Gas Pedal Delay

L8N8

on pg 7 of this thread a couple of posters mentioned cleaning the MAF sensor. I believe someone said they cleaned it and the problem seemed to dissipate for awhile but then returned.

IcedZ

I cleaned them, but really it didn't fix anything.

m4a1mustang

Yep, same here.

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2ndChance

I'm a new owner but also experienced few times this issue with VDC on.. and rarely when off. However not when switched into manual mode.. my car has only 4k miles!

IcedZ

Again, then you have a different or watered down problem. VDC does not affect the problem in the extreme cases like DIGI, m4a1, and myself. I dealt with the problem for almost 40k miles until I stalled out on a hill and tapped the guy behind me.

DIGItonium

Is that embarrassing or what? Stalling out like a newbie who didn't give it enough gas, right? I've stalled 1st and Reverse in front of people on a hot day. A/C running wasn't helping either. It doesn't jerk the car... just dies. It's embarassing.

The only thing I notice about VDC OFF is the slightly improved throttle response (i.e., the ECU doesn't hold back as often). The power cut does feel like VDC kicking in, and as many owners (even G37) describe that slip lights don't come up. Plus, it's not full throttle acceleration.

Once my car is back on the road I may experiment with electronics cooling spray. There are so many variables with this car that may contribute to hesitation under acceleration: MAF, CAS, O2 Sensors, etc. It doesn't make sense since our cars idle fine. I think fuel economy is fine, but I don't know if it's running rich. The roughness seems like lean condition and fuel trimming.

I did some more reading about hanging revs, and I think it's to burn off excess fuel for reduced emissions. There's not much we can do there.

I'm honestly not much of a mechanic and don't know squat about this stuff... I Google all this stuff.

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m4a1mustang

I've never stalled the car because of it that I can remember, but I have had situations where I go to near-WOT at a light and get beat by a Prius.

A while back I had my dad roll with me in our beater Buick LeSabre. We went from a 5 mph roll and he pulled nearly 3-4 cars on me before the car finally responded and reeled him in.

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6spd

i know the solution, just never slow down!

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m4a1mustang

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wilsonp

Considering the newer detailed comments, I don't think I ever experience anything like that in my 7AT. (Of course, my oil never hits 220 as far as I've seen, so my engine doesn't get too hot for some reason.)

The only lag I've had is when turning a 90 degree turn from a stop.

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GZ3

am almost 100% positive that this is a VVEL issue. Once the tuner or adjuster comes out i think this problem will be resolved. Its definatly not throttle position mapping, i think its a combo of VVEL, timming retardation, imho

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DIGItonium

One of the techs at Baker Nissan is looking into this issue especially since I'm worried about this issue creeping up with the turbos installed. He also has the link to this thread and my video. He says he never heard of anyone having this sort of issue. He says these engines run hot, which is not a surprise. As usual, he suggested an oil cooler, and I told him it didn't resolve it either for some owners.

The plan is to ship the car over there for them to get the turbos installed, but some extra time will be given in case they need to diagnose the car first before installing anything.

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Davey

But why does it happen so inconsistently? That is what stumps me. Some cars do it, some don't, and even the ones that do it don't seem to consistently do it.

L8N8

and again I have to reiterate... this doesn't seem to be happening to any of the NISMO models. I may wait to see what happens with your pre-turbo inspection, DIGI, before I move on trading mine in.

Davey

I don't think I've seen it on any 2011's either.

I forget where I read it but IIRC there was a revision to the ECU programming that no longer requires ester oil on the 2011.

I thought I also read that the ester was at first recommended because of valve noise, which could have been interpreted as knock.

If that is true, that would cause the car to pull timing and would definitely get better after an ECU reset (and come back.)