C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Throttle body hoses?

Thread Tools
 
Search this Thread
 
Old Jun 24, 2025 | 09:10 PM
  #1  
cameron11j's Avatar
cameron11j
Thread Starter
Heel & Toe
Liked
 
Joined: Feb 2025
Posts: 15
Likes: 0
From: Kentucky
Default Throttle body hoses?

I feel they are suppose to be EVAP hoses/lines, when I follow it back, it goes under the intake and into the side of the throttle body. If I’m not mistaken they should be hooked up to the EVAP, but the EVAP already has tubing hooked up. The tubing that is connected to the throttle body is not connected to anything as you can see in the video. Very confused
Attached Files
File Type: mov
IMG_4518.mov (15.80 MB, 29 views)
Reply
Old Jun 24, 2025 | 09:50 PM
  #2  
vetteLT193's Avatar
vetteLT193
Melting Slicks
Supporting Lifetime
20 Year Member
Liked
Top Answer: 1
Top Answer: 3
 
Joined: Jul 2002
Posts: 2,223
Likes: 556
From: Tallahassee fl
Default

Originally Posted by cameron11j
I feel they are suppose to be EVAP hoses/lines, when I follow it back, it goes under the intake and into the side of the throttle body. If I’m not mistaken they should be hooked up to the EVAP, but the EVAP already has tubing hooked up. The tubing that is connected to the throttle body is not connected to anything as you can see in the video. Very confused
I can't see the video but based on description coolant lines?
Reply
Old Jun 25, 2025 | 12:31 AM
  #3  
Natty C's Avatar
Natty C
Melting Slicks
Community Builder
Community Influencer
Community Favorite
Top Answer: 1
 
Joined: May 2019
Posts: 3,238
Likes: 1,403
From: Mid-Atlantic
2025 C4 of the Year Finalist - Unmodified
2023 C4 of the Year Finalist - Unmodified
2022 C4 of the Year Finalist - Unmodified
2021 C4 of the Year - Unmodified Finalist
Default

I think the bottom hose is just a vent hose.

Top hose might go into the right side of the purge solenoid. I can't really see if there's a hose on that side of the solenoid in your video.

If it's not, than it's also a vent hose. I think there are two. Don't remember if they were a Y coming off a single line or not.


Last edited by Natty C; Jun 25, 2025 at 02:38 AM.
Reply
Old Jun 27, 2025 | 08:47 AM
  #4  
AGENT 86's Avatar
AGENT 86
Team Owner
20 Year Member
Active Streak: 30 Days
Active Streak: 60 Days
Active Streak: 90 Days
 
Joined: Jan 2003
Posts: 20,315
Likes: 245
From: Summerland B.C. Canada
Default

Originally Posted by cameron11j
I feel they are suppose to be EVAP hoses/lines, when I follow it back, it goes under the intake and into the side of the throttle body. If I’m not mistaken they should be hooked up to the EVAP, but the EVAP already has tubing hooked up. The tubing that is connected to the throttle body is not connected to anything as you can see in the video. Very confused
The loose top hose should go to purge valve, if it is the one coming from manifold vacuum.
The bottom tube is vent to atmosphere, it splits into 2 vent hoses.
The hose from throttle body should be going to passenger side valve cover.

Last edited by AGENT 86; Jun 27, 2025 at 09:01 AM.
Reply
Old Jun 27, 2025 | 09:03 AM
  #5  
AGENT 86's Avatar
AGENT 86
Team Owner
20 Year Member
Active Streak: 30 Days
Active Streak: 60 Days
Active Streak: 90 Days
 
Joined: Jan 2003
Posts: 20,315
Likes: 245
From: Summerland B.C. Canada
Default

1986 Emission


Reply

Get notified of new replies

To Throttle body hoses?





All times are GMT -4. The time now is 07:11 AM.

story-0
10 Ugly Corvettes That We Still Kinda Love

Slideshow: 10 ugly Corvettes that we still kinda love.

By Joe Kucinski | 2026-06-03 10:34:17


VIEW MORE
story-1
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

A lot of money has changed hands at the online auction house over the years.

By Brett Foote | 2026-06-03 10:21:50


VIEW MORE
story-2
10 Things Every Corvette Owner Needs (2026 Edition)

Slideshow: 10 great gifts Corvette enthusiasts actually want for Father's Day!

By Michael S. Palmer | 2026-06-03 15:43:40


VIEW MORE
story-3
8 Most "Only Corvette Owners Understand" Quirks and Problems

Slideshow: These are the quirks, annoyances, and oddly lovable problems that every Corvette owner eventually learns to live with.

By Pouria Savadkouei | 2026-05-28 09:31:39


VIEW MORE
story-4
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

Slideshow: 10 reasons why the C6 Z06 is still a performance benchmark after 20 years.

By Joe Kucinski | 2026-05-27 17:20:09


VIEW MORE
story-5
How Much Horsepower Every Corvette Engine "LOST" in 1972

Slideshow: How much horsepower every Corvette engine lost in 1972.

By Joe Kucinski | 2026-05-27 16:54:53


VIEW MORE
story-6
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Slideshow: How to Protect A Convertible Top: 10 DOs & DON'Ts

By Michael S. Palmer | 2026-04-03 00:00:00


VIEW MORE
story-7
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

Slideshow: The 10 most explosive Corvettes ever built based on power-to-weight ratio.

By Joe Kucinski | 2026-05-20 07:23:03


VIEW MORE
story-8
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-9
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE