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Old Jan 26, 2026 | 05:11 PM
  #1  
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1999 V10 Ratlle

Good evening all! I have a question that needs some input. I've got a 1999 Super Duty with 120,000 miles. This runs very well. I am it's second owner.

My problem is, I have a "Rattle" for several minutes at startup. It is definitely not from the top end. I thought it was a loose exhaust shield, but it seems loudest near the oil pan underneath.

Oil pressure is great (on the gauge). Doesn't use oil. Oil never has metal particles.

Could it be a noisy oil pump? Any thoughts?

Thanks so much!
 
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Old Jan 27, 2026 | 09:51 PM
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Check the cover that covers the access to the flex plate, just remove it and see if the noise goes away.

Denny
 
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Old Jan 28, 2026 | 10:03 AM
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Thanks!

Thanks RVpuller! I will check this out when our frozen tundra melts in Upstate SC. Seems like this truck runs too good to have a major issue.
Blessings,
Dale
 
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Old Jan 28, 2026 | 02:19 PM
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When your looking at it I would check the converter bolts and see if there are any cracks around the bolts.
Denny
 
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Old Jan 28, 2026 | 04:17 PM
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Thanks! That sounds like a good thing to check out.
Dale
 
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Old Jan 28, 2026 | 07:06 PM
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Not really a common problem....
 
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Old Jan 30, 2026 | 04:17 PM
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old v10's were good for losing exhaust manifold studs,causing exhaust leaks ,might want to take a gander at them also

 
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Old Jan 30, 2026 | 11:38 PM
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What they said ^^^^^^^

I'm curious: does the rattle change frequency or tone if you gradually run the engine up to like 1,500RPM?
 
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Old Feb 1, 2026 | 08:26 AM
  #9  
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( "Rattle" for several minutes at startup) what ever sounds like it goes away when warm which sounds more like a exhaust leak or metal expanding heaven help the op if it's sloppy timing chains ,
 
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Old Feb 6, 2026 | 01:55 PM
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Originally Posted by rvpuller
Check the cover that covers the access to the flex plate, just remove it and see if the noise goes away.

Denny
I loosened mine, slid a piece of slit vacuum hose over the lower edge and tightened it back up.

No more noise.
 
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Old Feb 7, 2026 | 08:22 AM
  #11  
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Thanks for all these suggestions. I do know the rattle does sound loudest underneath near the tranny so the loose flexplate cover may be the answer.

I am missing several exhaust manifold studs, but not hearing the "tick" that a leaking manifold usually gives.

I will be checking into this as soon as the weather warms. I really appreciate y'all's help!

Will try to post back when I've figured it out

Blessings,
Dale
 
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Old Feb 24, 2026 | 07:13 AM
  #12  
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Originally Posted by CathedralCub
What they said ^^^^^^^

I'm curious: does the rattle change frequency or tone if you gradually run the engine up to like 1,500RPM?
Actually, I haven't found it to change frequency.

I did tighten the torque converter cover and it made a big difference. I'm going to try the vacuum hose trick ASAP.

It sounds so much like a rattling heat shield, etc. definitely not from the front of the engine like a timing chain. It definitely originates underneath.

Thanks to all for your help!

Blessings,
Dale
 
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Old Feb 24, 2026 | 11:43 PM
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I'm curious how this turns out!
 
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