Rattling noise when I full throttle?

[Darth Boss]

Hey guys. I just happened to notice a rattling sound when I gave the car full throttle while in 6th. Happened to notice it as I had the radio off. Was cruising at 60Mph or so and had something in my hand so I couldn't down shift as I had to speed up to avoid merging traffic. The rattle lasts for a few seconds right after I hit the throttle. Does it in 5th and 4th too, just not as loud. Lower gears the car is too loud to hear. I don't track her, and she has just under 5K miles.

Thought maybe loose exhaust hangers or something but it sounds like it is up front. Any thoughts?

 

[VoodooBoss]

It might be your side exhaust rattling against the floor pan. It's happened to several of us.

 

[Darth Boss]

I'll check it out. Noises are deceptive, sounds like its coming from the engine bay. What did you do to fix it?

 

[F.D. Sako]

loosen the two bolts at the flange, where the side pipe connects to the mid pipe. rotate the side pipe a bit to gain clearance. you might have to loosen the bolt at the side pipe tip as well, securing the side pipe to the chassis.

have you tried having someone rev the engine while you check under the hood?

 

[Keavdog]

Exhaust grounding out can be deceptive. The sound moves through the whole system. I swore I had a bad right front wheel bearing in my charger and it turned out to be my exhaust grounding on the diff under hard cornering.

 

[Zquez]

If it sounds like its from the engine bay or cats, it could be detonation. Bad gas maybe? What do you usually run? Noises like these are hard to diagnose definitively.

 

[TMSBOSS]

If it sounds like its from the engine bay or cats, it could be detonation. Bad gas maybe? What do you usually run? Noises like these are hard to diagnose definitively.

+1.

Sounds like you could have detonation when lugging the engine in higher gears. The computer is most likely pulling timing out making the detonation go away.

Bad/wrong gas could be the root cause.

 

[racered302]

Were you using your trackkey?

 

[Darth Boss]

I'll check the hangers.

Yes I normally run the red key.

I always run 93 octane.