MustangNY
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Hey Guys I have a 2017 with just about 600 miles on it. Today I heard a strange noise that I never heard before. Now i know of the piston slap but this is not that. The car was fully warmed with a temp of 225 and I was driving for about 45 minutes before first hearing it. I hear it at wide open throttle from about 3500-4000 and on. After about 7000 I cant tell if it's still there because the exhaust sound and resonance is too loud but I think I can faintly still hear it.
It was a hot and humid day today about 88 degrees and I'm wondering if this sound has something to do with the temperature. Pressure and oil levels are all normal. It's a high pitched raspy metallic rattling sound. I tried revving in neutral and didnt hear the sound. Only at wide open throttle at around 3500-4000 rpm and up.
Does anyone have any suggestions as to what this sound could possibly be. This is the first time hearing this sound and I would say it is also the first time I have driven the car hard with the temperature being this hot outside and only started to hear it when the car was fully warm after driving for 45 minutes.
Any input would be much appreciated as I would prefer not having to go to the dealership as from experience I do not like and trust the way they handle and treat cars (small scratches, grease stains on interior, etc.)
UPDATE: After letting the car cool down for about an hour and a half I took it back out and I couldnt replicate the sound. Mine situation is exactly like Jossyfilms mentioned. My car is also completely stock. Can be heard with both valves open and closed. IT is definitely coming from the outside and not the interior such as the shifter because it was more noticeable with the windows down and I can hear it coming from outside the car. I am very certain is has something to do with the heat levels and when the car is extremely hot. My theory is that somewhere in the exhaust the heat is causing metal to expand and make slight contact with something else and the specific frequency/resonance at the 4k mark is causing the metal to vibrate against the contact area causing the noise. The fact that it only happens under extreme hot conditions when the oil temp is around 225 and outside temp 85-90, this is my only logical explanation.
Now the question is where specifically this might be happening. Im hoping somebody here who has been under the car and has worked with the exhaust system and knows the ins and outs of the layout and design might chime in. I wont be taking it to the dealership because I know they wont care or bother spending time looking into this as the car drives and performs normally. For most technicians it will probably be the first time even working on a gt350 and I know from experience with not only the gt350 but with other cars, the forum community is the most knowledgeable.
It was a hot and humid day today about 88 degrees and I'm wondering if this sound has something to do with the temperature. Pressure and oil levels are all normal. It's a high pitched raspy metallic rattling sound. I tried revving in neutral and didnt hear the sound. Only at wide open throttle at around 3500-4000 rpm and up.
Does anyone have any suggestions as to what this sound could possibly be. This is the first time hearing this sound and I would say it is also the first time I have driven the car hard with the temperature being this hot outside and only started to hear it when the car was fully warm after driving for 45 minutes.
Any input would be much appreciated as I would prefer not having to go to the dealership as from experience I do not like and trust the way they handle and treat cars (small scratches, grease stains on interior, etc.)
UPDATE: After letting the car cool down for about an hour and a half I took it back out and I couldnt replicate the sound. Mine situation is exactly like Jossyfilms mentioned. My car is also completely stock. Can be heard with both valves open and closed. IT is definitely coming from the outside and not the interior such as the shifter because it was more noticeable with the windows down and I can hear it coming from outside the car. I am very certain is has something to do with the heat levels and when the car is extremely hot. My theory is that somewhere in the exhaust the heat is causing metal to expand and make slight contact with something else and the specific frequency/resonance at the 4k mark is causing the metal to vibrate against the contact area causing the noise. The fact that it only happens under extreme hot conditions when the oil temp is around 225 and outside temp 85-90, this is my only logical explanation.
Now the question is where specifically this might be happening. Im hoping somebody here who has been under the car and has worked with the exhaust system and knows the ins and outs of the layout and design might chime in. I wont be taking it to the dealership because I know they wont care or bother spending time looking into this as the car drives and performs normally. For most technicians it will probably be the first time even working on a gt350 and I know from experience with not only the gt350 but with other cars, the forum community is the most knowledgeable.
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