I got my 2018 Q50 Silver Sport ECUTEK tuned by a local tuner that is known for his work on Nissan/Infiniti and I have been having acceleration issue.
It happens where I am driving at a constant speed, I try to accelerate (happens when both light acceleration or hard acceleration) and I press down on the accelerator pedal and absolutely nothing happens and it doesn't matter if I depress more. The RPM stay the same or decrease slightly then after a few seconds, it accelerates out of nowhere.
Talked to my tuner and he mentioned and he has not seen this before and will send my datalogs over to ECUTEK.
I got my 2018 Q50 Silver Sport ECUTEK tuned by a local tuner that is known for his work on Nissan/Infiniti and I have been having acceleration issue.
It happens where I am driving at a constant speed, I try to accelerate (happens when both light acceleration or hard acceleration) and I press down on the accelerator pedal and absolutely nothing happens and it doesn't matter if I depress more. The RPM stay the same or decrease slightly then after a few seconds, it accelerates out of nowhere.
Talked to my tuner and he mentioned and he has not seen this before and will send my datalogs over to ECUTEK.
I would check all the connection for the O2 sensors, air intakes and where all connect to the wiring....check the pins in the plugs make sure they are not bent where all the work has been done then retune.
I think I had the exact same problem as u described, it happened only once and on one of the first tuning revisions, never experienced that again after the tune was over and done.
Same issue I and others have. I have it on my untuned 2020 RS. There was a service bulletin just released for 2021 models with this issue where the ECU needs to be reflashed. Problem here is why did you get this on a 2018 and only after the tune. I'm sure as with the belt issue that the model year they claim it occurs in is underreported. I've not heard anyone before 2020 have the issue. But you just described my torture several times a week. Its an ECU issue. Tell your tuner about the service bulletin and see if that helps. Please share what you find out.
It’s the weirdest thing! It’s especially annoying on the freeway. I didn’t have this issue before the tune, so it’s very likely the root cause. But I will share what I find out.
The TSB for the belt issue didn't apply to my 2018 RS yet I had the belt issue and they replaced my pulley. It came back again a few thousand miles later so I traded her in for the 2020 RS. Now I have the issue where I depress the pedal 100% and according to my JB4 my throttle sticks at 28% for a couple of seconds then flies to 100% and my car jerks forward. So ya my 2020 had the ECU issue and its the same issue this tuned car is having for some reason. If the tune brought in any of the original code then that is where the issue lies. I'm wondering what the tuner will see when he checks the code, or whatever he sees, with this info in hand.
I don't have a heat problem when it happens on a 55 degree morning and my JB4 logged trans temp is at 100 or below. And for me it happens when I'm going moderately slow, no boost, in traffic and then i try to floor it when the road opens up. And bam, nothing happens as if my gas pedal is disconnected. Its dangerous when the throttle does kick in and I get instant boost like its a launch control situation but not when you'd want to be getting 18psi in a millisecond.
The TSB for the belt issue didn't apply to my 2018 RS yet I had the belt issue and they replaced my pulley. It came back again a few thousand miles later so I traded her in for the 2020 RS. Now I have the issue where I depress the pedal 100% and according to my JB4 my throttle sticks at 28% for a couple of seconds then flies to 100% and my car jerks forward. So ya my 2020 had the ECU issue and its the same issue this tuned car is having for some reason. If the tune brought in any of the original code then that is where the issue lies. I'm wondering what the tuner will see when he checks the code, or whatever he sees, with this info in hand.
I don't have a heat problem when it happens on a 55 degree morning and my JB4 logged trans temp is at 100 or below. And for me it happens when I'm going moderately slow, no boost, in traffic and then i try to floor it when the road opens up. And bam, nothing happens as if my gas pedal is disconnected. Its dangerous when the throttle does kick in and I get instant boost like its a launch control situation but not when you'd want to be getting 18psi in a millisecond.
The problem is minimized with the paddles. It definitely has a transmission tie-in it seems. But there is also the throttle being stuck in the mid-20% while pedal is at 100%. Turning off and back on the car helps usually but not always. And it always seems to occur after steady driving. So I experimented with paddles by never going past 5th which eliminated the problem for the few days I drove like that. Then next day back to auto and the problem returned. But she has really good days where she pulls really well and other days where she had this issue. It makes me sad. I live almost an hour from the dealer and I can't take a day off right now to go down there. But I have hope the reflash will help. I just hope they don't deny me the reflash because 2020 is not included in the service bulletin.
I will post csv and all that this weekend. I caught the issue in a log today and it was bad today. See my pedal go to 100 and throttle and fuel do nothing? This is the issue. I step on it and I wait for second. There was another time in this trip where I was at a light, turns green, pedal 100% and it was like I was driving a 1992 Geo Metro.
I can relate to your situation. I have experienced the same exact thing with my stock red sport back when it was stock. It is frustrating and Infiniti was unfortunately of no help. But tuning might be your answer
any florida rs will do this. especially when joining traffic, when you’re most vulnerable to getting t-boned. suggest wmi and ams hx. also only turn it off when unavoidable. anyway I look at it, fi anything is a poor choice during 3000+ da summers
Any update on this. I'm having a similar problem with with 2018 Q50 Silver Sport. I suspect that it may be the O2 sensor but curious to hear.
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