Why is the car seriously loud during acceleration or just mid to high rpms it is 99 corolla ce roughly 122k m?

Answer 1

It depends on where the noise is coming from, mine blew the donut gasket where the header pipes come together to connect to the exhaust system. It isn't too hard to replace, might as well change the shoulder bolts that hold it together at the same time. I suggest you get the parts from the dealer, the aftermarket gasket I bought the first time was by "Felpro" and while they showed me the listing and they had it correct the gasket was not right. You should be able to identify if this is the problem by running the engine with the transmission in park, rev it at the throttle by hand and listen. If you do this when the engine is cold you have a few seconds where you can place your hand down along side the exhaust header and feel for air. I say seconds because I burned my wrist within 10 or 15 seconds so it heats up fast. To do this you have to remove the heat shield, or you can probably jack the car up, block it for safety (making sure the parking brake is set and the transmission is in park) and climb under behind the front wheel. Have a friend or your wife rev the engine (make it a family affair, I have my 8 year old son, 19 year old daughter or my wife help me bleed brakes etc.) Feel for air flow and listen for noise, even if it isn't the donut gasket (that is what it really is called) you should be able to isolate the problem if it is exhaust related. I had a similar problem. Mine turned out to be the tensioner on the timing chain. It had worn almost completely away. Use an automotive stethoscope to isolate where the noise is coming from and you should be able to figure out the cause fairly easily.