I recently had a Magnaflow Catback Dual Exhaust installed, and when I'm at idle in gear there's a loud rattling noise coming from underneath the car. Whenever I accelerate or move just a little, or put the trans in Neutral, the sound goes away. Sometimes the sound goes away when idle, but if stopped and I turn the wheel left or right the sound is worse, then when wheels are straight again the sound goes away.
Because turning the wheels made the sound come or go randomly this led me to believe that the exhaust was hitting something but I looked underneath and nothing is touching except for the exhaust hangars which are setup correctly. Next guess was a loose heatshield over the cat or mufflers but everything is still.
Just recently a slight drone comes whenever I accelerate.
Any help you can provide is greatly appreciated and I'll try to keep this updated.
UPDATE: This morning after cold start and driving the sound was gone but after short drive the sound returned. So I stepped outside and listened and it's not a sound being produced by the exhaust, it does sound like something on the outside of the exhaust rattling against something. But nothing past the y-pipe is touching the chassis. I will take some underbody pics and attach them.
11/18/2010 - The rattle is from something vibrating against the fuel tank, but when I looked under nothing was touching, I will try to get better pictures.
NEW SYMPTOMS - There was heavy smoke coming from both exhausts after the car was shut off. Also while driving, I could hear a liquid or marble sound coming from the cat converter on the driver side when I hit small bumps. And also the right tailpipe was leaking oil-like liquid
All these symptoms became prominent after installing the catback dual exhaust
Because turning the wheels made the sound come or go randomly this led me to believe that the exhaust was hitting something but I looked underneath and nothing is touching except for the exhaust hangars which are setup correctly. Next guess was a loose heatshield over the cat or mufflers but everything is still.
Just recently a slight drone comes whenever I accelerate.
Any help you can provide is greatly appreciated and I'll try to keep this updated.
UPDATE: This morning after cold start and driving the sound was gone but after short drive the sound returned. So I stepped outside and listened and it's not a sound being produced by the exhaust, it does sound like something on the outside of the exhaust rattling against something. But nothing past the y-pipe is touching the chassis. I will take some underbody pics and attach them.
11/18/2010 - The rattle is from something vibrating against the fuel tank, but when I looked under nothing was touching, I will try to get better pictures.
NEW SYMPTOMS - There was heavy smoke coming from both exhausts after the car was shut off. Also while driving, I could hear a liquid or marble sound coming from the cat converter on the driver side when I hit small bumps. And also the right tailpipe was leaking oil-like liquid
All these symptoms became prominent after installing the catback dual exhaust