I have 6-speed Performance Model 350z. With 6K with a Grounding Kit (from InZane).
Last weekend while the car was idle-ing I heard the car sputter but didn't pay much attention to it. Today I drove the car and I noticed that when I stop the RPMs drop to about 500 for a split second then come up to about 700 - 750. Anyone what could cause this.
thanks.

 

It could be one of your ground wires that are loose. It could be the gear you are in. I believe it has to do with the grounding wires if anything. Maybe someone else can answer you question in more detail.

 

Could have been anything. I don't think its anything to worry about, unless it does it constantly. I'll watch this thread tho, cuz I'm installing my grounding kit tomorrow morning.

Bryan

 

Cars without GKs do this too. It is called having a ton of moving parts. This isn't a computer that does the same thing every time. There is something called vaccuum that can vary depending on things as simple as AC on or off or your foot on the brake, etc. Vaccuum can easily affect the idle but it recovers. Don't worry you are driving a car...

 

I've had the GK since about 500 miles and this is the first time I noticed RPM drop. May be one of the wires came loose. Today I went to get gas. on the way to the gas station it did it once. I drove the car for a while after getting gas and it hasn't done it since. It could be that the gas cap was not tighted all the way.


If it does it again I'll check the Grounding Kit

thanks for your help I'll keep you guys posted.

 

If the gas cap was not tightened all the way that would also affect your vaccuum system. There are a ton of factors... If it doesn't do it again there is nothing wrong.

 

Your "Check Engine Light" should come on when you gas cap isn't tightened all the way.

 

your grounding wires ARE NOT LOOSE.....my car does the same before and after i had my grounding kit installed.
When coming to a stop, It goes to 700rpm then drops to 500, but sometimes the opposite happens, 500 then 700 then back to 500.

This is normal. Dont worry.