2001 QX4 Electrical Idle Issue... Please Help!

[dougdude]

First I want to note I also posted this in the mechanic forum. Hope this is ok.

Hello all!Here are the details on my car:2001 QX4 4 wheel drive version49,xxx miles Kansas City, MO

Here is my issue...Around a month ago I started having an idle problem with my qx4. Normal idle is around 700 to 800 rpms. I noticed once around a month ago my car was idling pretty high... around 2000 rpms... maybe even a little higher. So, when I let off the brake, it was like I was pressing the gas a little bit. When I put the car into park, the idle would go up even a little bit more... getting close to 3,000 rpm's. I would rev the engine a little bit while in park hoping it would drop back down to a normal range.... it did not. I was in a hurry, so I just turned the car off and went on with my business for the day. When I turned the car back on later in the day, the idle was normal (700-800), but the check engine soon light was on. I took it to the Infiniti Dealer and the first time they did not find anything... they just reset the check engine light. Less than a week later, same thing happened. It started to idle really high again. While it was doing this, no lights came on, but after I turned the car off and then back on, the check engine soon light came on, but the idle was fine again. So, I took back to the dealership again and this time they found some valve that caused the light to come on. They replaced this timing valve for about 50 bucks and I was on my happy way thinking this was fixed. Well, it has been about 3 weeks and the past 2 days I have had the exact same idle issue. The only difference now is that the check engine light does not come on when I restart the car.

Here are the details in the past couple of days:I will leave work around 5pm and return home to my place about 5:15 or 5:20pm. I live in a condo so I would leave my car running in park while I went in to get my mail (2minutes max). I would return to my car, put in reverse to back up some, then put into drive. While driving I would notice I would not be stepping on the gas at all yet the car would take off as if I were stepping on it a little bit and the rpms were around 2,000. I would get it into my garage, put into park and the rpm's would shoop up a little bit more. I reved the engine some, but it would always return to the high idle. I then put it into reverse like an idiot and because of the high idle, it shifted into gear really hard... probably not so good on the ole transmission. I put it back into park, turned off, turned back on and everything was fine. This has happened the past 2 days.

Any help would be greatly appreciated. I'm afraid the dealer won't be able to find what the issue is unless they can duplicate it and we all know when you take the car to the dealer it never acts up.

Thanks all!Doug

[NISTECH]

Well doug sorry I missed your post a few days ago , dont know if you had this resolved yet. But Why dont you call your dealer ,explain to them this problem is pretty intermitten but when it does do it it wont reset till you turn the car off and restart it. then the problem is gone. So tell them what you would like to do is swing by when it happens and have a tech throw the consult II on it and take a look at the IACV readings, TPS readings and other sensors that will bump the idle. It seems kinda odd it creeps up like that but if you take it to them when it is occuring and emphasize to them not to shut the car off or the problem will go away.