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not enough information as we cannot hear sounds from print
what make and model engine size , when does the sound appear , is it when stationary but happens when the engine is revd up , at what road speed does it come in, is it a grinding , rumbling, scraping , knock, rattle as weird means nothing
if the knocking is occurring while vehicle is in motion it can be a driveshaft cv joint bad..if it occurs while not moving but in gear, it could be the exhaust rattleing under the car..may also be the front end suspension bushings worn..
This is hard to say with hearing the noise but try to pin point the noise , is it coming from the top or bottom of the motor , the knocking noise could be a bearing in the lower motor or may be something else making it sound like a bearing,
The knock sensor is located under the intake manifold to replace do the following Disconnect the negative battery cable. Remove the intake manifold. Disconnect the sensor connector. Remove the sensor from the engine block. Installation is the reverse of the removal procedure
If it sounds like a rapid tapping (like someone is using a small hammer to hit the engine block really fast) then you probably have spark knock. It happens to older engines. As the engine gets older, carbon builds up inside the combustion chamber and effectively increases the compression ratio. Since you are using low octane fuel, it doesn't resist spark knock as well as high octane (this is a reason performance cars use high octane) and thus you get spark knock. An easy way to tell for sure it to run a tank or two of 91 or better octane through. Since you'll be mixing it with 87 octane, it could take two fill-ups to see a result. If the knock goes away, then you know it is spark knock. If not, or the knock I described is not what you hear, then I would need a better description (perhaps a video) of the sound you hear. If it is spark knock, you can run a cleaner through (Sea Foam works great) the engine and that usually fixes spark knock. Sea Foam works best when given to the engine through a vacuum line. Don't add too much at once, it will hydro lock the engine. Just let it **** in a bit and when the idle comes back up, put a bit more in. I would pour half the can in the tank and feed the other half to the engine through the vacuum line. Be prepared, when you feed it to the engine through the vacuum line, it is going to smoke a lot until it burns off the Sea Foam. That is normal and will go away after a short drive.
Chipping can be caused from a bad bearing that needs to be replaced or lubricated. It could be inside the alternator. power steering pump, idler pulley, Whater pump, AC compressor, and so on. Use a long handle such as a broom stick and place the stick to each item that is belt driven. Place it at a secure place such as the housing so the stick does not get near the belt. As the engine is running place your ear at the other end of the stick. This works as a Stethoscope same as a doctor uses. The chirpping will be hear the loudest at one of the belt drive accessories during your testing