Should I worry about this?
Thread Starter
12 Second Club
iTrader: (6)
Joined: Nov 2004
Posts: 220
Likes: 0
From: Albuquerque, NM
Should I worry about this? I was running against my friend in his '04 Z06 this pass weekend and noticed that when I got out of a run, the motor would idle real low. When I took it out of gear and let my foot off the gas, the tach would go to around 500 rpm and then bring itself back up to around 1K. It would do this about 3-5 times then be fine. My A/F (narrowband) looked fine so I am kinda stumped and don't know if this is normal. I have the fuel jetted a little rich and am only running a 100 NX shot.
Thanks
Thanks
Wet shots do this a lot because of the "imaginary" fuel puddling in the intake manifold.
If you reference a wideband you'll see an extreme rich when it should be either a 14.6 AFR or into DFCO while this is happening.
It takes a few seconds for all the fuel to clear out.
If you reference a wideband you'll see an extreme rich when it should be either a 14.6 AFR or into DFCO while this is happening.
It takes a few seconds for all the fuel to clear out.
Thread Starter
12 Second Club
iTrader: (6)
Joined: Nov 2004
Posts: 220
Likes: 0
From: Albuquerque, NM
Originally Posted by 227Hawk
Sounds like the 02's are trying to catch up. The PCM is showing Lean/Rich.
This is guessing from my end. Any tune info would help.
Hawk
This is guessing from my end. Any tune info would help.
Hawk
Thanks for all the input guys. If anyone thinks of anything else please let me know.
Staging Lane
Joined: Jul 2004
Posts: 66
Likes: 0
From: cowtown USA
Originally Posted by white2001s10
Wet shots do this a lot because of the "imaginary" fuel puddling in the intake manifold.
If you reference a wideband you'll see an extreme rich when it should be either a 14.6 AFR or into DFCO while this is happening.
It takes a few seconds for all the fuel to clear out.
If you reference a wideband you'll see an extreme rich when it should be either a 14.6 AFR or into DFCO while this is happening.
It takes a few seconds for all the fuel to clear out.
Trending Topics
Originally Posted by white2001s10
Wet shots do this a lot because of the "imaginary" fuel puddling in the intake manifold.
If you reference a wideband you'll see an extreme rich when it should be either a 14.6 AFR or into DFCO while this is happening.
It takes a few seconds for all the fuel to clear out.
If you reference a wideband you'll see an extreme rich when it should be either a 14.6 AFR or into DFCO while this is happening.
It takes a few seconds for all the fuel to clear out.
was bad enough...now we have to consider "imaginary puddling"... 
with wet. 
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Originally Posted by Macon
I thought the possibility of "real puddling" was bad enough...now we have to consider "imaginary puddling"... with wet.
was bad enough...now we have to consider "imaginary puddling"... with wet. 
Originally Posted by Robert56
Robert
my imaginary button...about that time I yelled BOOM 
to simulate an intake explosion. Knowing I was going to be doing an imaginary nitrous run with my imaginary wet system, I threw the chunks of metal and plastic in the road to simulate my ripped up manifold. The addition of simulated fire was tougher...I just pretended it was there and called 911. When the Dire Dept arrived they took there invisible hoses out and put out the fire. By that point in time we were all simply shaking our heads at the imaginary carnage. It was a bad imaginary morning. 
Originally Posted by white2001s10
You shouldn't be talking about this in public. 
The over-rich condition when closing the throttle after using a wet kit is evidence that there was significant fuel still in the intake manifold. Liquid fuel would then be quickly vaporized because of the sudden pressure drop in the manifold when the throttle closed, and find it's way into the cylinder.
It's something that's hard to prove beyond any doubt without pictures or video.
It's something that's hard to prove beyond any doubt without pictures or video.
Originally Posted by Robert56
Just listen to the exhaust back fire on a hard decel after a wet run, pop, pop and pop, extra/leftover fuel is going bye-bye. That's all the proof needed. 
Robert
Robert
I guess what's being said to your original question is that the motor takes a few seconds (at least) to realize that it's no longer seeing the extra volume of oxygen and gasoline. These systems are based on feed back from 02 sensors...run a:b air (with nitrous) /fuel for 12 seconds then idle at x:y air/fuel seems like it would take a moment to chill out.
Oh we're back on track
Then yes you're 02s and the PCM are trying to figure out you fueling needs.
This will happen whether or not the imaginary girlfriend is with you.
Hawk
Side note
Macon i think it's time for a nonsense thread.
Then yes you're 02s and the PCM are trying to figure out you fueling needs.
This will happen whether or not the imaginary girlfriend is with you.
Hawk
Side note
Macon i think it's time for a nonsense thread.