But is that the case for everyone else?

Everything else I have seen has pointed towards the oil heating issue.

I think it depends. High oil temps definitely result in lethargic performance across the board, but the issue also seems to be independant of oil temps. You can get the crazy lag when the engine is running at 180*, 200*, or 220*.

The oil temp association is probably a red-herring. High oil temps just correspond with high overall engine bay temps and likely occur concomitantly with heat soak. So coolish oil but a hot engine bay still causes the lag.

Someone brought up an interesting point about the NISMO, though. If there are no NISMO owners reporting any delay issues, perhaps it has something to do with the ECU/VVEL tuning.

If I were to guess, I would think it's some sort of engine control, as I've had it happen in winter or summer, with a cold engine or a heat-soaked engine, it doesn't seem to matter.

Steve is right... everything you have described are pretty much the exact same issues I've have even when ambient temps are in the 40s.

Something is getting hot and it doesn't like it. Sometimes I wonder if the VVEL actuators are getting too hot. I burned my finger touching the actuator motor. O_o

G37 owners had this issue for a long time, but I do not recall any solutions other than the Sprint Booster suggestion. IIRC, complaints started after an ECU update to remedy the VVEL actuator clicking problem.

like what?

I know my z06 never sees temps under 190*, and people have seen 310* on summer track days.

I don't think never seeing temps of 220* is normal.

Ok guys, i have this problem and I can't read through 41 pages LOL, so what's the solution? anyone?

extend your posts per page setting and itll only be 17 pages.

hehe

umm basically just down shift then accelerate and there is no delay. The only time i notice a delay is in Auto mode on my 7at. if im in manual, i downshift to hit like 4500 rpm's and im out of there.

Also, I haven't read most of this thread so yea.

The trouble is you can't downshift when you're already in 1st gear trying to get away from a light.

It's not an issue of being outside of the torque curve, it's some sort of electronic issue that cuts all throttle after an initial surge. So far we have determined it's not oil temp, ambient temp, or heat soak related. It has to be something within the ECU, perhaps related to VVEL, that is causing it.

that's weird. I have only noticed pedal delay in the higher gears.... 3 4 5

idk....

i rarely have this problem, and my temps never exceed 220 (they usually stay at 200-210). It is very difficult to diagnose this problem without the proper scan tools, which is going to require a helpful, knowledgeable dealer (is that even possible?!). There may be a correlation between the oil temps and VVEL operation, but again, nissan's scan tools are needed to read whats going on.

Give it time, Econ, you'll notice it soon. Best opportunity for this delay to happen is in stop/go traffic in the middle of August (at least that's been my experience).
NOTE: That's 2 more people without NISMOs that have joined the gas pedal delay convo. I'm geting more and more convinced. My plan is to trade up for the NISMO at a Nissan dealer. If they happen to notice the issue with the car then I'll ask them to fix it themselves under warranty.

I love a good can of worms. :stirthepot:

Let me repost the YouTube video below to show the difference in power with a "cool" and a "hot" engine. Normally this car has plenty of power to move, and it can break loose my 285 Hankooks from roll! After 15-30 minutes of driving in warm weather, I start bogging the gears like a newb as if I'm not giving enough gas to get the car moving. You can see in the video how long it takes to get the car moving in 1st and 2nd from a roll. Pitiful.

Damn, DIGItonium, that video makes me sad, dude.

Is it consistently reproducible when the car is hot? I'm barely broken in and my oil temp is around 220 pretty consistently and the car still gets up and moves nicely.

happened since I first got the car. I thought it was normal that the car lacked torque until things became noticeable in the summer.

I spoke with my dad's friend today, a licensed mechanic, and he suggested a few things: MAF and/or O2 sensors. The heat may cause inaccurate readings causing the ECU to cut power. I do remember the tech mentioning the rough feeling while accelerating in 3rd as fuel being cut. Why? He did not know. He thought the exhaust was making things lean, but I told him people with stock cars and new ones off the lot were experiencing the same problem.

Think there are inconsistent quality of our sensors?

That video is really sad. However it looks more like the car is lazy when hot like its sucking in hot air with the AC running on full blast which results in lower power. I still see the delay though.

I hope Nissan is notified of this issue and they find a way to resolve it immediately. I say convert back to using the old throttle cable.

That's right, it feels like A/C is running. Temps were in the low 70s when the videos were recorded.

Acceleration Problems. CPS, MAF Sensor? Tune Up? - Benzworld.org - Mercedes-Benz Discussion Forum
Mass Air Flow Sensor - My VW Lemon Bulletin Board
slow acceleration problem....o2 sensors? - Benzworld.org - Mercedes-Benz Discussion Forum
MAF sensor trouble & engine shudder during heavy acceleration at certain speeds [Archive] - bimmerfest - BMW Forums

So can I convince the dealer about MAF and/or O2 sensors being the possible culprits?

