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Discussion Starter #1
So, I just picked up my brand new Q50S today and on the way home it suddenly lost power and would not accelerate past 2000 RPM. After a few seconds it came back to normal. Then it happened again. Came back again. The third time it would not come back to normal and there was an alert about a malfunction in the center screen (between the gauges). I called the dealer and started arranging service as I pulled off the freeway. Once stopped I shut the car off for a minute then restarted and all was fine. For a while. Any ideas what may be the issue? I have to wait until morning to talk to the service department. Oh, by the way, I live 115 miles away from the dealer! :(:eek:
 

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My previous car, a 2004 G35x, had a very similar problem... in city was fine, but when I was entering the highway/accelerating, it acted as if there was a rev limiter enabled.. very scary, considering I had 70 MPH traffic headed at me and this thing was sputtering at about 2000-2500 rpm!?!!!??!

It just so happens I had just picked up my car from the dealer for brake work... so a CPD cruiser "escorted" me to the next exit so I wouldn't get CREAMED by oncoming traffic, got back on and returned to the dealer. It turned out to be a brake sensor that, when it engages, DOES limit the rpms by design, to keep you from going too fast since it is detecting an issue with the braking system, so you can literally HOBBLE your way to a service center!?!?! whaaaaa...!?

Not sure what sensor it was exactly... it's been several years, but MAN!! WHAT A RUSH!!!

Never heard of that before... but it definitely did it's job... turned out the sensor had a defective connector so it thought there was an issue with the system... that THEY had JUST worked on.. no charge of course... "HE WHO TOUCHED IT LAST" came into play here!!

They were able to pull the Diagnostic Code from the car which pointed them to the sensor.

Take it in man!
 

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So, I just picked up my brand new Q50S today and on the way home it suddenly lost power and would not accelerate past 2000 RPM. After a few seconds it came back to normal. Then it happened again. Came back again. The third time it would not come back to normal and there was an alert about a malfunction in the center screen (between the gauges). I called the dealer and started arranging service as I pulled off the freeway. Once stopped I shut the car off for a minute then restarted and all was fine. For a while. Any ideas what may be the issue? I have to wait until morning to talk to the service department. Oh, by the way, I live 115 miles away from the dealer! :(:eek:
Wow! What a crappy start! Good luck with it and I hope they figure it out pronto!
 

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I had something similar happen to me twice on my Hybrid model. The first time I was driving at around 35-40 mph, then tried to accelerate, and it felt like the car was jerking a bit, almost like there was a misfire or it was bouncing off of a rev limiter (hard to explain). I came off the throttle, let it cruise for a bit, and tried again with no issues. I mentioned it to the rep at service and he said he'd never heard of anything like it before (and needless to say it couldn't be replicated). I ignored it because it seemed like a very random occurrence.

Most recently, and this just happened a couple days ago. I was cruising on a highway around 50ish, decided to switch lanes into a faster moving lane. I increased the throttle, and the same thing happened. I tried coming off and onto the throttle, and it wouldn't accelerate, but rather continued bouncing off the imaginary limiter. (I'm pretty sure I was cursed off for cutting another car off and not speeding up!). I actually pulled back over to the shoulder, cycled the car off and on again, and it seemed to be OK.

I'm planning to bring it into service soon, and will let you know if they come to any conclusions.
 

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My e36 M3 had an issue where any time I cracked 3k (gently, aggressively, warm/cold) it would drop into limp mode, which essentially felt like I'd dropped a couple cylinders. Killing the ignition and restarting the engine would fix it (might've done it a couple of times at highway speed... I miss my manual, those were the days). Turned out to be an issue with a bad O2 sensor causing it to shift into a safety map, replaced the sensor and bam, fixed.
 

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So, I just picked up my brand new Q50S today and on the way home it suddenly lost power and would not accelerate past 2000 RPM. After a few seconds it came back to normal. Then it happened again. Came back again. The third time it would not come back to normal and there was an alert about a malfunction in the center screen (between the gauges). I called the dealer and started arranging service as I pulled off the freeway. Once stopped I shut the car off for a minute then restarted and all was fine. For a while. Any ideas what may be the issue? I have to wait until morning to talk to the service department. Oh, by the way, I live 115 miles away from the dealer! :(:eek:
Modern cars (most of them anyways) need gas to run...

