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Old 10-24-2020, 06:34 PM   #1
Valkyrie14
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High Idle While Coasting

Background: I bought my SS with a BBK 95mm TB on it and had continual CEL issues. Just got a LS3 stock TB and swapped it out. Went for my first drive just now.

When I throw it into neutral coasting into a stop sign the engine holds at 2,000 rpms until I come to a complete stop. Didnít do this before.

What is causing this?
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Old 10-25-2020, 03:09 AM   #2
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It may clear up with more driving. I am not sure of the idle or TPS relearn procedure on these cars. It may take several ignition and drive cycles.
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Old 10-25-2020, 06:13 AM   #3
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Mine does it too, but the minute I clutch in itíll drop to idle.
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Old 10-25-2020, 06:45 PM   #4
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Mine did that, but it ended up having a cracked spark plug.
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Old 10-25-2020, 08:39 PM   #5
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Throttle body relearn procedure may help?
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Old 10-25-2020, 10:09 PM   #6
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Quote:
Originally Posted by RobZL1 View Post
Throttle body relearn procedure may help?
I will try this in the morning.
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Old 10-26-2020, 12:09 AM   #7
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I solved it with a 4L80e swap.
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Old 10-26-2020, 09:32 AM   #8
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Check your tune for the TB area calculation. You dropped in TB size => airflow into the engine is now skewed slightly. Definitely tune related though.
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Old 10-26-2020, 11:29 AM   #9
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Mine does the exact same thing. Nick Williams 102mm. I've got RDP doing a tune on it now to address this and other things. I'll update this thread once he's finished.
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Old 10-26-2020, 11:34 AM   #10
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Sometimes that is in the tune to keep the rpms from dropping too fast and falling past idle causing a stall issue. Mine is tuned this way, when I clutch in the rpms drop to about 1400rpm for a few seconds before falling to 800rpm
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Old 10-26-2020, 09:37 PM   #11
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So this will either support the tuning answer or mean something else. When I press in the clutch the rpms go down to normal.
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Old 10-26-2020, 10:30 PM   #12
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Can a GM TB be ported to 95mm?

I could put my BBK TB back in get my GM TB ported out and then it would be equal.
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Old 10-26-2020, 11:04 PM   #13
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Quote:
Originally Posted by Valkyrie14 View Post
So this will either support the tuning answer or mean something else. When I press in the clutch the rpms go down to normal.
Then it's in the tune. There are in-gear and neutral/park rows in the airflow tables and also the spark tables. I incorrectly assumed the tune had been modified for the TB change- my bad.

And for what it's worth, if you spend enough time to get it right, you don't need to have the idle hang to prevent a stall. You can tune the throttle blade and the spark to properly catch the idle at the targeted idle speed under all conditions. That 1400 thing is not a necessity, it can be improved to drop straight down to idle rpm.
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Old 10-26-2020, 11:43 PM   #14
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Quote:
Originally Posted by RobZL1 View Post
Then it's in the tune. There are in-gear and neutral/park rows in the airflow tables and also the spark tables. I incorrectly assumed the tune had been modified for the TB change- my bad.

And for what it's worth, if you spend enough time to get it right, you don't need to have the idle hang to prevent a stall. You can tune the throttle blade and the spark to properly catch the idle at the targeted idle speed under all conditions. That 1400 thing is not a necessity, it can be improved to drop straight down to idle rpm.
That makes sense. I wonít pretend to understand the technical points of the explanation. I use a tuner, but want to learn how to use my HP tuner. I get intimidated each time because of all of the terminology I am unfamiliar with. How difficult would it be to tune for the GM TB?
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