Sponsored

Overboost limp mode?

offizial

Well-Known Member
First Name
Jon
Joined
Mar 1, 2025
Threads
2
Messages
63
Reaction score
54
Location
TN USA
Car(s)
24 Nissan Z Performance
Occupation
Mechanical Engineer
Haha I was so off. I’m happy that the problem is found, and thankful that you posted. It helps everyone if this problem is encountered by another! What a simple problem, fuel + air is all you need. An afterthought to one diagnosing as this is unusual.
 
OP
OP
AugustusCaesar

AugustusCaesar

Active Member
First Name
Kyle
Joined
Apr 19, 2025
Threads
2
Messages
34
Reaction score
22
Location
Fort St John, British Columbia, Canada
Car(s)
2024 Nissan Z Sport Black
Occupation
Oilfield driver.
!UPDATE!

The fuel pump fixed the issue.
But now my clutch fluid is black. The reservoir has black/brown clutch fluid.

Had this been on my 370z I would have assumed the CSC is about to go. But the new Z doesn't have a CSC. They fixed that issue. Along with the dark fluid, I had 2 instances where the shifter didn't want to go into gear. And it grinded. First to second.
 
OP
OP
AugustusCaesar

AugustusCaesar

Active Member
First Name
Kyle
Joined
Apr 19, 2025
Threads
2
Messages
34
Reaction score
22
Location
Fort St John, British Columbia, Canada
Car(s)
2024 Nissan Z Sport Black
Occupation
Oilfield driver.
!UPDATE!

The fuel pump fixed the issue.
But now my clutch fluid is black. The reservoir has black/brown clutch fluid.

Had this been on my 370z I would have assumed the CSC is about to go. But the new Z doesn't have a CSC. They fixed that issue. Along with the dark fluid, I had 2 instances where the shifter didn't want to go into gear. And it grinded. First to second.
IT NEVER ENDS!
 

Apex_Z

Well-Known Member
First Name
Rob
Joined
Aug 28, 2025
Threads
3
Messages
111
Reaction score
188
Location
North Orlando
Car(s)
2025 Z Performance, 1950 Chevy Styleline, 1920's ratrod
Occupation
Engineer
UPDATE!

After proving it wasn't my wheels and tires. Like I told them, and obviously so. They decided to check fuel parameters during logging and found that my fuel pressure dropped to nothing, and ran lean, during those events of "limp mode" it was a failing fuel pump. Waiting for the part to get installed Friday.

Glad to know the car is smart enough to close the TB's when there's no fuel pressure.
 
 






Top