Recently i've been hearing a strange rattling sound coming from the car when I downshift to 2nd and punch it to pass someone in traffic or for just fun. the rattling becomes quite noticable around 5-7k rpms. I tried locating the sound and noticed it was coming from underneath the car and it suprised me when i heard it because it was actually very loud. Another thing I noticed was that my car seems to backfire more (im on a stock exhaust) and there is a very heavy smell of fumes.

I dont feel any loss of power but I do think it is the CAT, can anyone confirm this is you have had similar issues?

 

You have to be more specific. If rattle means metal clinging its the heat shield.

 

I dont know how to be more specific, When I down shift to 2nd and punch it i hear a raddling sound, I hear it when in neutral too which is how I checked it today from where it is coming from. Its definately under the car and it gives off a heavy gas smell. The exhaust is also "popping" alot more than it did before.

 

Do you only hear it in 2nd gear at WOT?

 

I hear it in 1st and neutral, but 2nd is the easiest to notice, I dont hear it in 3rd because i dont pass in third so no need to go WOT, i pass in 2nd because its easier to accellerate so i hear it there the most since in first when I go WOT its only for a bit then I shift to 2nd.

 

^If you drive it hard, does the cat start glowing red like molten metal?

 

If you pet it, does it growl or purr?

If it barks, you're doing it wrong.

 

if it happens at the same rpm up or down. it is a heat shield.

beers

 

Okay i will check the heat shield this weekend, thanks

 

this it?

 

lol !!!!