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4L80E

Automatic Transmission - 4 Speed

1st Gear: 2.43
2nd Gear: 1.49
3rd Gear: 1.00
4th Gear: 0.75

Reverse: 2.07

- Used in production GM models...

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Re: What are the holes in plenum floor (behind TB opening) for?

Subject: Re: What are the holes in plenum floor (behind TB opening) for?
by 89Vette on 2011/2/5 22:43:39

Quote:

flyboy wrote:
Quote:

89Vette wrote:

O.K., So what comes out of the small holes in the base runner tubes? (Qualify if different on CSI vs non-CSI units).

Part of the idle air circuit. I'm glad I didn't plug them when I was porting mine. I didn't know what they were.
Small hole in lower rt. of pic. Here's a link to an interesting discussion.
http://www.ls1tech.com/forums/lt1-lt4 ... ifferent-than-oem-tb.html
I did plug the egr holes in the plenum and ground that dam away. I don't have egr.

That's what I'm talking about. If the IAC air goes thru the plenum and out those small runner holes, how does it get into/thru the TB on 89-91 plenums -- where that center triangle hole was deleted?

[IMG]http://i171.photobucket.com/albums/u309/vetteoz/Engine/plenum.jpg[/IMG]

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