TB removal and then some!!!

[Roadster]

So over a month ago from my last post, feeling frustrated to say the least with my IAC counts.....didn't know what I was going to do.....so we went on the Garage/Gettysburg Cruise and the Z ran just fine. Idle at times was up to 900r's and with a blip of the throttle, came back down to 650 or so....
Fast forward to today.....first I had only one bolt securing the EGR to the plenum, as the other bolt dropped into never never land.....so I replaced the missing bolt and made sure to tighten up all connections which I always do on a periodic basis. This time I noticed both PCV connections at the plenum took a few turns to tighten up. And I replaced one of the air horn bolts and made sure both were secure. I also noticed that the throttle is not sticking (before the engine is started) like it has at times since I applied the dag.
So I start the engine (first time since the cruise), fires right up and comes down to normal idle. Checking some other things as I let the engine warm up and off I go....outside temp is 48* and crisp....
Stop and go for a few miles with slight acceleration and I notice that the idle is coming back down to around 650r's each and everytime....hmmmm....so I pull over get out the Tech 1....hook it up and what do I see.....an IAC count of 14 @idle. Big change from the last post where it was 0@idle and would not go above a count of 17 when driving. So I keep driving...accelerating bringing the r's up to 6k and above a few times....and everytime I come to a stop, the IAC count is now at 14 @idle. The lowest it went at a complete stop was 12.....it would vary between 12 and 17 count when stopped. And the idle was anywhere from 636-652r's with desired idle @662 rpm's.
So I am assuming that I must have had a slight vacuum leak which is now corrected. And I can't really pinpoint exactly what it was I did to correct the situation. All I can say is....all appears to be just perfect.....for now...

[BigJohn]

I bet your missing bolt is hanging out with my 11mm socket!

[Roadster]

Yea....they're probably having a drink of oil together.....😁

Sent from my SM-G935P using ZR-1 Net Registry mobile app

[secondchance]

Don't try to figure out what you did right. Sometimes, best to just say "thank you" and move on.

[Roadster]

I agree.....and the IAC counts made my day.....

[Roadster]

Well today I decided to take the ZR-1 out to the 74......temps were ranging from 50-54*.....overall a nice day.....98% highway driving.....so the 125 mile round trip really gave the Z a good run.....as said many times before and confirmed once again today......I absolutely enjoy 6th gear on the highway....rarely if ever using 5th unless really necessary.....traveling @70mph the tach is at about 1700 rpm's....getting up to and holding 80 mph....tach is reading 1900 rpm's.....no stumble.....no lugging the engine what-so-ever even going up slight inclines....in fact no problem with acceleration in 6th as opposed to when I first purchased the car.
Also the coolant temps were holding between 194-197 degrees and rarely got above 200 degrees on the highway on this trip......and yes the outside temps are much lower than the summer temps......

And now the latest update on the idle.......just picture perfect......no matter how I came to a stop......easy.....hard.....downshifting......each and every stop the idle is right in the 650 and above range.....
Just thinking out loud......I think the throttle is "re-broken in" with the dag if that makes any sense....smooth as ever.....had a few blasts in 4th gear and as you well know....acceleration happens very quickly to say the least and you get into that zone with little effort easily......

Owning this now for over 3 1/2 years.....I am more than totally satisfied on how my LT5 runs and performs......as we all know it is so much to drive.....but the next mod will be the Hurst shifter......I know that will even make it more fun than before.......

[XfireZ51]

IAC counts are a big "tell". Its the canary in the coal mine. And having good IAC counts at idle ie 8-18 but preferably in the 12-15 range, does a lot for smoother idle and no stalling.

[Ccmano]

Originally Posted by Roadster

Well today I decided to take the ZR-1 out to the 74......temps were ranging from 50-54*.....overall a nice day.....98% highway driving.....so the 125 mile round trip really gave the Z a good run.....as said many times before and confirmed once again today......I absolutely enjoy 6th gear on the highway....rarely if ever using 5th unless really necessary.....traveling @70mph the tach is at about 1700 rpm's....getting up to and holding 80 mph....tach is reading 1900 rpm's.....no stumble.....no lugging the engine what-so-ever even going up slight inclines....in fact no problem with acceleration in 6th as opposed to when I first purchased the car.
Also the coolant temps were holding between 194-197 degrees and rarely got above 200 degrees on the highway on this trip......and yes the outside temps are much lower than the summer temps......

And now the latest update on the idle.......just picture perfect......no matter how I came to a stop......easy.....hard.....downshifting......each and every stop the idle is right in the 650 and above range.....
Just thinking out loud......I think the throttle is "re-broken in" with the dag if that makes any sense....smooth as ever.....had a few blasts in 4th gear and as you well know....acceleration happens very quickly to say the least and you get into that zone with little effort easily......

Owning this now for over 3 1/2 years.....I am more than totally satisfied on how my LT5 runs and performs......as we all know it is so much to drive.....but the next mod will be the Hurst shifter......I know that will even make it more fun than before.......

Congrats! All the hard work paid off.

The Hurst is a pain in the *** to install especially with the trans in the car. I’ve done several. Just did the current one a couple weeks ago, but that was with the trans out. Worth every frustrating minute though. After you install a short shifter, shifting a stock unit seems like rowing a boat.
H

[XfireZ51]

Originally Posted by Ccmano

Congrats! All the hard work paid off.

The Hurst is a pain in the *** to install especially with the trans in the car. I’ve done several. Just did the current one a couple weeks ago, but that was with the trans out. Worth every frustrating minute though. After you install a short shifter, shifting a stock unit seems like rowing a boat.
H

My son has driven a 350Z for over 7 years. But when I give him the keys to my ZR, he LOVES the positive, mechanical snic, snic of the Hurst on a ZF-6.

[Ccmano]

Oh and word of advice on the Hurst install. Before installing the new shifter into the gimble sand the powder coat off the two sides that engage the gimble. Every one I have done has had too tight a fit because of the powder coat. Makes the shifter somewhat sticky before it breaks if you don’t.
H