Rattle or vibration noise when accelerating from dead stop

[shadowx]

So I get this noise when I push the throttle slightly either when Im in dead stop or going uphill while keeping the same rpm ( less than 5mph). Got Headers, xpipe and catback and bunch of suspension parts if it matters.

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[ice445]

Sounds like a loose heat shield to me.

 

[shadowx]

Sounds like a loose heat shield to me.

What do u think it's rubbing to?

 

[ice445]

What do u think it's rubbing to?

There are some shields in the engine bay area, it's not unheard of for a bolt or two to back out and then it just slaps the body of the car at certain RPM. Could also be your aftermarket exhaust, does it go away once the car is warmed up?

 

[shadowx]

There are some shields in the engine bay area, it's not unheard of for a bolt or two to back out and then it just slaps the body of the car at certain RPM. Could also be your aftermarket exhaust, does it go away once the car is warmed up?

It's mostly when the car is warmed when I'm backing off the driveway or after stop light.

 

[Cobra Jet]

Check the trans block spacer plate, it’s a common issue across the S550 and F150 platform:
https://www.mustang6g.com/forums/threads/engine-transmission-plate-noise-fix.115718/

Also check the emergency brake cable and attaching assembly found under the driver side trans tunnel. This has been a known source of metallic rattle as well and is hard to replicate unless in a certain RPM range. The cable is loose and raps against the trans tunnel under certain conditions OR could be touching exhaust mid pipe. How to adjust the cable and assembly:
https://www.mustang6g.com/forums/threads/how-to-adjust-your-parking-brake.25204/

if looking at both from under the car, yes visually they will look “fine”, but take a closer look to make sure both are not a source of the rattle.

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Also check the driveshaft center support bearing assembly. There is a small aluminum plate attached to the bottom of it which comes loose and rattles - see this thread:
https://www.mustang6g.com/forums/threads/identify-this-metallic-rattle-.161210/#post-3455184

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