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intake manifold ??'s 200 1981

posted by  elaidlaw on  Mon Jun 16 04:38 CST 2003
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1981 245 b21 n/a (canadian model) m46 390*** km

Hi all-

This past weekend I was fiddling around with my brick (installed a new choke cable and cleaned the carb) and noticed something weird upon starting it up. There was a huge hiss -vaccuum leak- which turned out to be coming from the intake manifold. On the top of the intake manifold there is a solenoid mounted ahead (towards the cylinders) of the throttle body, and just behind this was the source of the hiss. It's a hole/open access port thingy that, according to haynes, is where the idle control screw is located IF you have a non-SU carb (I forget the model). I have a normally aspirated b21 with the SU carb on it.
So, I'm assuming there was some sort of plug in this previously unnoticed port. When I blocked the hole, the leak/hiss stopped and it ran better.
I screwed in a spare caliper mounting bolt and all appears to be well.
But what is actually supposed to be there, and how on earth did it vanish? I never went anywhere near it, and it was running fine when I turned it off to start work.

Any hints?

Thanks
-Eric





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New intake manifold ??'s [200][1981]
posted by  elaidlaw  on Mon Jun 16 04:38 CST 2003 >


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