Underhood Questions
Thread Starter
Pro
Joined: Aug 2005
Posts: 557
Likes: 489
From: Atlanta
Underhood Questions
I was poking around under the hood and trying to get motivated to clean the ground points, when I found this. Any thing seem out of the ordinary?
I pulled the folded hose out of the and found the other hose that it seems that it should connect to:
What are these hoses, and should they be connected?
I pulled the folded hose out of the and found the other hose that it seems that it should connect to:
What are these hoses, and should they be connected?
Team Owner
Joined: May 2001
Posts: 36,836
Likes: 244
From: Dear Karma, I have a list of people you missed.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
Surprising your not getting some codes. The hoses are part of the A.I.R. system (emissions control) and send fresh air to your electrically operated A.I.R. pump which in turn sends fresh air to your exhaust manifolds (through two check valves). This system is active during open loop and shuts off after your engine warms up goes into closed loop operation. Has someone else owned the car before you or have you had someone else working on it before?
Team Owner
Joined: May 2001
Posts: 36,836
Likes: 244
From: Dear Karma, I have a list of people you missed.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
Originally Posted by sowega
Do you have any idea why anyone would disconnect them?
Thread Starter
Pro
Joined: Aug 2005
Posts: 557
Likes: 489
From: Atlanta
Originally Posted by LoneStarFRC
Surprising your not getting some codes. The hoses are part of the A.I.R. system (emissions control) and send fresh air to your electrically operated A.I.R. pump which in turn sends fresh air to your exhaust manifolds (through two check valves). This system is active during open loop and shuts off after your engine warms up goes into closed loop operation. Has someone else owned the car before you or have you had someone else working on it before?
Team Owner
Joined: May 2001
Posts: 36,836
Likes: 244
From: Dear Karma, I have a list of people you missed.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
Originally Posted by sowega
My dad bought the car about a year and a half ago, and, after a too many (in his mind) issues, he wants me to buy it so he can get a C6. I don't know who's been working on it, but I gather that they weren't/aren't a corvette-specific tech. The CE light has been on all weekend, but I assumed that it was just another issue due to the bad grounds.
Have you checked for codes? Try resetting and see if this helps with your CE light issue. HTH
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Thread Starter
Pro
Joined: Aug 2005
Posts: 557
Likes: 489
From: Atlanta
I reconnected the hoses and cleared the 0410 code (AIR system). I started the car and let it run for a few minutes, and the CEL didn't come back on. I don't have any other current error codes, but I am concerned that I got "NO COMM." for the RTD, HVAC, and SCM systems.
I know that I have a grounding problem, could it be the culprit in the NO COMMs?
I know that I have a grounding problem, could it be the culprit in the NO COMMs?
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
No COMMS issues can be caused by a number of issues. What specific symptoms lead you to believe that you have a chassis ground issue?
What year car do you have?
I am a firm believer that grounds should be inspected and cleaned prior to replacing parts and modules. Just as guilty as grounds is dirty and loose battery cables and weak 12 VDC batteries.
Weak batteries and poor battery connections are common causes for U series codes and Loss of COMMS. Check the battery and battery cable connections. The battery cable bolts should be torqued to 11 ft/lbs.
Let me know how you make out.
BC
What year car do you have?
I am a firm believer that grounds should be inspected and cleaned prior to replacing parts and modules. Just as guilty as grounds is dirty and loose battery cables and weak 12 VDC batteries.
Weak batteries and poor battery connections are common causes for U series codes and Loss of COMMS. Check the battery and battery cable connections. The battery cable bolts should be torqued to 11 ft/lbs.
Let me know how you make out.
BC
Thread Starter
Pro
Joined: Aug 2005
Posts: 557
Likes: 489
From: Atlanta
Originally Posted by Bill Curlee
No COMMS issues can be caused by a number of issues. What specific symptoms lead you to believe that you have a chassis ground issue?
What year car do you have?
I am a firm believer that grounds should be inspected and cleaned prior to replacing parts and modules. Just as guilty as grounds is dirty and loose battery cables and weak 12 VDC batteries.
Weak batteries and poor battery connections are common causes for U series codes and Loss of COMMS. Check the battery and battery cable connections. The battery cable bolts should be torqued to 11 ft/lbs.
Let me know how you make out.
BC
What year car do you have?
I am a firm believer that grounds should be inspected and cleaned prior to replacing parts and modules. Just as guilty as grounds is dirty and loose battery cables and weak 12 VDC batteries.
Weak batteries and poor battery connections are common causes for U series codes and Loss of COMMS. Check the battery and battery cable connections. The battery cable bolts should be torqued to 11 ft/lbs.
Let me know how you make out.
BC
Team Owner
Joined: May 2001
Posts: 36,836
Likes: 244
From: Dear Karma, I have a list of people you missed.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
Originally Posted by sowega
It's a 97 A4 coupe. The car has several inconsistent electrical gremlins, all of which, at least according to various threads I've found on this site, can be attributed to iffy grounds. Specifically, the instrument panel lights sometimes don't work, the guages will sometimes go dead, the headlights periodically refuse to go up or down, and the turnsignals sometimes don't work or blink at odd frequencies
Thread Starter
Pro
Joined: Aug 2005
Posts: 557
Likes: 489
From: Atlanta
I haven't yet checked the HVAC drains, but they're on the list. I'm finding out that whoever owned this car before my dad didn't take great care of it. 
The good news is that, slowly but surely, all these little issues are being fixed.
The good news is that, slowly but surely, all these little issues are being fixed.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
YEP! 
Passengere side fire wall, look directly aft of the rear od the cylinder head.
If you look from the top, you can just see it. The flashlight beam is highlighting it.
It will be in a small recessed area and there will be a large wiring harness running over top of it. If you dont have headers, attack it from the bottom. If you have headers, good luck. It best reached from the top.
Here is what it looks like:
Bill
Passengere side fire wall, look directly aft of the rear od the cylinder head.If you look from the top, you can just see it. The flashlight beam is highlighting it.
It will be in a small recessed area and there will be a large wiring harness running over top of it. If you dont have headers, attack it from the bottom. If you have headers, good luck. It best reached from the top.
Here is what it looks like:
Bill