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Old 10-13-2018, 01:14 PM   #1  
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Default NB Weird Rattle at part throttle

New member here. I have searched, but haven't found anything on this. I have a 2002 NB that rattles in 3rd or 4th gear when cruising at part throttle in the 3-4K RPM range. Its not very loud, I can only hear it with the top and windows up. Basically if I cruise around in 4th gear and roll into the throttle between 3-4K RPM I get this rattle sound. The harder I roll into the throttle past say 20% in 4th, the louder the rattle. Light or no throttle, no rattle.

Any other time its fine, accelerating from lower gears or a stop is fine, cold start, warm start, no rattles. No CEL, car makes power like it should, runs smooth, everything seems fine driving wise. VVT actuator was replaced with a new unit from Mazda, but this sound was there prior to that, which make me think its A) Normal?? B) Something to do with the intake or C) A shield or something is loose that I haven't been able to find.

Any ideas or suggestions would be appreciated. Thanks!

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Old Yesterday, 01:30 PM   #2  
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Potential items making this noise:
-Aftermarket flywheel
-PPF Angle and resulting drive shaft angle
-Vibration damping thing on the diff coming loose and shaking around. I forgot what that thing is called.
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Old Yesterday, 04:38 PM   #3  
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Quote:
Originally Posted by EErockMiata View Post
Potential items making this noise:
-Aftermarket flywheel
-PPF Angle and resulting drive shaft angle
-Vibration damping thing on the diff coming loose and shaking around. I forgot what that thing is called.
I should mention the rattle is definitely coming from under the hood. Still on the original factory clutch and flywheel. I'll check the other two just to be sure.

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Old Yesterday, 04:40 PM   #4  
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My bet is a heatshield that rattles at the frequencies produced by the engine in that specific rpm range.
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