Bob, My '79 Spit was built in Oct 78, it might have a single air pipe
(despite the fact it has rubber bumpers). Sure sounds from your description
that the problem is there.
If this is the case, is the emissions pipe in need of replacement, or is it
something that a little JB Weld might be able to resolve? (Sounds like you've
been up this path already...)
Unfortunately, I've got the back of the car on stands right now repairing rear
wheel cylinders, so it'll be a week or so until I get a good lok at the exhaust.
Atwell
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> > Can a non-functioning emmissions air pump (belt is missing) cause a sound=
> > like an exhaust leak near the exhaust manifold/catalytic converter? =
> > (79 Spit 1500 Federal Specs)
> >
> Hi Atwell
>
> I'm guessing that your car has the air distribution manifold, rather
> than the single air pipe that early '79 models have. If you have the
> earlier arrangement (non-rubber bumper '79 car) then check the single
> air pipe where it enters the exhaust manifold just above the cat-con.
> This is where they are prone to failure (leaks).
>
> Either way there should be a check valve inline with the air pump hose.
> This prevents exhaust gas from going to the air pump in the event of the
> belt breaking (or being gone). The check valve diaphram will "rattle"
> when the pump is not driven. This sounds a little like an exhause leak.
> You can remove the rubber hose at the check valve, and stuff a little
> bit
> of an old rag in there to stop this noise.
>
> Good luck,
>
>
> --
> Bob Sykes
> '78 Spitfires
>
>
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