diablo25mn

iTrader: (5)

Just noticed a on-going problem with my Z that occurs, when you start-up after sitting for a while. In any gear, while barely tapping the gas pedal, it will sputter around 2,000 RPMs. The car has 8700 miles on it. I am currently using Mobil 1 0w-40 as of this oil change. Previous was Penzoil 10w-30 full synthetic. Has anyone experienced a similar problem during warm-ups?

BADASSTT

I go by what Nissan recommends 5W-30. After 10K miles I'll go with the Mobil 1 full synthetic.

Mansmind

Yes I have, and it didn't start until 14k miles or so. I've had it to the dealer once, last week...of course they could not duplicate it as it was already warmed up. I'll let you know what I find (if I find anything). FWIW, the engine is not throwing any codes, so can't figure it out that way.

John

diablo25mn

iTrader: (5)

I've had my performance mechanical do it once when we were testing it and he responded wtf was that.. lol. I'm change out the air filters this week to see if its that.. by chance.

Mansmind

likewise, I have the filters on order.. I'll let you know. Strangely enough, my car hasn't done this since I had it at the dealer...after doing it almost every time for a while. Still, it doesn't seem to run as smooth until it's warmed up good.

John

stylett9

iTrader: (9)

are you referring to like the first 5-10 minutes of driving city streets. When you excelerate the car starts to jerk and bog jerk and bog? I experiance this as well. I let my car idle for about a minute or two. Then go. I try to keep it under 2500 RPM until the motor is fully warm and oil PSI is normal but like i said, for the first 5-10 minutes of driving stop lights my car acts up.

Mansmind

yep, that's kind of it.. although warming up won't stop it. and it doesn't happen for me above 2500, it seems to be around 1800 -2000 most of the time...and at light throttle. Interestingly, if you change the throttle position it seems to go away quickly.. most of the time not to return. I almost suspect something with the TPS, except that it's limited to the "warming up" period.

stylett9

iTrader: (9)

TPS? I have a base model and i have this problem as well.

note, i had this problem before i did ANY of my mods too.

Mansmind

tps - throttle position sensor.. all models have this

diablo25mn

iTrader: (5)

I have base too.. started doing this in the summer time.. I had the exhaust since I bought it.. so i know its not that. -Thanks

itsjiggajames

iTrader: (5)

hm, no problem here.. 07 manual.. I let the car warm up for 30 seconds and thats it.. and drive off while being easy on the car. Only thing different on startup is higher rpms, so the car tends to pull itself when I release the clutch.. so I apply light throttle. And the manual transmission is a stubborn one when it comes to getting into gears smoothly when its cold. More notchy.

Pikespeak350Z

my car does that too, i never thought much of it. funny!

stylett9

iTrader: (9)

does anyone else notice that when the car starts to go into *sputter mode* the exhaust sounds different too? I realized the other day that when my Nismo sounds different...it sounds more throaty, that i know the sputtering is coming, and sure enough it does. I give my motor a quick rev to like 6k and it gets rid of the problem. So i guess this narrows it down to a mechanical issues.....

anyone else wanna chime in? I'd like to take my car to the dealer to get it fixed but i would have no idea where to tell them to start looking to solve the problem.

07JimmyZ

iTrader: (18)

It's funny, I was just about to post a thread before i saw this. I have about 9k miles and it just started happening about 1k ago. I'm not sure what it is but its really starting to **** me off, atleast I'm not the only one. I was gonna get it checked out during my next oil change. It seems to happen just like you said, I usually wait about 1 minute or so before I get going after startup. It'll happen in any gear after you let up off the gas then when light throttle is applied, it'll start acting up, then immediatly going away with a harder application. I can't stand it, I hope its an easy fix.

Specv_USMC

iTrader: (1)

check your oil and oil psi at startup, im not having this probelm, but what yall are saying can be caused by too much oil.

mike

PS- does it happen at all after its warm?

phreaktor

iTrader: (22)

Sounds like you have spark issues. Pull a plug and check it out.

stylett9

iTrader: (9)

man... the problem happens consistently after cold starts. Really starting to get annoying...

Corradoslc7

Someone should really call up their local Nissan dealer and see if there is a re-flash for the ecu to improve cold starts. You might also try switching gas stations, it may be as simple as a bad tank of gas.

BADASSTT

Dont have that problem here.But I do use Shell gas.

stylett9

iTrader: (9)

yeah i'm ganna go to the dealer this weekend. I consistently use 91 octane from chevron.