Metallic whistling noise from a 2008 Honda Civic, any ideas?
The noise seems to come from the valve cover area or somewhere from the very center of the engine bay, not from the belt area of the engine. The noise does not change in pitch when the engine is revved but does get louder till about 2,000 RPMs. The noise also only comes up when the engine is slightly warm and was just started up, then dies off after about 5 minutes of running. Parts and fluids replaced were air filter, PCV valve (with OEM Honda valve from Honda) OEM transmission fluid drained and filled 3 times, oil was changed recently, new spark plugs (not boots or wires, NGK iridiums are in there), and a new belt tentioner pulley put on with new belt. The EGR valve was also cleaned out and there are no check engine lights or codes. Also took it to honda and they aren't able to figure it out. Also had a valve adjustment done by Honda. (Noise was there prior to all services).
Added (1). Noise sounds very close to wood being cut on a bandsaw, but not as aggressively loud. Its not as screechy and a little lower pitch than the sound in this video.
The noise seems to come from the valve cover area or somewhere from the very center of the engine bay, not from the belt area of the engine. The noise does not change in pitch when the engine is revved but does get louder till about 2,000 RPMs. The noise also only comes up when the engine is slightly warm and was just started up, then dies off after about 5 minutes of running. Parts and fluids replaced were air filter, PCV valve (with OEM Honda valve from Honda) OEM transmission fluid drained and filled 3 times, oil was changed recently, new spark plugs (not boots or wires, NGK iridiums are in there), and a new belt tentioner pulley put on with new belt. The EGR valve was also cleaned out and there are no check engine lights or codes. Also took it to honda and they aren't able to figure it out. Also had a valve adjustment done by Honda. (Noise was there prior to all services). Use a length of hose, say 4 to 5 feet, like a stethoscope. Hold one end to your ear and move the other end around the engine. You can pinpoint where sounds are coming from surprisingly easy with this simple technique. But be careful not to get it caught in moving parts like belts! It must have a turbo Check or replace the PCV valve. If it is plugged up you may be hearing pressure blowing out of a gasket or seal to relieve the pressure in the motor.
It must have a turbo
Check or replace the PCV valve. If it is plugged up you may be hearing pressure blowing out of a gasket or seal to relieve the pressure in the motor.
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