... now... loose harness on O2 censor or bad MAF or as simple as it might be - incorrectly closed air filter housing
 

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Discussion Starter #8
Thank you for your suggestions.

The car is not a hybrid. I met them half way between my office and their lot today and they have the car now. It did it again just before I got to the meeting point! Plus, now the third break light and the outer ring on the taillights are staying on after parking the car and locking it!

I am waiting to hear from them about it. I have requested an identical replacement, but have not heard back on that either.

Kan
 

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Discussion Starter #9
I just heard from the dealer. They are sure they figured it out. They say it is the BCS Module. They are ordering a new one from Infiniti and it comes from Memphis. Won't be in until Tuesday next week. I told them I would give them one last chance. If this isn't it, they better find me new car!
 

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I just heard from the dealer. They are sure they figured it out. They say it is the BCS Module. They are ordering a new one from Infiniti and it comes from Memphis. Won't be in until Tuesday next week. I told them I would give them one last chance. If this isn't it, they better find me new car!
BCM would not explain power loss, it is controlled by ECM

They gave you a loaner - have they?
 

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Discussion Starter #11
I wonder if that is what he meant. It was the sales manager and he had no clue of exactly what the part was. I will check in with them again today.

Yes, they gave me a loaner and I requested a Q50. They actually met me half way between the dealership and my home. I am happy with their service, just hope they figure it out for sure this time.
 

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Discussion Starter #12
Well.....they say they have it fixed! I will pick it up tomorrow and see if they are correct. He said it was some switch in one of the brakes that was fooling the computer into thinking it was locked up all the time. The fixed it but it sounds like they did not replace it so I am somewhat skeptical.
 

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That's the exact same issue I had explained earlier in this post that I had with my 04 G35x... a brake sensor that thought there was some condition going on that would cause it to cut the throttle at 2000-2500 RPM!!

They didn't replace mine either, but rather reseated the connector for this sensor... it had just had brake work performed at the dealer, so it was probably an oversight on their part while wrapping up the brake job!

The problem never came back...
 

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Discussion Starter #14
I picked up the car yesterday and it is working great. I love this car! Cannot wait to get the new wheels. Ordered some nice wheels from Getyourwheels.com for it last week! I do have to say, I do not like the feel of the run-flat tires though. The dealer had them aired up to 40 psi but the tire says right on it the max psi is 35 so I dropped them down a bit but have not driven it after yet.
 

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Hello,

My son had the same problem with the car.
The lost of power was accompanied by an high fuel consumption...

I have the feeling it might be caused by the fuel tank.
A problem with air intake of the tank cause a low flow of the fuel...

I had already noticed an air intake by opening the tank cap during stop to refuel
 

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I had something similar happen to me twice on my Hybrid model. The first time I was driving at around 35-40 mph, then tried to accelerate, and it felt like the car was jerking a bit, almost like there was a misfire or it was bouncing off of a rev limiter (hard to explain). I came off the throttle, let it cruise for a bit, and tried again with no issues. I mentioned it to the rep at service and he said he'd never heard of anything like it before (and needless to say it couldn't be replicated). I ignored it because it seemed like a very random occurrence.

Most recently, and this just happened a couple days ago. I was cruising on a highway around 50ish, decided to switch lanes into a faster moving lane. I increased the throttle, and the same thing happened. I tried coming off and onto the throttle, and it wouldn't accelerate, but rather continued bouncing off the imaginary limiter. (I'm pretty sure I was cursed off for cutting another car off and not speeding up!). I actually pulled back over to the shoulder, cycled the car off and on again, and it seemed to be OK.

I'm planning to bring it into service soon, and will let you know if they come to any conclusions.

Did you ever take your car to the dealer due to this issue?
 
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