Vacuum fitting part # help?
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Vacuum fitting part # help?
In my 84 633, there a fitting on the underside of the intake manifold that connected to a hollow plastic tube. The fitting is a small diameter hose with cloth outside re-enforcement. There’s a tiny metal clamp holding the short section of hose onto the manifold and the the hollow plastic tube (whiteish color) slips into the hose section.
Does anyone know the description or part number for that hose and clamp?
Mine is disentigrating and I am sure it’s not holding the vacuum correctly as it doesn’t fit around the plastic tube so well. Maybe this is part of my rough idling issue?
Thanks in advance for any help.
Does anyone know the description or part number for that hose and clamp?
Mine is disentigrating and I am sure it’s not holding the vacuum correctly as it doesn’t fit around the plastic tube so well. Maybe this is part of my rough idling issue?
Thanks in advance for any help.
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Song Huang
1984 633CSi
Last 7 of VIN: 6997383
Song Huang
1984 633CSi
Last 7 of VIN: 6997383
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Picture worth a Thousand words
OK, no reply possibly because no one can tell what I am talking about from my prose? Here are some pictures to help.
Here's what you see from above. The plastic vacuum tube is clearly in view and you can see where it goes into the hose in question. From below you can see the hose connection to the manifold where it is secured by an Oetiker clamp. Does this help to generate any ideas? Thanks for any guidance.
Here's what you see from above. The plastic vacuum tube is clearly in view and you can see where it goes into the hose in question. From below you can see the hose connection to the manifold where it is secured by an Oetiker clamp. Does this help to generate any ideas? Thanks for any guidance.
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Song Huang
1984 633CSi
Last 7 of VIN: 6997383
Song Huang
1984 633CSi
Last 7 of VIN: 6997383
Re: Vacuum fitting part # help?
I've got the same thing and always thought it was part of a temperature sensor.
Sansouci
84 E24 633Csi Auto, Bronzit/PearlBeige 6997510
93 E32 740il M60 Auto, Alpenweis/Ultramarine
60 528i M30 5-speed Green/Beige (crushed)
71 240Z 4-speed White/Blue (rusty & sold)
65 396 Chevelle 4-speed, Marina Blue/Black (stolen)
84 E24 633Csi Auto, Bronzit/PearlBeige 6997510
93 E32 740il M60 Auto, Alpenweis/Ultramarine
60 528i M30 5-speed Green/Beige (crushed)
71 240Z 4-speed White/Blue (rusty & sold)
65 396 Chevelle 4-speed, Marina Blue/Black (stolen)
- hornhospital
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Re: Vacuum fitting part # help?
Isn't that the "sniffer" hose for the interior temperature sensor? It uses carefully metered-down engine vacuum to draw air across the sensor above the driver's footwell.
Ken Kanne
'84 633CSi "Sylvia"; '85 635CSi "Katja";'85 325e "Hazel Ann"; '95 M3 "Ashlyn"
'84 633CSi "Sylvia"; '85 635CSi "Katja";'85 325e "Hazel Ann"; '95 M3 "Ashlyn"
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Re: Vacuum fitting part # help?
Hmm, these responses are making me think that this has nothing to do with my rough idle.hornhospital wrote: ↑Thu Oct 26, 2017 2:50 am Isn't that the "sniffer" hose for the interior temperature sensor? It uses carefully metered-down engine vacuum to draw air across the sensor above the driver's footwell.
So why does interior air get drawn into the intake manifold? Is it creating a vacuum just so air gets drawn over a sensor inside the car?
While experimenting, I did pull this vacuum tube while the car was running and it didn't make much difference.
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Song Huang
1984 633CSi
Last 7 of VIN: 6997383
Song Huang
1984 633CSi
Last 7 of VIN: 6997383
- hornhospital
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Re: Vacuum fitting part # help?
