Throttle lag / limp mode

datcipher

Hello all, new owner here with 2019 370z base 6mt.

Just thought I'd add to this info in case it can help somebody. I had searched for a found people with similar symptoms.....with a variety of fixes, like cleaning/replacing throttle bodies, etc......

In my case, I took ownership of this car, and found the following:

1. occasionally (maybe 1 out of 10 starts), I would start up the car, and begin with very GENTLE acceleration, only to find, it would ONLY do light acceleration. Very light....as if the peddle were stuck at 5%. This issue would resolve itself after several seconds.....the car would suddenly come to life(often about the time the doors locked), then be fine after.

2. much more rarely, (maybe 1 out of 100 times), the same thing would happen, but the car would end up stuck in that mode (maybe not QUITE as bad)......enough to drive around like....like you had a 80hp car, and you could only push the peddle 10%. This would go on until I stopped and restarted the car, at which point it would be normal - but the maintenance light would come on. As it turns out, it was throwing a Crank PositionSensor code (P0315).

I took it in after #1 occurred several times. The first time, they told me, oh it's normal to be like that. (they couldn't reproduce it) I thought: hmmm....weird...maybe the car really doesn't like to be driven that gently when first started.....

It kept recurring and then #2 happened for the first time, so i took it back. They replaced the Crank Position Sensor, but actually warned me they didn't know why it happened, and if it recurred I'd have to bring it back, but that they thought is was fixed. They said they called Nissan and even Nissan wasn't sure why this would be.

It was immediately clear it wasn't fixed as #1 kept happening - happened to me an hour later, then a week or 2 later #2 happened again. I brought it back for the 3rd visit. This time, they said they called Nissan and Nissan knew what it was. They apparently reprogrammed the ECM as instructed by Nissan.

Fortunately, it hasn't recurred since. So the problem seems resolved. Had been getting worried....a real downer buying a car, and then finding SOMETHING is wrong with it! Hope this may help somebody else in future.

CyberKnup

Sounds like you got a lemon, hopefully the fixes have permanently solved your issues.

Personally I haven't experienced limp mode in my 2019 or any issues at all tbh except occasionally on cold start, it will throw a P0156 code but it always clears up quickly and has never seemed to impact performance in a noticeable way

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2019 Heritage Edition 6MT Pearl White
Stillen Gen-3 / Motordyne ART / F.I. TDX 2.5" w/ 18" Resonators + 10" Mufflers / EcuTek / Dyno Tuned by Seb @ SpecialtyZ

datcipher

Lemon?! Well I certainly HOPE not! lol. The problem is gone the last few weeks, so I hope it stays that way.
also
I find it disturbing that you have a 2019 and have a code being thrown. That hardly seems like a good sign for a pretty new car. You'd think by 2019 they'd have these cars completely ironed out....

JARblue

Not really if you look at the way they've handled the CSC issue

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KMO-II

i normally restart the car, then turn off, restart until i get max power from accelerator, then good to go.. usual takes about 2 or 3 starts then power is back. happened to me about 6 times so far, im in a 2014 NISMO

datcipher

:-(

This really seems to have done it - hopefully it doesn't recur. I waited a while to post anything, to be sure....but #1 would happen for sure, every few days or so. I may be imagining it, but to me the car felt different the moment I drove off from my 3rd dealership visit. This despite being a bit disheartened and skeptical after the first 2 failed visits. In fact, I remember feeling optimistic after 2nd visit, where it had first thrown a code, and they replaced the sensor....i remember them saying "should drive great now!".....and then....no... same issue. This third time, it just felt....stronger and more responsive.

It's been almost 3 weeks of frequent daily driving, so I'm happy. If it happens to be the same problem.....if you get the same code, I'd recommend this....

Wish I had more info to give people. The notes say: checked and confirmed fault code P0315, send info to nissan tech line. Reprogrammed ecm as per tech line and test drove." The service guy seemed confident and said their best tech had been on it and that Nissan seemed sure they knew what the issue was. I pointed out that on the last visit, they said they called Nissan and Nissan wasn't sure.... this service guy had been on vacation, and he could only assure me that this time, they were quite confident.

