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Discussion Starter #1
Its more like a flare up to about 2500 rpm and a slow drop to normal after about a minute. I know cold start idle is a little higher but the rpm is just too high. Anyone have this issue?? I am thinking it is maybe a IAC valve issue.
 

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normal.
 

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Discussion Starter #4
Is that right?!!! I have just never seen a vehicle rev up that high from a start. Thanks for the info.
 

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its a self warming cycle. the rpms will drop after about 45 seconds. my bimmer does it too.
 

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My Pathfinder jumps up a bit more than my 2008 Frontier and my 2010 Frontier also higher than my 2008 did. I'm sure the dealer can access the rpm setting to adjust it. I sit there and expect the motor to start slower but it's just the way Nissan sets them.

Clint
 

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I'm pretty sure all newer cars do this. My wife's escape does as well.
 

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My 97 rodeo did this, v6 fuel injected, ignition coils on plug, etc... did the same thing. 01 rodeo, same setup, same thing, the current frontier I got, same setup, same thing.

Does it a lot more in the winter than summer.

Kinda gotta wait a second for it to wind down before putting er in gear.
 

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I remember the older Jeep Cherokee 4.0's would do this on every start after a nice long crank, even after being warm. I think on a few occassions they would slip into a gear or something and take off. Cant remember exactly...
 

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It does romp itself up there on a cold start. I bet the cats would do just fine if it only reved up to no more than 1800 rpms. Does the Cotex have a setting for this?
 

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a lot of engine wear is caused by lack of oil on the top end of the motor, besides emmsions requierments that it may help, it probably helps get oil distributed faster...
 

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Good question. I checked it this morning, temp 15°F. It went to 2000 RPM and then within 3 seconds went to 1800 and then within a minute was not much above normal idle, so I guess your "flare" seems rather high.
 

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yup a search revealed this thread.

same with the 2013, Rev`s to 1.7-2K when you first hit the key... a bit scary, and drives me crazy thinking it would cause more wear or breakage...

none of my past or current new vehicles rev this high upon start up...
just something I need to get used to...
 

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PR,

Personally I think that it is a Bunch of CRAP.

Maybe set up this way to wear the Engine Out Faster... :)

Earlier this Month, I took mine in and asked Manager if they could adjust the Cold Idle Speed Down. He said sure. They did an Idel Relearn,, but didn't help a bit.

The Younger Guy's don't know any better,, cause they're not used to how the motor's of yesteryear were setup on cold Idle. But I sure do.

I want to go to 10w30,, but am afraid to, because the Thinner 5w30 will flow faster on cold start up,, IMO.

I sure wish I knew how to or take it to someone that knew how to go in and change the PC setting.

About 900 rpm, would be about perfect, IMO.

Reving to 1750 and 2000 rpm's on cold idle,, is just wrong headed for long term durability,, IMO.

Joe
well to be honest, if this is the intent for Nissan and the engine actually wears out faster as a direct result, then it will be the very last Nissan we purchase.

I can see the (fake) oil pressure gauge quickly jump, and with the sensitive valving for the variable valve timing I could understand why it`s this way...
Lord knows Nissan has had issues with oiling in a lot of engines... but the 4.0 V6 is pretty stout... lets wish us all a bit of luck!::wink::
 

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The high cold idle issue can be tracked all the way back to the 4 cyl. hardbodies of the late eighties. My 87 and 89 both would idle extremely fast until they were warmed up. I never liked that.
 

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Although the 4.0 hasn't been perfect through its life cycle, many are out there with plenty of miles. This will not affect durability.
No need to lose sleep over it.
 

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Absolutely normal, and absolutely doesn't cause excessive wear. The idea is just like rebuilding a motor.. the last thing you want it to do, is lope/slug at idle (650-800) rpm while it's cold. You want it running, circulating oil, with GOOD oil pressure to REDUCE start-up wear and walking the crank due to a little more clearance when cold. I'm sure if the engine had it's way, it would idle at 1200 rpm all the time. We don't want it that high due to fuel consumption, but the engine would probably last longer with a little higher idle rpm and better oil pressure. Surely the engineers the develop engines have thought it out, and have good reasoning for a high cold-idle speed.

My .02

Just to backup what I said... here's the oil pressure values. These values are with the oil at 80*F, so both will be higher with cold oil.. but you get the idea. 3x more pressure at 2000 rpm than idle.

 
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