CammedS197
forum member
2006 mustang gt
Monday my car all of a sudden made a rattle noise coming from the front near the cats (sounded like a soda can with the tab inside rattling around). Now I could not pinpoint the exact location. But pretty sure it wasn't coming from the motor cause when under the hood it was quiet but under the car it was louder. Now when I start to drive it will go away after about a minute of driving and not come back until I turn the car off and back on then It will come back. Now Tuesday it stopped and I didn't hear it at all. I went to school and back home no rattle and car ran perfect, nothing odd. Later that same day I went to the store and idled normal seemed good then when I went to drive off it sounded different, sorta muffled, quieter, and a little deeper. Motor still running as smooth as can be, no hesitations, no CEL, and idles fine. Now under WOT I noticed the AFR was a little rich doing a 11.x-12.3 when it's always normally been a 12.5-12.7. Hunts for the 14.7 AFR when I clutch in but finds it and idles fine the whole time. I have an aftermarket x pipe with cats and borlas, detroit rocker cams, CAI, gt500 throttle, and tuned. Oh when I put my hand over the tips of the exhaust you can feel more coming out of the driver side and the exhaust is hot coming out of the driver side and I don't really feel any heat on the passenger side and also less exhaust coming out. Now I'm guessing a cat went bad and was rattling and has some of it loose in there causing it to let less exhaust by. Now I have heard I could have lost a valve or broke a spring in the valvetrain. Now that I'd here it or something with the motor. Cause it's still really smooth and power is there, can't really tell if a power loss at all. If I broke a spring motor should be running fairly rough as if on cylinder wasnt firing correct? Just the sound and AFR is all I can tell is different. I have also heard maybe VCT. Im hoping bad cat and good excuse to get the longtubes in with my offroad H lol.
Thanks in advance guys
Monday my car all of a sudden made a rattle noise coming from the front near the cats (sounded like a soda can with the tab inside rattling around). Now I could not pinpoint the exact location. But pretty sure it wasn't coming from the motor cause when under the hood it was quiet but under the car it was louder. Now when I start to drive it will go away after about a minute of driving and not come back until I turn the car off and back on then It will come back. Now Tuesday it stopped and I didn't hear it at all. I went to school and back home no rattle and car ran perfect, nothing odd. Later that same day I went to the store and idled normal seemed good then when I went to drive off it sounded different, sorta muffled, quieter, and a little deeper. Motor still running as smooth as can be, no hesitations, no CEL, and idles fine. Now under WOT I noticed the AFR was a little rich doing a 11.x-12.3 when it's always normally been a 12.5-12.7. Hunts for the 14.7 AFR when I clutch in but finds it and idles fine the whole time. I have an aftermarket x pipe with cats and borlas, detroit rocker cams, CAI, gt500 throttle, and tuned. Oh when I put my hand over the tips of the exhaust you can feel more coming out of the driver side and the exhaust is hot coming out of the driver side and I don't really feel any heat on the passenger side and also less exhaust coming out. Now I'm guessing a cat went bad and was rattling and has some of it loose in there causing it to let less exhaust by. Now I have heard I could have lost a valve or broke a spring in the valvetrain. Now that I'd here it or something with the motor. Cause it's still really smooth and power is there, can't really tell if a power loss at all. If I broke a spring motor should be running fairly rough as if on cylinder wasnt firing correct? Just the sound and AFR is all I can tell is different. I have also heard maybe VCT. Im hoping bad cat and good excuse to get the longtubes in with my offroad H lol.
Thanks in advance guys