Inexplicable loss of power in my 370Z

Z Ninja

I have an inexplicable loss of power issue with my 2014 370Z. I pulled out of the parking lot from work and immediately noticed I'm being limited on my power. I could shift into 2nd gear and put the accelerator all the way to the floor and not get much past 3,000 RPM. No engine warning lights or anything on the cluster. Idles fine, runs smoothly. I stopped for groceries, started the car up again, problem disappeared. I took it to the dealer and they charged for diagnostics and said they couldn't get the problem to repeat, but had a single failure of the brake switch. They replaced the brake switch, under warranty, minus $100 deductible. Apparently the theory is the brake switch limits the engine if it detects you're on the brake while trying to accelerate.

First couple of times driving it, no problems. As soon as I pulled out of the parking lot from work, same thing again! I pulled over, shut the engine down, started it back up, problem gone.

What can I look for? I've read similar articles online suggesting dirty MAF sensor, maybe engine computer has a bad grounding problem. Another suggested disconnecting the battery to reset everything.

Does anyone have more ideas? I don't want to continue to be charged diagnostic fees and have them find nothing and unable to repeat the problem.

SouthArk370Z

You can check the brake switch with a multimeter.

Cleaning the MAFs is a very easy job. More than one DIY on this site. Possibly a vid or three on Youtube.

You can buy an OBD tool that will read DTCs for as little as $30 at most auto supply stores. Or you can spend more to get data logging and other features. Most auto supply places will loan/rent OBD tools.

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UNKNOWN_370

Sounds like your car made itself believe it had to go into limp mode?

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HEK

start with the easy DIY things, MAF sensors, throttle body cleaning, a little time will save you money, then you can go to the dealer for their diagnostic, but if you got a check engine light, have Autozone check out the code for free
..

markesc

Same thing occurred with mine.

Take it back and make them clean the MAF.

DOOMMONKEY777

Change the bushing between the steering wheel and the seat.




Sure your clutch n lsd r ok?

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Quicksilvers

Could also possibly be a fuel related issue. The Nissan Sentra I had experienced similar symptoms and turned out to be a faulty fuel pump that needed to be replaced. Faulty fuel injectors I would suspect as well.

Z Ninja

I would think a problem with the MAF sensor should generate a code, but they said the only code they had was brake sensor. I'm not using an oily after market air intake, so that shouldn't be dirtying up the sensor.

I disconnected the negative battery terminal for a few minutes to reset the ECU. So far it hasn't done it again, but if it does, back to the dealer it will go.