06 Z Engine revs up when comming to a stop

[pill90]

My 06 Touring has developed a problem where if frequently revs up when coming to a stop. The revs increase to about 2000 rpm momentarily, then drop back to about 750 rpm when I'm at a complete stop. This makes driving in traffic somewhat tricky. I have the auto trans version.

My 07 Murano did the same thing a few weeks ago, it was still under warranty, the dealer said he lowered the idle speed to correct it.

My Z is newly out of warranty so I don't really want the dealer involved.The Z has 22k miles, runs premium fuel. I'm in California, but the weather has been very cold lately. Maybe temperature related? Usually in the high 30's to 50 degrees.I don't see any posts on this issue, but if has happened to my 2 Nissans it must be a somewhat frequent event. Anyone have any ideas?

[raremotive]

Sounds like an issue with idle control...

[zozoka1212]

Called rev matcing. That is normal. I think with your engine too. With the hr for sure. You drive it harder it revs up higher.

In DS mode it is more noticable.

zozo

[R350Zz33]

is it in d or +&-

[pill90]

I only use Drive. I took it out today, it didn't do it. I'm sure it's not over though.

[R350Zz33]

ur car is equipped with a rev matching downshift when it shifts to another gear it revs to match engine and transmission speed. if it does it again throw it in +and- and try using that dont forget when u go slow enough it will down shift by itself

[pill90]

Ok, I'll give it a whirl. I've had this car for a year now, It's the first that this has happened. Strange that my Murano did the same thing, it's got the CVT.

[R350Zz33]

i always drive in +and- u can use it to slow down to if ur going slow enough to go into the next lower gear it saves ur brakes

[pill90]

I've never used the + - . Guess I better get the book out and do some reading.Anyway i'll give it a shot tomorrow, it's time I learned.

[R350Zz33]

u never used it i love it i feel safer knowing that im able to pass someone and the power will be there when i gas it and i dont have to wait for the transmission to shift to a lower gear

[rmezz13]

u never used it i love it i feel safer knowing that im able to pass someone and the power will be there when i gas it and i dont have to wait for the transmission to shift to a lower gear

i would think the shift in the auto would be pretty quick? I guess when you gotta wait, you gotta wait though...

OP did you add any aftermarket products to the motor or the intake. If yes, the throttle body is extremely sensitive and your throttle positioning could need reset. If you think it could be this, then let me know and i can get you the instructions on how to do it (very easy, done from inside the cab), but its probably just the rev match, which is what it sounds like. Speaking of rev match, i want to see what thats like in the new 6mt Z because i rev match manually....

[pill90]

I tried the manual shift thing, no difference in function regarding the increased revs. I noted that the revs were staying higher even before the stop, sort of like a slow throttle response.I checked the position sensor (whatever its called) on the top of the gas peddle assembly itself. It didn't seem to be returning to the stop very quickly, when the gas peddle was worked up and down. I messed with it a bit, drove the car and no longer have the 2000 rpm stops. It's now around 850 which is still a little too high I think. it is much safer to drive now, and not nearly so annoying. When I posted this the car was 100% mod free accept some sound proofing and an ipod player addition.Tonight I added a "pop" charger. There is no change in it's operation, except maybe some intake noise, very minor at that. I'll have to put some miles on it to see if I still have a problem.

I would like to lower the revs down to about 750, if that's possible, but I think that's a dealer issue.If someone has a "how to" on reducing idle revs, that would be great.

[R350Zz33]

dosent the car idle at 750rpms how long are u stopping i dont think ive ever really stopped long enough at a stop sign for it to return to 750.

[bmike818]

Try reseting your ECU, if you haven't already done so after installing the intake system. Just unplug your battery for a couple of minutes then plug it back in, if all your radio presets are gone that means you gave it enough time. Keep us posted and good luck.

[pill90]

I don't stay long at stops either. It does not go down to 750. I will reset the ecu and report back, thanks.......

[pill90]

I reset the ecu, there is no difference. The high revs at a stop still occurs occasionally, not all the time. I'm thinking something sticking at the pedal, but I can't prove it. I'll take it the dealer. Thanks everyone who tried to help.

[R350Zz33]

spray some oil on the pivot point to the petal

[bmike818]

keep us posted. Some of us might encounter the same problem, the auto drivers that is.

[pill90]

Ok, did the lube thing. Does not help. I watched it closely while driving today. When nearing a stop the revs were down to 1000. As the car actually came to a stop the revs pick up to 2000 or so. Thats not something sticking. I'm now thinking it's something to do with the down shift to low gear. This is getting somewhat annoying. The revs stay up at 2000 while stopped at least for a few seconds. The only happens occasionally.

[tollboothwilley]

This is an idle airl volume problem. What did you do recently?

There are reset prodecures that you can do to have the TB relearn.

I recently cleaned out the TB on my G and had these symtoms. see this thread: http://forums.g35club.org/zerothread/396494

As I was downshifting the revs would jump and kind of bounce once or twice before they settled. The lowest I could get my rpms to drop at idle was ~800. When I was in the dealership getting my transmission fluid done they confirmed that I had ruined my TB when I cleaned it.

Link to 350Z reset procedures by ECU manufacturer(Technosquare)http://www.technosquareinc.com/350reset.htm

Hopefully you can do the idle air reset and be fine. Let us know.

[pill90]

Prior ton developing this problem, I haven't done anything to the car. No mods, no clean ups. My Murano was doing the same thing, maybe even worse. The dealer said he lowered the rpm at idle, it war around 850 also. Maybe the transmission shift down is getting messed up by too much idle speed. I guess it's worth a try.I will give the ECU reset thing a try, I'll have to dig up a stop watch. I'll report back in a few days.

[pill90]

Ok, I ran through the resets, actually got them to work. The revs appear to be between 700-750 at idle. My baby is stuck in the garage for a while, it's pretty ****ty weather out, I don't like driving her in the rain. I'll get a test drive soon and report back on the issue.

[R350Zz33]

haha thats funny ****ty weather mine is my dd its covered in salt and ice

[pill90]

Ok, I did the reset, got the revs down to 700 to 750 at an idle. I have not experienced the abnormal stop since doing it. Time will tell if it's fixed or not.Strangely enough I was driving my Murano in traffic this weekend, came to a quick stop at a light and the engine rev'd up to over 2000 by itself. It appears lowering the idle reduced the occurrence of the issue on the Murano, but didn't completely remove it. My wife says it does this to her also on the Murano. Of course I don't let her drive the Z.I have the Z and the Murano, both appear to be cursed with this issue. Am I really the only Nissan owner to have the problem? What are the odds?

[raremotive]

any special mods that could cause the alternator to load?

[pill90]

No mods other than an ipod added to the sound system. I see that my revs at idle are back up to 850 or so. I hope the issue doesn't reappear, it didn't do the high rev thing in traffic today, I'm just watching it to see what happens.

[PapaSmurf2k3]

I wouldn't be surprised if this had something to do with the wicked gay electronic throttle by wire crap.

I'd just keep bringing it back to the dealer... they probably have to take it back due to the lemon law after so long...

[pill90]

Thanks Papa, but i would rather not go to the dealer. It's unclear whether this is covered under the drive train warranty. I doubt the lemon law would apply, at least to the Z.It may apply for the Murano, but I don't consider it a lemon.

[PapaSmurf2k3]

ask?

[pat the farmer]

It did happen to me too a few times. Don't worry your not alone for shure. It did not happen very often to me yet but I will see if I need to correct something in the futur. Mine is a 6mt so it's not so bad since I pull the clutch and she can't go nowheres lol.