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7/26/11 5:12pm - Original Message: 'Emissions Exhaust Leak'
manget1 Lifetime Member
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Indianapolis, IN - USA

Vette(s):
Silver 1974 Convertible - L82 4 speed Low miles (was only 8,900 when I bought it in March 2006) - Now 42K miles. Original owner bought it as an investment for son's college expenses. 2008 Jetstream Blue Convertible - DAILY DRIVER!!

Joined: 9/3/2006
Posts: 2383
Most of you know that I am not a mechanical kind of person, so bear with me while I explain the problem.  I took the car out for a quick drive last night and heard a nasty noise under the hood.  Upon closer examination, I felt it was an exhaust leak and took it to my local shop this morning to validate.
 
What they've told me is (I may get some of this wrong) the tubes that go from the Air Pump to the exhaust via the exhauist manifold have a leak (the car sounds like a jalopy!).  They said this was a frequent problem with these tubes.  If they can find some tubes, they should be able to replace them easily, but often, they can't get them out of the exhaust manifold and that may mean a new exhaust manifold - yikes!
 
I trust this shop, so if something above sounds wrong, I may have described it incorrectly.  I'm worried about the prospect of replacing exhaust manifolds.  I've been seriously considering a full engine rebuild in the off season (probably early spring next year).  I need to know what my options are and what you all would recommend.  I've kept the car fairly original and would like to continue in that light, but...
 
Thanks


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7/26/11 5:31pm - Reply: 'Emissions Exhaust Leak'
ebo Lifetime Member
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Holland Patent, NY - USA

Vette(s):
#1 *1980 White, Red interior 14,000 mile #2 *1980 Red, Oyster interior 93,000 miles Resto project car, rebuilt to 383 stroker

Joined: 6/3/2008
Posts: 4395

Chrome headers and side pipes would look so narley on your car. I think the experts here will tell you that you can block off the tubes and dis- connect the air pump. I think Rich has his set up so they look like they are funtioning but fake. You can squeeze them off untill engine rebuild time.

And I bet they will be a mother to get out! did they say anything ez outs and retaping the threads?

Evil Smileebo


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7/26/11 5:37pm - Reply: 'Emissions Exhaust Leak'
The Rook Lifetime Member
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Pittsburgh, PA - USA

Vette(s):
1979 L-82, 3 spd auto, car was originally Lt. Beige currently painted Sportsman Red, Doeskin leather interior, 103,000 miles......

Joined: 12/4/2002
Posts: 600
mine were cut  off and rolled up when I bought my car....I agree with Ebo, headers and side pipes would make that vette vert even better looking.

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7/26/11 7:46pm - Reply: 'Emissions Exhaust Leak'
kwoody
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Tucson, AZ - USA

Vette(s):
1982 Black/Tan Leather Build Code C09E Bronze TTop CrossFire Fuel Injection L83 85 Fuel Pump Auto Axle 2.72 Firestone Firehawk Indy500

Joined: 7/11/2010
Posts: 415
Hi Marshall,

Pardon me.  Can we back up a bit.  Can you see where the leak is?  I would be more suspect of the donut where the header joins the exhaust pipes. I'm not sure how loud it could get if one of the tubes were open.  You should be able to see it. I think. If so, pinching it off sounds possible.  I'm not a pro so, mostly thinking out keyboard.

Keith 


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7/26/11 9:05pm - Reply: 'Emissions Exhaust Leak'
manget1 Lifetime Member
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Indianapolis, IN - USA

Vette(s):
Silver 1974 Convertible - L82 4 speed Low miles (was only 8,900 when I bought it in March 2006) - Now 42K miles. Original owner bought it as an investment for son's college expenses. 2008 Jetstream Blue Convertible - DAILY DRIVER!!

Joined: 9/3/2006
Posts: 2383
This same shop re-did the exhaust from the manifolds back just a year or two ago and everything still looks shiny and good.  The doughnut area is the first place I looked, but everything looks good and it's not quite loud enough for that.
 
Side pipes?  I don't think so, but thanks


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7/26/11 9:33pm - Reply: 'Emissions Exhaust Leak'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

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The air injection tubes can indeed rust/corrode thru where they go into the manifold, or anywhere else. They are right about getting the tubes off without damaging them....it's dang near impossible, especially if the dang things are already corroded thru. I have one of the tubes on mine that the very end had corroded off, and it would not seat properly. While I had the engine out in '99, I massaged the tube to where it would fit down in there a little farther, and so far, it has held up quite nicely.
IF you decide to eliminate the tubes, you will also have to eliminate the rest of the AIR system plumbing, or the smog pump will eventually lock up.
I believe there is at least one place that sells replacement AIR tubes. Depending on how bad yours are, you may need to also replace the manifolds, or you may not. Those tubes actually go down into the manifold, into the exhaust stream, so they get kinda funked up, and can be a real pita to get out...


