exhaust manifold air tubes

[Bob Fouts]

I've got a 85 Avanti with the 305 engine. The catalitic converter is gone replaced with dual exhausts. Now the air tubes that screw into the exhaust manifolds are leaking badly. I'd like to get rid of them but the mechanic says that will cause the check engine light to come on. Anybody have thoughts in this subject? Bob Fouts

[g2watch]

Hey Bob,

Do you have to have your car smoged every two years or so, or is you car exempt?

Ray

[Bob Fouts]

Hey Bob,

Do you have to have your car smoged every two years or so, or is you car exempt?

Ray

[Bob Fouts]

Hey Bob,

Do you have to have your car smoged every two years or so, or is you car exempt?

Ray

Hi Ray: No smog dection up her in theUP of MI. Have you any suggestions? Thanks Bob

[g2watch]

Bob,

Email me at g2watch@yahoo.com., I think I may just have your answer to your problem.

Ray

[Bob Fouts]

Hi Ray, again. I'm not the brightest light on computers, but I can't seem to respond to you on g2watch@yahoo.com. What am I doing wrong? Bob

[g2watch]

Bob,

.

That is my email, however, if you want to give me a call, I will be available after 5PM today. (California time)

Regards,

Ray

562 881 1219

[WayneC]

I've got a 85 Avanti with the 305 engine. The catalitic converter is gone replaced with dual exhausts. Now the air tubes that screw into the exhaust manifolds are leaking badly. I'd like to get rid of them but the mechanic says that will cause the check engine light to come on. Anybody have thoughts in this subject? Bob Fouts

I don't have good knowledge of the '85 Avanti, so I'm not sure which exhaust manifolds you have

(probably sheet metal Corvette or cast iron Monte Carlo, I assume the latter from your description),

but here's some thoughts:

1. Perhaps the injection tubes are still available from vendors; for example, here's

an injection pipe from a Monte Carlo, still available from Delco so far as I know:

http://tinyurl.com/ku2hm4

2. Find a set of manifolds that have solid tubes; should be standard Chevy

(or Corvette) manifolds of that era (mid 80's)

...try eBay, for example:

http://tinyurl.com/mfh3nf

http://tinyurl.com/n5abvf

http://tinyurl.com/mqlzw8

http://tinyurl.com/knsrfe

If those look like yours, or if you have cast-iron center outlet manifolds,

then perhaps these would be a direct replacement (if the air tubes have

their inlet in the correct position).

I think I have a nice set of sheet-metal injection manifolds (came off a year-old

'84 Corvette 350); I kept them for possible future use, but never did use them.

If you're interested, let me know and I'll see if I can take some pictures

and maybe we can agree on a price :>)

3. Replace the manifolds with earlier Chevy iron manifolds (or just plug the old manifolds)

and see if the check engine light does come on.

Wayne

[Bob Fouts]

Appreciate all the suggestions: What I initioally did was disconect the air pump,plug up all the air tubes, remove the several small diameter hoses, and then took it on a 100 mile test ride. everything was fine for the first 75 miles then the engine would not slow down from 2500 rpm. That was exciting and probably hard on the brakes! Removing the throttle linkage had no effect. So I reconected everything, bought a new air induction tube Car Quest # ECC 73-1830, put it all together and drove 299 miles with no problem. End of story Bob Fouts

[WayneC]

Thanks for getting back to the forum with your resolution of the problem.

I figured that, with all those older Chevies on the road, someone

had to be reproducing those tubes.