when the valve is turned on or off. It also is normal for a very soft buzzing sound to be heard when the valve is activated, but you should not be able to hear it unless you put your ear near it.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

I hear a rattling noise when my truck is parked. But when I drive it the noise stops. It sounds like a metal ball is rattling around.
ANSWER : Often, some exhaust components like heat shields or hangers may rust or become loose and rattle over time and is pretty common for the type of sound you’re describing. If you are not experiencing any drivability concerns, the rattle may be from something small. The best thing to do would be to have an experienced technician like one from YourMechanic take a close look around the vehicle under the conditions that makes the noise the most prominent so the technician may offer a more personal diagnosis.

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Rattling noise upon starting and then louder rattling at idle if load is placed on engine such as A/C
ANSWER : Hi there. Given your mileage and your maintenance of the idler pulley, your problem is likely worn/weak hydraulic lifters (or other valve train wear) or the timing gear set. Starting the engine briefly (less than 30 seconds) without the serpentine belt attached, will eliminate noises from all accessories if the problem is with one of them. I would recommend having the engine inspected in person by a professional so that the rattling noise can be diagnosed and properly corrected.

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loud rattling noise when accelerating, somewhat quiet clicking noise when idling
ANSWER : Hello, thank you for writing in. In this kind of situation, the noise may very well be related to the recent work. Start by going back through as best you can without disconnecting too many things to verify your repair. Make sure you did not leave out any screws, make sure all torque specs were followed, make sure nothing is leaking, make sure all your fluids are full and in good condition, and make sure nothing has shifted. Due to it being related to engine speed, you want to make sure the drive belt is also tight and correctly placed on its pulleys. For more diagnostic help, contact our service department to schedule an appointment.

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Just bought a used Forester that started rattling when I’m not accelerating and the wheel is straight. Any ideas on what it could be?
ANSWER : Hey there. The most common source of rattles on Subaru’s are the exhaust heat shields. They can rattle under all sorts of random circumstances. Whenever you turn, accelerate, let off the gas or brake, the motor experiences torque that is dampened by the engine mounts so the passengers won’t feel these vibrations. This torquing will affect the exhaust as much as any other component on the car. Checking for exhaust shield rattles is fairly simple. Use a soft mallet hammer to tap on the shields to see if it rattles. If it does, repairing this is more challenging than locating it. It’s a creative process that can only be decided in person. Of course, you will need to get under that car to access all of the shields.

Other than the exhaust shields, it could be a dust shield on the brakes or a sway bar end link. Both of these are far less common as determined by your description of your symptoms. If it is a sway bar end link, it will rattle most often when you go over bumps. If it is the brake dust shield, you will need to remove the wheel to see if the shield is loose.

If you need further help having this done, a certified professional from YourMechanic can come to your car’s location to diagnose the rattling noise so that this can be corrected.

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Rattle noise.
ANSWER : The rattle you may be hearing is the catalyst which is broken up inside and is partly blocking the exhaust. The blockage may be severe enough to completely block the exhaust causing the no start, or stall and overheat. Have the vehicle diagnosed to see if the exhaust is the cause or if you have internal engine problems.

Either way have the vehicle checked out by a qualified mechanic, they will be able to pinpoint the noise and diagnose the other symptoms you’re experiencing to find what exactly is going wrong. Once that is done, an accurate repair can be made.

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Why is my car making this rattling noise?
ANSWER : Hi there. The rattling noise could be the drive belt or pulley that is loose when not under a load. When turning the wheels or on highway driving conditions, the noise may not be there for the engine is under a load. Try turning on the air conditioner and see if the noise goes away. If so, then the tensioner could have a weak spring.

Billing question was sent to CS for the cost of diagnosing a rattling noise on the engine and the cost of replacing the parts after the diagnosis of a 2000 Toyota Corolla with a L4-1.8L engine.

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It’s making a loud rattling like noise when I’m shifting out 2012 Chevrolet Cruze
ANSWER : Hello – the "rattling noise" you describe could be coming from several components – driven by engine vibration, or by worn bearings in the transmission. Vibration can also cause unrelated components bolted to the engine or chassis itself to rattle. Identifying when the rattle occurs will help diagnose the issue: when the engine is running, whether the car is moving or not, only at higher RPMs, only while shifting gears, only in lower gears(also known as "gear rattle"), etc. I recommend a vehicle noise inspection by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and cost estimate for repairs.

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When engine is cold it makes a rattling noise when you put into gear, but when it warms up there is no noise.
ANSWER : Hi there. There could be a bearing failing in the engine or the power steering pump bearing could be going. First try to turn the steering wheel when the sound is present. If the noise diminishes or dies out, the the power steering pump bearing is failing and the pump should be replaced. If there is no difference in the noise, then there could be a rod bearing issue. I recommend changing the engine oil and putting on a good oil filter with good oil. A dirty oil filter can starve the engine of oil and cause problems. If you need further assistance with the rattling noise on startup, then seek out a professional, such as one from Your Mechanic, to help you.

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