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Garage: Yes but no roof.
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Why is it loose? Is it the Vacuum line from Intake?
inbetween 2 of the intakes on the drivers' side of my Euro 928S ('84) there is a rubber hose attached to a 3" piece of metal tubing with a hose-clamp. The metal tube then sticks into the intake distributor, just in front of the intake closest to the driver.
I wonder what it is? It's loose. I can pull the tube & metal pipe fully (and easily) out of the intake. Seems strange. I looked about and ran into an S4 picture on http://members.rennlist.com/v1uhoh/underthe.htm where I saw what looks to be the equivalent (in as far as I can compare the two), and it's labelled Vacuum Line From Intake. Is this the same line I'm seeing? If so, should it be fixed in place and not so loose it slips out easily - or is this normal? thanks, Pauwl |
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10-17-2007, 01:27 PM
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Network Native
Join Date: Jan 2007
Location: SoCal
Posts: 10,349
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need picture
__________________
US 83 zinc metallic 5 spd, aka the nice car. Euro 85 black, 5 spd, the fast rough track car maybe car. SOLD Euro 84 red, AT, only car in garage in years, my parts car, soon to go last 7 years. |
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10-17-2007, 02:04 PM
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Heavy Metal Relocator
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Pauwl,
the only large vacuum line on the intake plenum is the one on the driver's side, between #7 and #8 cylinders. this vacuum line is then splits (a "Y" fitting) to the fuel distributor and the brake master cylinder. if this is the line you are saying is loose at the intake manifold (plenum), you have a big problem----and a huge vacuum leak. the steel insert is press fitted into the aluminum plenum, and will need to be resealed. if you can upload a picture of the line you are speaking of, we can give you a better diagnosis....... ----------
__________________
Absence of Evidence, is not Evidence of Absence. Bill Maher 8/4/09--- "I'll show you Obama's birth certificate, when you show me Sarah Palin's high school diploma." |
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10-17-2007, 05:37 PM
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Network Native
Join Date: Jan 2007
Location: SoCal
Posts: 10,349
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84 Euro isn't CIS, its LH.
__________________
US 83 zinc metallic 5 spd, aka the nice car. Euro 85 black, 5 spd, the fast rough track car maybe car. SOLD Euro 84 red, AT, only car in garage in years, my parts car, soon to go last 7 years. |
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10-17-2007, 07:07 PM
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Garage: Yes but no roof.
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I don't have a camera with me, will get a photo this weekend.
Have adapated a drawing to make it clear though, hope that helps. 
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10-17-2007, 09:14 PM
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Heavy Metal Relocator
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sorry for the CIS reference, but the result is the same according to diagram you've posted. whether or not the line splits after the manifold is irrelevant, the issue is with the steel insert.
the steel insert (where your red arrow is pointing) should not move in and out from the plenum chamber. it is press fit into the alloy. you can try to use silicone sealer to secure it back in place and prevent vacuum leaks at the attaching point. -------------
__________________
Absence of Evidence, is not Evidence of Absence. Bill Maher 8/4/09--- "I'll show you Obama's birth certificate, when you show me Sarah Palin's high school diploma." |
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10-18-2007, 07:50 PM
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Garage: Yes but no roof.
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Thanks all for the comments/help.
I've fixed it with silicon again. I've attached a photo of what it looked like for reference of others.  Pauwl |
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10-20-2007, 05:45 AM
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Heavy Metal Relocator
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Oh yes.....
that steel tube is press fit into the plenum chamber, but you can use either silicone sealer or epoxy to reattach it. that's a big vacuum leak you've got there---- 
__________________
Absence of Evidence, is not Evidence of Absence. Bill Maher 8/4/09--- "I'll show you Obama's birth certificate, when you show me Sarah Palin's high school diploma." |
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10-20-2007, 06:34 AM
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Garage: Yes but no roof.
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What would a vacuum leak mean from a usage/performance perspective?
The engine pulls really well, and it all seems fine.... Does this mean when I fix it up it'll be a lot better ? 
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10-21-2007, 12:03 AM
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Heavy Metal Relocator
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Pauwl----
Much better, everything that uses vacuum from your fuel pressure regulator to your heater and A/C unit to your BRAKES will work better.while you're at it, you might consider replacing all of your vacuum lines as well....if they are originals, they're probably brittle, rotting, or just plain bad......  ---russ
__________________
Absence of Evidence, is not Evidence of Absence. Bill Maher 8/4/09--- "I'll show you Obama's birth certificate, when you show me Sarah Palin's high school diploma." |
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10-21-2007, 10:54 AM
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Garage: Yes but no roof.
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Russ,
Code:
Much better, everything that uses vacuum from your fuel pressure regulator to... Anyway, Friday I'll see the goods, and get cracking. p.s. any idea how much coolant I'll need. What I got from the drivers'manual it would seem around 4 gallons! Could this be correct? Pauwl |
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10-23-2007, 02:57 AM
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Heavy Metal Relocator
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Pauwl-
yes, you could have problems with the fuel system due to bad vacuum lines. I am currently hunting a fuel problem (I think) on my Dad's 928 as well. Judging by the picture you've posted, you may need to change all of the vacuum lines, and maybe the intake boots as well. Basically, anything that's rubber that hasn't been replaced since the car was new. as for fuel pressure dropping off, where do I begin? Fuel filter, fuel pump, accumulator, fuel lines (particularly the rubber ones), warm up regulator (check the screens on the inlet side--make sure they are clean), start injector, Aux air valve (proper cold start operation)-----whew.....there's probably more that I've left out, but that will give you a good start on things. when you change the coolant, be sure to drain the block as well (there is a drain fitting for the coolant on the side of the block). yes, should be about 4 gallons or so. ------russ
__________________
Absence of Evidence, is not Evidence of Absence. Bill Maher 8/4/09--- "I'll show you Obama's birth certificate, when you show me Sarah Palin's high school diploma." |
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10-23-2007, 08:21 PM
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Beer
