Anyone experience an issue with no boost until you restart the car?

[dogunbound]

About a month ago, I was driving to go and pick up a few things, and it felt like my car was driving funny. I don't go +5k turbo RPM until I've warmed up the car, but once the car was warmed up I floored it and there was no power. I looked at the boost gauge and it was failing to make any boost at all, but my turbo speed was going up. I pulled over, shut the car off, turned it back on, then started hitting normal boost numbers. The issue has never persisted.

Any idea what the cause of this was?

My theory is that some valve was stuck open, or the valve is a normally closed valve that started open and tried to "open more" when the car requested it to go open. I *think* it's the turbo re-circulation valve or something of that nature.

I don't think I can warranty it as it's not in any way shape or form reliably reproducible. Is this also something I should be concerned? I've almost forgotten about it as it's never persisted.

Lastly, anyone else ever experience missing boost in these cars too?

 

[Jah_Happy]

What mods do you have?

 

[dogunbound]

Fully stock

 

[Riggz]

I second this post. Full stock 2024 Nissan Z sport 6k miles. Maintenance up to date. Also notice on hot days (upstate NY 85°f lets say) water temp gets close to red line temps 215°f and not quite sure why but will say in “normal” dash view that it looks fine with temps being in the middle

 

[JJL]

I've had similar issues, generally warm days (25c) and sitting traffic, if I downshift to 2nd and and go WOT I only see about 0.5 bar of boost. If I back off and floor it again after 10ish seconds, I see the normal 1 bar of boost I expect. Would love to know if anyone else also experiences this. Is it just some intake air temp thing limiting boost?

 

[Z.Bush1do]

Im having issue with this too. Happened 2 times now in a month the 2nd time even i turn it off still no boost

 

[heritageownerKurosawaz400]

About a month ago, I was driving to go and pick up a few things, and it felt like my car was driving funny. I don't go +5k turbo RPM until I've warmed up the car, but once the car was warmed up I floored it and there was no power. I looked at the boost gauge and it was failing to make any boost at all, but my turbo speed was going up. I pulled over, shut the car off, turned it back on, then started hitting normal boost numbers. The issue has never persisted.

Any idea what the cause of this was?

My theory is that some valve was stuck open, or the valve is a normally closed valve that started open and tried to "open more" when the car requested it to go open. I *think* it's the turbo re-circulation valve or something of that nature.

I don't think I can warranty it as it's not in any way shape or form reliably reproducible. Is this also something I should be concerned? I've almost forgotten about it as it's never persisted.

Lastly, anyone else ever experience missing boost in these cars too?

Could be the wastegates, but if it returns to normal then it's being electronically limited most likely. I tried starting my Z and it took some time to start and turbos did not want to make boost, they spooled but no boost itself. I turned it off and started again it works. Perhaps it's a safety or "limp" mode for turbos?

 

[RobotAZ]

Seems like something a Nissan engineer should easily be able to diagnose. I’d think Nissan USA has people to address if the dealer asks.

I wouldn’t wait till it’s repeatable. I’d say it’s a safety issue having unexplained power loss and get the dealer to escalate if they have to. You could very easily have codes with no light, too.