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Joel Adams
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8/4/11 8:13pm - Reply: 'Emissions Exhaust Leak'
manget1 Lifetime Member
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Indianapolis, IN - USA

Vette(s):
Silver 1974 Convertible - L82 4 speed Low miles (was only 8,900 when I bought it in March 2006) - Now 42K miles. Original owner bought it as an investment for son's college expenses. 2008 Jetstream Blue Convertible - DAILY DRIVER!!

Joined: 9/3/2006
Posts: 2383
[QUOTE=Adams' Apple]I believe there is at least one place that sells replacement AIR tubes. [/QUOTE]
Do you happen to remember that place's name?
 
Better yet, any thought who GM may have sold any remaining ones to when they stopped carrying them?


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8/4/11 8:20pm - Reply: 'Emissions Exhaust Leak'
The Rook Lifetime Member
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Pittsburgh, PA - USA

Vette(s):
1979 L-82, 3 spd auto, car was originally Lt. Beige currently painted Sportsman Red, Doeskin leather interior, 103,000 miles......

Joined: 12/4/2002
Posts: 600
Try Bairs Marshall, they had lots of manifolds there awaiting a new owner......

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8/4/11 8:24pm - Reply: 'Emissions Exhaust Leak'
KDADDY79
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Dutchess County, NY - USA

Vette(s):
White '79 Corvette. It's a driver.

Joined: 8/27/2007
Posts: 2484

About a year ago I had a pesky exhaust leak that I couldn't figure out.

Turned out the studs that hold the donut between the pipes and the manifolds needed replacing. (They had been worked with in the past due to installing the true duals.)

Just food for thought as you (or they) begin to dig in to it.

Kevin 


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8/4/11 8:27pm - Reply: 'Emissions Exhaust Leak'
ebo Lifetime Member
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Holland Patent, NY - USA

Vette(s):
#1 *1980 White, Red interior 14,000 mile #2 *1980 Red, Oyster interior 93,000 miles Resto project car, rebuilt to 383 stroker

Joined: 6/3/2008
Posts: 4395

Corvette A.I.R. Exhaust Manifold Tubes for Small Block

Item #:106638

Price:
$ 203.99
< =no-display>< = value=4971 name=product> < id=related-products-field = name=related_product>

Fits: 1966-74

Like dese uns
Evil Smileebo


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8/4/11 8:35pm - Reply: 'Emissions Exhaust Leak'
The Rook Lifetime Member
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Pittsburgh, PA - USA

Vette(s):
1979 L-82, 3 spd auto, car was originally Lt. Beige currently painted Sportsman Red, Doeskin leather interior, 103,000 miles......

Joined: 12/4/2002
Posts: 600
ems nice uns.....

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8/4/11 9:37pm - Reply: 'Emissions Exhaust Leak'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19459
Gee, Albo....ya couldn't let Marshall in on WHERE you found those? What a pal!

Corvette Specialty has those, Marshall. No...not our Larry's Corvette Specialties...it's a different place.


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Joel Adams
C3VR Lifetime Member #56    
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8/4/11 9:50pm - Reply: 'Emissions Exhaust Leak'
daveo76
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Vancouver, WA - USA

Vette(s):
1976 Silver/Firethorn. L48, 4spd. Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.

Joined: 8/25/2005
Posts: 831
I'm blessed with a '76 L-48 -- No A.I.R. system right from the factory.  For some reason I guess GM got past EPA that year without that system.  I think the L-82's had it, though.  Good luck solving your problem -- do you have to pass any emissions?  If you don't want headers (like me) you could just get a pair of rams' horn manifolds without the holes and bolt 'em on.  

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1976 Silver/Firethorn.  L48, 4spd.  Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.
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8/5/11 5:32am - Reply: 'Emissions Exhaust Leak'
manget1 Lifetime Member
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Indianapolis, IN - USA

Vette(s):
Silver 1974 Convertible - L82 4 speed Low miles (was only 8,900 when I bought it in March 2006) - Now 42K miles. Original owner bought it as an investment for son's college expenses. 2008 Jetstream Blue Convertible - DAILY DRIVER!!

Joined: 9/3/2006
Posts: 2383
Thanks guys.  I will try both

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I wanted a Corvette my whole life, but I never dreamed of all the wonderful people I would meet because of it!

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target=_blank>Click for another pic!     And yet another!
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 Forums -> C3 Fuel, Emission Control, and Exhaust Systems
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