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B21F Vacuum Line Routing Q's 200 1980

posted by  Bean on  Tue Jun 29 08:59 CST 2004
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last visit: Mon Aug 30 03:53 CST 2010
[RELATED]

1980 242GT 93k miles. B21F, M46

I recently installed a new engine wiring harness on my 242GT, the only two wires that were really bad were the coolant temp sensor (yellow) and one of the alternator wires (thin red with spade connector). Happy I did it, well worth the cost. Also did a bunch of other stuff which left the engine disassembled for about a week, labelled most everything but missed one hose.

I don't know how to post pictures but I'll try to describe:

Between the Idle Speed adjustment screw housing on the Throttle Body and the Bottom inlet of the Auxiliary Air Valve there is a hose (~1/2" ID). In between this hose is a vacuum valve. Vacuum valve has four inlets/outlets on it: 2x for the 1/2" ID hose, 1x for another ~1/4" ID hose from the TB, and then a connection for a vacuum line (3.3mm).

Where does the 3.3mm vacuum line connect to? My guess is it's the 3.3mm brass nipple on the intake manifold, the one closest to front of the car.

Can anyone help? I suppose if I spent 15 minutes I could figure it out by lining up all the other connections...I'm lazy today.

Thanks!
Bean
--
'80 242GT 92k, '94 945T 123k








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    B21F Vacuum Line Routing Q's 200 1980

    uid 2796's pic
    posted by  bulletproof on  Tue Jun 29 09:43 CST 2004
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    last visit: Fri Oct 24 12:02 CST 2014
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    I believe you are right. And if I remember correctly that is the IAC valve found on air conditioned cars. My '79 had one and I believe the small vacuum line went to the manifold connection like you describe. My '80 doesn't have air conditioning and has no such device. In this case the vacuum connection on the manifold is plugged.
    --
    '80 DL 2 dr








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      B21F Vacuum Line Routing Q's 200 1980

      posted by  Bean on  Tue Jun 29 14:13 CST 2004
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      last visit: Mon Aug 30 03:53 CST 2010
      [RELATED]

      Thanks, now that I think about it, the only two 3.3mm connections that I can see are on this IAC valve and the one on the intake manifold. I don't remember removing the hose or even where I put it.

      Thanks,
      Bean

      --
      '80 242GT 92k, '94 945T 123k







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