INFmstrTech

There’s a couple of ways we contact Infiniti/Nissan. One way-the quick way is just a secure ‘chat’ with Techline. We don’t provide a vin, just a question with model and year. This yields good results for one time issues. The other way-this car is broke and I need help way.. is creating a Techline case with all your info, test results, data recordings, pictures, videos and supporting documentation to help resolve the incident. There’s so much that the manufacturer doesn’t tell us about changes they make To programming, parts and production.

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‘08 coupe w/Stillen SC, Custom A2A, SD, ID1050x, e85, eagle rods, high temp coated pistons, P&P heads, JWT C2, manual swap, stage 2 clutch. EcuTek(Eugene)

TacoSport10

This has happened to me several times now. I don’t notice anything until I get on the road and then just have no power. I can press the pedal all the way and it barley accelerates. I have to cut the car off, wait 10 seconds, and turn it back on. No CEL or anything ever pops up.

I’ve read the MAFS and throttle bodies may need cleaning. So I did that Saturday. Also read it could be the brake switch or the ecm. So far it hasn’t happened since, so we’ll see.

INFmstrTech

[QUOTE=TacoSport10;3967491]This has happened to me several times now. I don’t notice anything until I get on the road and then just have no power. I can press the pedal all the way and it barley accelerates. I have to cut the car off, wait 10 seconds, and turn it back on. No CEL or anything ever pops up.

I’ve read the MAFS and throttle bodies may need cleaning. So I did that Saturday. Also read it could be the brake switch or the ecm. So far it hasn’t happened since, so we’ll see.[/QUOTE

It’s the brake switch. Look at its its burned im sure. Replace both switches and make sure you properly set the brake switch 1/2 to on/off..well it’s actually switches voltage On consult for me so it’s pretty easy to watch it live.

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‘08 coupe w/Stillen SC, Custom A2A, SD, ID1050x, e85, eagle rods, high temp coated pistons, P&P heads, JWT C2, manual swap, stage 2 clutch. EcuTek(Eugene)

datcipher

Interesting....yes maybe it got escalated, and they took the deeper dive.

TacoSport10

I haven’t looked at my brake switch yet, it’s a pain to get down and then up there to inspect. But knock on wood it’s been almost a month since I’ve cleaned my MAFS and TB and I haven’t had the limp mode come back.

NissanZ34

I have experienced throttle hesitation around 2300 rpm. I do not have a PCV delete kit so the oil goes back into the intake tubes just like OEM. After a while, the oil coats the Mass air flow sensors and provoke that bogging. I get the MAF sensors cleaned with brake cleaner and it goes away.

The only real fix is to get a PCV delete kit that consists of small air filters that collect the oil. A better alternative is to get an oil catch can kit, so the oil and debris are collected and can be emptied as well, whereas the filters from the PCV delete kit get clogged and need more extensive cleaning.

John8lee

I have experienced this for a few years, it happens whenever there is a temperature swing. I stop the car, turn it off, get out and open the gas cap slightly and reset. Once i restart the car everything is back to normal. I have cleaned the MAF but no real affect. I have not tried cleaning the throttle bodes yet.

sacricide

There's a little rubber grommet under the brake light switch on the pedal, the pedal rests on it, before it depresses the switch jt. If that grommet is ripped, it will not fully engage, when accelerating and not using the brakes, and it can cause a limp mode for safety reasons related to brake lights , but without codes, or anything. to really see what the issue is. Climb under there and inspect. Takes 60 secs to verify, considering it's intermittent it's possible this is a cause

Kzonts

I have issue #1 very frequently. It’s a 2019 with 8,500 miles, so I’m thinking I might have the ECM bug you mentioned.

I have a Ecutek tune from Specialty Z. It was having the issue both before and after the tune. I thought maybe the tune would fix it, but no bueno. The car runs great otherwise.

How would I go about getting this magical ECM update with a tune?

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2019 Magnetic Black Roadster
FI Exhaust | EVO-R Rear Diffuser | Artwork Bodyshop Front Splitter | Tuned By Specialty Z