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> The plenum, What's under there?
Porschef
post Sep 15 2015, 07:01 PM
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Drove the car to work today and it's running very well. When I got home I wanted to check a couple things. Don't know why I did it, but the last thing was to spray some carb cleaner around to check for vacuum leaks. When I sprayed some under the plenum, she almost stalled out. Sumbitch! I thought I'd found all the vacuum leaks.

Question is, what's under the plenum that might allow it to suck air? Could there be a crack?

Great, gives me another excuse to wrench on the car. Also should allow me to lean it out a bit more at the AFM. It's L-jet, btw.

Any ideas?
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76-914
post Sep 15 2015, 08:36 PM
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Absotootly! It's just a metal box and they do rot out. Pull it and check. Easy, peasy.
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r_towle
post Sep 15 2015, 08:41 PM
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Aliens
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rick 918-S
post Sep 15 2015, 08:48 PM
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QUOTE(r_towle @ Sep 15 2015, 09:41 PM) *

Aliens


I can reassure you there are no Aliens under there. Don't worry.
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r_towle
post Sep 15 2015, 08:49 PM
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Don't believe him, he was assimilated long ago (IMG:style_emoticons/default/assimilate.gif)
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boxsterfan
post Sep 15 2015, 09:19 PM
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QUOTE(rick 918-S @ Sep 15 2015, 07:48 PM) *

QUOTE(r_towle @ Sep 15 2015, 09:41 PM) *

Aliens


I can reassure you there are no Aliens under there. Don't worry.



This is *exactly* what an alien would say.
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McMark
post Sep 15 2015, 09:22 PM
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Yup, seen plenty of rusted out plenums.
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Porschef
post Sep 16 2015, 04:14 AM
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Thanks gents, that'll give me plenum to do this Saturday; I'll watch for both aliens and rust... (IMG:style_emoticons/default/wacko.gif)
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Porschef
post Sep 17 2015, 05:50 PM
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Looks fine. I don't know what was making it almost want to stall with carb cleaner but I'll go through everything again (IMG:style_emoticons/default/mad.gif)

At least I can clean up the compartment a bit. (IMG:style_emoticons/default/dry.gif)

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914_teener
post Sep 17 2015, 06:27 PM
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QUOTE(Porschef @ Sep 17 2015, 04:50 PM) *

Looks fine. I don't know what was making it almost want to stall with carb cleaner but I'll go through everything again (IMG:style_emoticons/default/mad.gif)

At least I can clean up the compartment a bit. (IMG:style_emoticons/default/dry.gif)

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How did you check it?
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Mike Bellis
post Sep 17 2015, 07:14 PM
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Run some green locktite across the welded seam. The green stuff is penetration grade and will seal any minor leaks in the weld.
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76-914
post Sep 17 2015, 07:19 PM
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water or air test it.
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Porschef
post Sep 18 2015, 04:17 AM
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Thanks guys. Mike, I thought about using RTV or some such but the green Loctite sounds like a great tip. (IMG:style_emoticons/default/beer.gif)
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falcor75
post Sep 18 2015, 04:23 AM
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Check the gasket between the plenum and throttle body?
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Porschef
post Sep 18 2015, 05:53 AM
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QUOTE(falcor75 @ Sep 18 2015, 06:23 AM) *

Check the gasket between the plenum and throttle body?


Yes I had and it was bad, replaced it a year or so ago. It was when I sprayed the carb cleaner under the plenum that it would almost stall.
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EdwardBlume
post Sep 18 2015, 06:37 AM
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Make sure you have your accelerator pedal stop intact and adjusted to stop the cable from over torquing the plenum.

I went through 2 plenums the hard way on my /4 AX car before figuring this out.
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Porschef
post Sep 18 2015, 10:40 AM
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Rob, had your's split at the seam underneath?
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Porschef
post Sep 18 2015, 10:42 AM
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Double post
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SirAndy
post Sep 18 2015, 12:12 PM
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Check the trough-tubes on the plenum. Almost all cracks i have seen where around those tubes and they can be somewhat hard to spot.

A pressure or water test will show ...
(IMG:style_emoticons/default/smile.gif)

EDIT: Oh, wait, this isn't a 2.0L? Nevermind then ...
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EdwardBlume
post Sep 18 2015, 01:52 PM
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Like Andy said. The plenum gets torqued by the throttle cable extended farther than the mount can go. The whole plenum contorts and lets in air. More structurally than the seams.
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