They are certainly the most likely cuprits for screwing up your air/fuel ratio and causing the ECU to massively pull timing. They should do a test drive with data logging to see what the car is doing.

Digi I think you are coming onto something. I didn't fully read into those threads but have they come up with a solution?

I'd like to see the results of a vented hood with accessory fans blowing air through the engine bay. I'd bet it would work wonders for the car.

Mine too! Gave myself whiplash today!

It's not oil. I had the problem at ~180F oil in winter.

I think this it he first post I've read of an AUTO feeling it.

I posted the same thing after DIGI did it (though I don't do the moving tests)

Sorry about the post bombing, guys. I also want to reiterate that I had a bad catalytic converter. They SUPPOSEDLY tested the whole exhaust system (O2 sensors, cat, and all). They said the problem was the cat. They fixed that under warranty @40k miles. Then I traded it in that week because the problem was as bad as ever. I was very hopeful off the lot, it felt amazing. But alas it came back.

did they check the maf sensors though?

Didn't ask, and I don't see it mentioned, so likely not. They probably don't consider that part of the exhaust system.

I got another suggestion from someone in regards to troubleshooting MAF problems, and based on the issues I described he also thinks it's the MAF sensors. To isolate this problem, he suggested unplugging the MAF sensors and drive the car for a day to see if there is any consistency.

I'm not exactly sure about how our cars behave with the MAF sensors disconnected. My car is still down (no headlights) so I am not able to take the car to service to get it checked.

If you still have your car, do you think you can have them check or replace the MAF sensors under warranty?

car = gone. I did try in the past. Car won't run without them. It idles TERRIBLY and dies when you hit the gas. I also ran the car with my OBD scanner plugged into my laptop, and they looked OK to me. But I'm also not really certified to tell these things =) Data looked consistent with what I'd expect though.. matched up with RPM's / speed.

no problem... thanks for your efforts! I'm nervous about these problems affecting forced induction... wouldn't want ecu to trim fuel under boost.

I'm trying to research whether heat soak on MAF sensors is a type of failure.

Yeah, that would be umm... BAD.

Argh... Opera Mobile fail after trying to post the last message.

Please excuse my ignorance. Does anyone know if the IAT is integrated to the MAF? Perhaps IAT is getting heat soaked causing inflated readings by the ECU. Has anyone attempted to use an external IAT and relocate it elsewhere?

If MAF was an issue then I would end up with rough idle and maybe get a CEL, but there isn't any and the engine idles smooth. I do notice performance is worse off the line on a warm day after being stuck at the light for awhile, which is why I lag getting through intersections and making turns. So maybe IAT is reading higher than normal, and the ECU is responding to the inaccurate readings.

[EDIT] Eh, I feel stupid.
http://www.the370z.com/engine-drivet...-location.html
http://www.the370z.com/intake-exhaus...eed-stock.html

With the turbo kit, my MAF sensors will be relocated anyhow. I'm going to ask Sam@GTM about it... For N/A owners... perhaps it's something to consider. I'd like to see if CAI owners can chime in.

I figured it was integrated. Thanks for the info. It sounds like it's probably not that, but could be. I definitely agree that the problem is really awful when sitting at an intersection for a period.

from experience in the auto repair industry, id have to be very skeptical that the iat temp would be causing this problem. but i have to say, ive never felt a car lose so much performance as it heats up. i mean, 5 minutes after starting up, the car feels like a whole 'nother beast, but after 10 minutes or so, the performance falls on its face, comparatively speaking. ive rarely had the problems you guys have had, but i can certainly attest to the performance falling as temps rise.

side note, i wonder if wiring the fans to run all the time would help lower the underhood temps. sure it isnt going to run at optimum fuel economy, but it may help a ton.

I apologize if this has already been mentioned, I haven't had a chance to read this whole thread and only started following it about a week ago but has anyone reported these issues with an oil cooler? I read that this isn't really related to oil temps but I'm wondering if an oil cooler keeps the overall engine temps low as well and helps avoid this issue?

nope, even guys with oil coolers have it.

Did lots of searching and found this site... the creator basically has this huge rant against Nissan/Infiniti lol.

Home Page

Wow. That makes me a little sad. And I bet ALL of that could be fixed by ECU programming.

Sorry but that guy is an idiot. :rolleyes:

Considering the problem occurs at any oil temp, an oil cooler shouldn't really make a difference at all.