Rattling from under the hood that seems to only occur around 2000 - 2500 RPM's

Tiny
SDW1
  • MEMBER
  • 1994 NISSAN TRUCK
  • 217,175 MILES
My truck is a 1994 Nissan pickup XE (D21) 4 cyl. 2.4L engine automatic transmission currently with 217,175 miles on it. It sounds like metal rattling/vibrating together. The noise is strictly related to rpm's from what I can tell. At first I thought it occurred when the truck changed gears, however this is not the case. Noise is not present below rpm range, and I can not detect it above the range. If I accelerate very gradually I can go through the gears without the rattling until I hit 55 - 60 MPH. At this point I am at the rpm range and the rattling will start and continue until I am out of the range. Have you ever heard of anything like this? What could be the cause and approximate repair cost?
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Monday, October 31st, 2011 AT 11:48 PM

4 Replies

Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
So it doesn't do it in neutral/park?
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Tuesday, November 1st, 2011 AT 5:14 AM
Tiny
SDW1
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  • 3 POSTS
Yes it will make the rattling noise in both park and neutral provided that I get the rpm's up to the 2000 - 2500 mark. Otherwise it will not make the noise. Sounds fine in idle as well.
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Tuesday, November 1st, 2011 AT 1:25 PM
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Have you been under hood with a listening aid like auto stethescope or vacuum cleaner tube to try an isolate area of noise?
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Tuesday, November 1st, 2011 AT 8:53 PM
Tiny
SDW1
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No I have not. I will give that a try and see if I can get any closer to the source of the rattling. Thank you.
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Tuesday, November 1st, 2011 AT 9:25 PM

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