Hello all! I have been searching different forums for a few days now with no real success as of yet. A few weeks ago I purchased a 2010 g37s coupe 6mt with 57k miles and recently noticed a little issue that it has. In the lower rpm (2-3k) i'm noticing a hesitation or stumble which clears up by 4k rpm. It feels as if the ecu is pulling timing or something to that affect. I have no codes active or stored which is leaving me clueless. The only mod the car has currently is a nismo cold air intake. I have already tried cleaning the MAF sensors with nothing changing. I am a little worried about the rear timing cover gaskets that are known to fail but am under the impression i would have a CEL for low oil pressure or something of that nature. Any help would be greatly appreciated, I plan to have the dealer do an ECU update to see if that solves the problem.

 

Could it just be a dirty air filter? Maybe fuel filter or clogged cat?

 

the issue is unrelated to the leaking rear timing gasket. check your MAF, filters, and vacuum. the CAI can reduce low end torque in some cases. also, reset your ECU.

i have noticed a lack of power in lower RPMs at times, particularly in warm weather. if i step on it under 2k rpms, it takes until 3-3500 rpm for the engine to pull with much urgency. almost seems like a turbo-lag effect. part of the issue is just the power delivery of the VQ matched with the 6MT. there just isn't a bunch of grunt down low, but by 3k rpm or so things pick up.

after 6 years of ownership i've learned to live with the characteristics. i've found nothing is "wrong", it is just the nature of the car.

 

Have you changed your trans and diff fluid

 

Maf sensors have been cleaned, air filters are perfectly clean, trand and diff fluid are brand new with genuine nissan fluid (i work in parts at a nissan dealer). My invidia exhaust comes in on monday so ill check the cats when i install that. Definitely something going wrong and not just low on power in that rpm range. It has good power starting in first gear at 1k but by the time i hit 2k i can hear it bogging and actually puts me forward in the seat then clears up and runs perfect past 4k.

 

I have access to the consult iii computer at work and plan on scanning it and looking for ecm updates tomorrow night

 

Its apparently just a thing. Mine does it too...I still think it could be in need of some new plugs and wires. I have yet to come across someone that has been able to correct this issue completely

 

Have you checked all your suspension bushings and motor trans mounts

 

so it feels like VDC is on? That is the exact feeling I get if slam it into 2nd without turning off VDC

 

It does somewhat feel like the VDC kicks in but it does it with VDC on and off. as For the bushings i havnt checked them all but tough to believe they could cause that type of problem :/

 

Worn bushings can make that feeling

 

I have noticed this on my 10 6mt as well. Bought about 6 months ago. With 60k on it. Has a stillen long tube cai on it. Tried cleaning the air filters as well and no change. Mostly notice when powering out of a corner in that same rpm range. I chalked it up to the way the 3.7 makes power. Never had this issue on my 07 g35. Interested on where this thread goes. Subscribed.

 

Our engines don't make very much power below 2,500.

Once I had a similar issue and I suspect is was bad gas.
If possible, top up with a brand name 91 octane and see if there is any difference.

 

It does feel exactly like bad gas in the low rpm range. Its not just low torque. Drained the tank of gas that was in it and refueled with sunoco 93 and no difference. Gonna try to find someone to swap mafs with next.