Major hesitation at idle appears drops 50 to 100 rpms like car would like to stall but never does.

 

Could be many things. Scanned for codes? I would start there.

 

I just got done speaking with a service advisor. There is a recent software update announced that fixes Hesitation in regards to ac cycling on and off. Now being I'm out of warranty, it cost $149 for the update which I feel being loyal Infiniti customers we should be given freely. I might wait til my appointment to talk to the service manager.

 

I wish you all the luck, but lately I've come to think this is a one way street.

 

What's funny I just got in touch with the operations manager at the nearest infiniti to me and their willing to pay for the software update. If the condition continues they will diagnose for no cost if I get it repaired there.

 

That sounds great, but see that they don't find some way to get you for something while you're in there.

 

There making me wait til the 4th. That's unacceptable so I'm going to another Infiniti dealership even farther away to get this done. Hope the software update fixes the issue, cross my fingers.

 

Left Infiniti dealership Software already up to date reset ECM and reprogrammed still hesitating

 

So they did the ITB11-018a reprogramming? (Or it had already been done?)

https://g35driver.com/forums/g35-sed...ow-speeds.html

 

It already have been done

 

So since having the car the idle has cleaned up a lot since the reprogramming. Still hestitating every few seconds then stops. I poured sea foam thinking it might be injector or bad gas but still rough idle. No service engine light. The next thing I could think of checking is vac lines. Good spark plugs, cleaned throttle body, no engine light for egr valve. Anything I'm not thinking of?

 

Hmm. Seems like you've got a pretty good handle on it.

I do not know them to be unreliable on these cars, so I doubt it's a factor here, but just so it's been mentioned, a bad coil unit can cause that as well, although it would normally exhibit symptoms elsewhere too.

 

I was told to let the re-programming take its course. Does that sound right?

 

I guess theoretically it could. These cars have DBW throttle, and plenty of "smart" controllers that "learn", so it's certainly worth a shot. I seem to recall quite a few folks who've done the idle relearn had reported things improving after a few days. Hopefully they aren't just feeding you a load of BS to get you out of their hair since they couldn't find it straight away though. Of course, a bad batch of gas will take a while to get out of the system as well, so what have you got to lose?

 

when was the last time u changed your battery,
clean your your tb and maf.