Rattling noise low rpms

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.

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.

ANSWER : Hi there – the noise you describe appears to be affected by engine speed as well as temperature. The noise could be from the power steering pump, alternator, water pump, or serpentine belt idler pulley – something that is engine-driven. The first task would be to check the power steering fluid reservoir. Given your mileage, it might be a good idea to have the power steering fluid flushed, and the filter replaced. I recommend a noise inspection performed by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, and give you an accurate assessment of damage and cost estimate for repairs.

ANSWER : Hello. Most of the time this is caused by the timing chain making noise in the engine. I will usually check the oil and replace it with the right oil and filter to see if it helps. A poor quality filter or the wrong oil can cause this. If the oil is fine then the timing chain itself may be failing or it may be a tensioner issue. If the chain seems fine then the noise may be coming from the exhaust if there is a loose heat shield. If you want some assistance with this, consider YourMechanic, as a certified mechanic can come to you to [diagnose where the rattling is coming from] https://www.yourmechanic.com/services/loud-squealing-or-rattling-is-coming-from-engine-inspection

ANSWER : Hi there. The sound that you are hearing is probably from the blower motor to the heater / air conditioning evaporator. Remove the fuse to the blower motor and see if the sound stops. If the sound stops, then the motor or the squirrel cage is bent and rubbing. If the sound is still there when you remove the fuse, then it could be the alternator or power steering pump transmitting the sound through the cabin area. If you need further assistance with locating the source to the high pitch sound near your glove box, then seek out a professional, such as one from Your Mechanic, to help you.

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.

ANSWER : The misfiring could be ignition or fuel related. If the plugs have not been replaced, on the timetable set forth in the maintenance schedule, that is certainly one possibly. Also, the plug wires could be tested. Diagnostic Trouble codes that "refer" to oxygen sensors do not always set because the sensor itself is bad. Lots of other faults can cause those codes. Oxygen sensors should be tested for function prior to being condemned on the basis of a "code" but if yours are original, and thus have 170,000 miles, it would not be unreasonable to replace them as part of the diagnostic and repair (and, of course, replacement may resolve part of the issue you are having). Codes related to any misfiring need to be scanned by a Mechanic and evaluated. If there are no such codes, a scope should be used to look at the firing patterns in the cylinders to infer where the fault lies. The ticking noise is probably related to the valve train. One possibility is low oil pressure and such is tested with a pressure gauge. I recommend you request a misfiring diagnostic to get that problem resolved as it is the most basic and then deal with the Codes referencing the O2 sensor(s) and finally the noise.

ANSWER : The rattling sound can depend on where the sound is coming from. This can be loose muffler mounts if coming from underneath the car or other loose engine component mounts if coming from under the hood or potentially loose suspension components if coming from underneath the front of the car. The jerking may be related to what is called a mass air flow sensor which is a unit that regulates air flow into the intake as it is mixed with fuel prior to being injected into the motor. When this is not working correctly, this can cause the jerking problem you are describing. I would recommend having an expert from YourMechanic come to your home to diagnose the jerking and make repairs.