Z does not accelerate

P's_Z

While cruising at around 60mph on the highway the other day, i tried to accelarate but my Z did not seem to respond. Literally i pushed the gas pedal to the floor and was only able to go up to 65mph. I checked the oil temp thinking limp mode(although i think i couldnt make it to 60 if that was it) but temp was under 220. I stopped, turned off the car, turned the car on again, drove and everything was back to normal. After that, 3 days have passed with no issues thank God, but... Wtf?!

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Zeta

P's_Z

Also, no SES light came up, coolant temp was normal, only mods are whats on my sig and these mods have more than 2 months on the car and had neverexperienced this before. I use premium 93oct fuel from the same gas station.Not sure if any of this is relevant, but just in case.

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Zeta

P's_Z

Anyone? Searched but no conclusive answers found

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Zeta

MikeUCFL

09 370z engine sputtering while accelerating

May be related?

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Magnetic Black Touring/Sport/Navi/6MT < Stillen G3 | ZSpeed Stage 1 Clutch/Flywheel/CMAK | RJM Rev 3.2 Pedal with Tilton Master

P's_Z

Thanks for the link. At least i havent experienced the sputtering part(knock on wood), but the lack of response was definitely noticeable. I hope it was just a hiccup and not something that will happen again. Really dont feel like dealing with the stealership

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Zeta

thompsontechs

Just brainstorming here, old schools guys feel free to correct me, but that type of failure feels/sounds like maybe a sensor issue as in the car thinks you are braking hard and trying to accelerate at the same time... Like I said, just thinking out loud, does the ECU cut the gas if it reads you as on the brakes and accel at the same time??? If so, perhaps you have/had a sensor/switch checking out...

JT

MikeUCFL

Anyone know if one of those cheap elm327 OBD readers can read acceleration/brake positions? If so, you may be able to spot this using one. Otherwise, maybe cleaning out your MAF sensors with some CRC MAF cleaner could help?

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Magnetic Black Touring/Sport/Navi/6MT < Stillen G3 | ZSpeed Stage 1 Clutch/Flywheel/CMAK | RJM Rev 3.2 Pedal with Tilton Master

ZeN

Yes...obd2 elm327 with torque pro with paid Nissan Adv plugin theres brake switch parameter. It will let you know if your brake switch is on if its not. On off value only.

MikeUCFL

Ah, good to know

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Magnetic Black Touring/Sport/Navi/6MT < Stillen G3 | ZSpeed Stage 1 Clutch/Flywheel/CMAK | RJM Rev 3.2 Pedal with Tilton Master

thompsontechs

Be sure and let us kn ow when you get it figured out... nothing worse than having the same issue and not seeing an answer at the end.

juld0zer

Here's the link to my thread: HELP! Severe acceleration lag - I am just about to write up a detailed follow up so check in an hour from now.

Sounds like what i experienced twice so far and i think thompsontechs is on the right track. But several members on this forum have reported similar symptoms but different solutions. The other more common solution is replacing all camshaft position sensors and the crank angle sensor. The least satisfying solution seems to be replacing the throttle bodies (problem re-emerges shortly after, because throttle bodies were replaced as a stab in the dark solution by dealers).

P's_Z

Thanks for writing. Yes, i was actually able to accelerate when this happened, just not too much.

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Zeta

P's_Z

Thanks. Ive experienced issues with dirty MAFs before, but usually the symptom is hesitation. No harm in trying this out though, as i have some CRC MAF cleaner around. 5 days of driving after the issue happened, no problems so far

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Zeta

chii370

sounds to me the fly by wire throttle is failing in some way. they can act several different ways when they fail from not responding at all to input, to reving up and down on their own to going full bore. just my opinion.

thompsontechs

This seems possible as well, perhaps a positioning sensor failure. The more stuff you have in the design, the more there is to fail. I do not like fly by wire stuff myself... give me a good old mechanical connection. Hey. I'm old!