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SSM 46173 – Some 2016-2017 GT350 Mustangs Might Exhibit Piston Rattle From Idle To 3000 RPM
Some 2016-2017 Mustang GT350 equipped with the 5.2L engine may exhibit a rattle or rapping type sound during cold operation at light loads and speeds from Idle- 3000 RPM.
The noise will be most noticeable during light acceleration in the 1500-3000 RPM range and may also be noticeable in the 800-1200 RPM range with neutral throttle blips.
This sound is caused by the piston motion in the cylinder bore.
This is an inherent characteristic of the forged aluminum pistons utilized in this high performance engine.
Once the engine reaches operating temperature the noise will diminish, although it may still be noticeable even when fully warm.
There are no durability concerns with this sound.
APPLICABLE VEHICLES
2016 – 2017 CAR: ZG MUSTANG (S550)
https://static.nhtsa.gov/odi/tsbs/2016/SB-10095975-2532.pdf
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Is there any chance the rattle could improve with time? I just bought my Shelby a week ago (GT350, tech pkg). Truly amazing car, looks great, sounds great when opened up, pulls way tighter turns than my BMW, but the sound described above is what I’m also experiencing and really disheartening, a huge bummer. It sounds like something is loose, rattling at resonance like its about to come apart. It does improve after some driving, but for in my case it never goes away. Is there any hope it will reduce/go away? Is there anything I can do? Is there anything Ford could do?
I would Contact your local dealer, maybe they will help you out.