Entreaken
Member
- Joined
- Sep 26, 2022
- Threads
- 1
- Messages
- 24
- Reaction score
- 61
- Location
- Pittsburgh, PA
- First Name
- Eric
- Vehicle(s)
- 2022 Mustang GT, 2017 Focus RS
- Thread starter
- #1
So I had my GT into the dealer yesterday for engine noise. I provided the bulleted information below to the dealer describing what I hear, when it occurs, the conditions for occurrence etc. The technician stated, "That the noise is normal and all GTs have them." When I asked what causes the noise, he specifically stated that it was "piston slap" and that "occurs with all 'high-performance' engines."
So when the dealer wrote up the ticket for the service visit, they first put, "[Tech] spoke with customer and salesman. Compared to 2 other new mustangs and it is a normal characteristic of the vehicle."
I asked them to rewrite the ticket to specifically state, "Noise described to customer as piston slap".
Ford then rewrote to state, "Lower end piston slap noise."
So this is a semantics game on my part, but "Lower end piston slap noise" is not quite the same as "Lower end piston noise described to the customer as piston slap."
Any thoughts on this?
When I look up articles discussing piston slap, they all tend to state that it is something that should be corrected by the dealer.
So when the dealer wrote up the ticket for the service visit, they first put, "[Tech] spoke with customer and salesman. Compared to 2 other new mustangs and it is a normal characteristic of the vehicle."
I asked them to rewrite the ticket to specifically state, "Noise described to customer as piston slap".
Ford then rewrote to state, "Lower end piston slap noise."
So this is a semantics game on my part, but "Lower end piston slap noise" is not quite the same as "Lower end piston noise described to the customer as piston slap."
Any thoughts on this?
When I look up articles discussing piston slap, they all tend to state that it is something that should be corrected by the dealer.
- Starting approximately 1700 rpm, there is a “rapping” sound that can heard. It sounds almost like a hammer hitting a metal plate very rapidly.
- Sound generally present around 2K rpm and when cold (i.e. not at full operating temperature), the sound can be heard up to almost 3K RPM.
- Sounds like it is coming from the passenger side of the car.
- Sound occurs when going from no throttle up to low throttle (about 1 quarter pedal movement).
- Sound also occurs when coming down off the throttle and transitioning through the low throttle to no throttle.
- I can make the sound at will, meaning if I hold “maintenance” throttle to maintain speed or adjust the throttle to a certain point, the sound can be heard.
- The noise isn’t as apparent at higher throttles, but it can still be heard.
- After the car has warmed up (that is, when at normal operating temperature) the sound it a bit more intermittent, meaning it sometimes does not seem as apparent, but other times it is present when at operating temperature in the noted rpm ranges.
- Oil appears to be at the normal level on the dipstick.
- Sound has been present when using either 87 octane or 93 octane with no apparent change in the sound.
- The “rapping” noise as described began at just over 400 miles and was not present prior to then.
- RPMs were kept relatively low (less than 5K) and was not redlined during the break-in period. (miles at drop-off were 1177.)
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