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Rattle when accelerating

Tiny
PREZMACH5
  • MEMBER
  • FORD EXPLORER
Greetings!

My new (used, but new for me) SUV lets out a strange throaty rattling noise when I accelerate. It kicks in around 2300 RPM's or so when I'm driving, but if I am parked and rev the engine, the noise is not present.

Could this possibly be an exhaust rattle of some sort? Strange that it does not happen when I'm parked. But if it's not exhaust, I fear this might be a transmission problem. Any input?

The vehicle:
2002 Ford Explorer
80,000 miles
4.0L engine
automatic transmission
no fluid leaks

Thanks!
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Monday, May 14th, 2007 AT 12:39 AM

2 Replies

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Only thing I can think of is flex pipe in the exhuast. Hard ecceleration get the noise?
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Monday, May 14th, 2007 AT 7:19 AM
Tiny
PREZMACH5
  • MEMBER
  • 2 POSTS
Thanks for the reply!

And yes, happens during hard acceleration. Or just normal acceleration. Seems a bit worse for harder acceleration or when the engine is under load, like when going uphil. Sounds almost like a tricking-out resonator.
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Monday, May 14th, 2007 AT 10:08 AM

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