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MGB Emissions controls.

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Celtic 77

Celtic 77

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Just had my air pump seize and figured what an oppoprtunity. I remove the air pump as well as the air injectio manifold. Plugged the holes. I then removed the gulp valve. At that point I started the car and it ran rather poorly. I replace the gulp valve and it seems to run better. The 90 degree fitting into the manifold was obviously opened at the gulp valve removal. If I remove the gulp valve again and then plug that 90 deg fitting should it be ok?
 
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YakkoWarner

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Leaving an open port on the manifold is effectively a massive vacuum leak - I'm kind of surprised it ran at all. Easy way to test - stick a cork in the hole, or on smaller ones a golf tee. You can get various rubber caps at most auto parts stores, or a small length of hose with a appropriate sized bolt in the other end to act as a plug.
 
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Celtic 77

Celtic 77

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YakkoWarner said:
Leaving an open port on the manifold is effectively a massive vacuum leak - I'm kind of surprised it ran at all. Easy way to test - stick a cork in the hole, or on smaller ones a golf tee. You can get various rubber caps at most auto parts stores, or a small length of hose with a appropriate sized bolt in the other end to act as a plug.
Click to expand...
Thanks. I suppose then that I can remove the gulp valve and plug that 90 degree fitting...
 
PAUL161

PAUL161

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If you have this original hose in the system, I'd be very reluctant to throw it away! Near impossible to find as they haven't made them in years, and are needed for a concurs restoration. PJ


72ENGair hose.jpg
 
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YakkoWarner

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PAUL161 said:
If you have this original hose in the system, I'd be very reluctant to throw it away! Near impossible to find as they haven't made them in years, and are needed for a concurs restoration. PJ


View attachment 88621
Click to expand...

I agree about not discarding the removed components. To a serious show-quality restoration shop they could be quite valuable.

The parts could also be very valuable to California residents who cannot simply delete the emissions system when it fails. Your pump has gone bad, but the remaining components could still be valuable to someone needing to reconstruct the emissions systems to comply with California requirements.
 
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