Rattling when I accelerate?

I start my car up and I hear a tapping sound but when I accelerate it turns into a rattling sound then when I slow down it goes back to a tapping sound.
2000 ford mustang

Valves need work.

Sounds like valves. I would take it to a mechanic as soon as you can just to find out. Stay away from pep boys or any dealers because they will over charge you. Just find a small shop you can take it to.

Loose heat shield, motor mount, noisy lifters are common causes of a rattle. Any loose bracket under the car may also cause noises. Valves, lifters would be good to look into. The noise is more annoying, than damaging, but it points to valve wear and may merit doing a valve job to quiet the sloppy movement, which causes the noise.

  • Car shaking and rattling? I have a 2000 Ford Taurus, it was driving fine until to day. The car just started shaking rattling, kinda sound ed like a lawn mower. Also seems to lose power at times and has trouble shifting gears. (It's an automatic). Of anyone can help that'd be great. Could it be the transmission it perhaps bad motor mounts?
  • Truck makes clicking/rattling noise when in 4X4? I have to use an old '97 Ford Ranger with an auto tranny and auto locking hubs at my workplace. When you turn the electronic switch to 4X4 low or high and accelerate it makes a harsh rattling/clicking noise but the truck will still move. Does this mean the transfer case is shot and I will have to live with 2 wheel drive? Since I sometimes have to drive on grass trails it would be nice to get this thing fixed if it's a simple fix.
  • Rattling noise coming from passenger side possibly engine when going up steep hills, for ranger? I ave a 2007 ford ranger and recently when going up hills there has been a rattling noise that seems to come from the passenger side towards the engine or front of the truck. What could cause this? I also recently had an oil change, and they put 5w30 in instead of the recommended 5w20, could any of this be a cause?
  • There's a rattling noise on my car when pressed on the clutch? When I press my clutch there's a rattling noise but when I take my foot off or put my hand break up it stops What could this be? Why did this happen? And how much will it cost to fix? I have a 2008 plate ford KA