Exactly. It ensures there is airflow over the interior temperature sensor so the heat/AC system can adjust. Otherwise the interior temperature would fluctuate widely, because the sensor is small and rather buried in the dash underpanel.songzunhuang wrote: ↑Thu Oct 26, 2017 6:06 am
So why does interior air get drawn into the intake manifold? Is it creating a vacuum just so air gets drawn over a sensor inside the car?
Ken Kanne
'84 633CSi "Sylvia"; '85 635CSi "Katja";'85 325e "Hazel Ann"; '95 M3 "Ashlyn"
'84 633CSi "Sylvia"; '85 635CSi "Katja";'85 325e "Hazel Ann"; '95 M3 "Ashlyn"
Re: Vacuum fitting part # help?
But after searching realoem, I couldn't find that part or where it connects to under the dash.....
Sansouci
84 E24 633Csi Auto, Bronzit/PearlBeige 6997510
93 E32 740il M60 Auto, Alpenweis/Ultramarine
60 528i M30 5-speed Green/Beige (crushed)
71 240Z 4-speed White/Blue (rusty & sold)
65 396 Chevelle 4-speed, Marina Blue/Black (stolen)
84 E24 633Csi Auto, Bronzit/PearlBeige 6997510
93 E32 740il M60 Auto, Alpenweis/Ultramarine
60 528i M30 5-speed Green/Beige (crushed)
71 240Z 4-speed White/Blue (rusty & sold)
65 396 Chevelle 4-speed, Marina Blue/Black (stolen)
- zinnocoupe
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Re: Vacuum fitting part # help?
Song, I would suggest just getting rid of the old frayed hose section and oetiker clamp and replace it with a section of rubber hose with two hose clamps, one for the manifold end and one on the sniffer hose. I think I did that on my car when I first bought it and replaced every rubber fuel, vacuum etc line I could find. Since then I've never had any issues at all with leaking fuel or vacuum that seem to plaque these cars. I've just started the same procedure on my new e12. Some of the fuel lines near the tank are literally crumbling in my hands.
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- hornhospital
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Re: Vacuum fitting part # help?
Thank you, sir! I thought I was imagining things...and I really didn't want to drop the under panel to prove there was such a thing. I still haven't located it in the online charts (Realoem.com)
Ken Kanne
'84 633CSi "Sylvia"; '85 635CSi "Katja";'85 325e "Hazel Ann"; '95 M3 "Ashlyn"
'84 633CSi "Sylvia"; '85 635CSi "Katja";'85 325e "Hazel Ann"; '95 M3 "Ashlyn"
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Interesting Observation
So Zinnocoupe, I did exactly what you said. I came across an old Volvo part that I had when I was replacing a bunch of vacuum connections. As it turned out, it looked like it could replace the old frayed BMW part pretty well. It served a very similar function on the Volvo. Here's the old BMW part on the left compared to the new Volvo part.zinnocoupe wrote: ↑Sun Oct 29, 2017 5:35 am Song, I would suggest just getting rid of the old frayed hose section and oetiker clamp and replace it with a section of rubber hose with two hose clamps, one for the manifold end and one on the sniffer hose. I think I did that on my car when I first bought it and replaced every rubber fuel, vacuum etc line I could find. Since then I've never had any issues at all with leaking fuel or vacuum that seem to plaque these cars. I've just started the same procedure on my new e12. Some of the fuel lines near the tank are literally crumbling in my hands.
OK, so off came the old crumbly hose and on went the Volvo part.I must say it fit well and almost looks like it was designed for it!
When I was messing with the old crumbly part, I noticed something inside and decided to cut it apart. Surprise! There is an aluminum restrictor of sorts in the hose with a tiny hole in it. I guess only a slight vacuum is needed for this function. Of course I don't have that in the new Volvo part. I guess if I wanted, could jam it in the hose. For now, I'm just going to see how the Volvo part does.
If nothing else, interesting to note.
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Song Huang
1984 633CSi
Last 7 of VIN: 6997383
Song Huang
1984 633CSi
Last 7 of VIN: 6997383
- hornhospital
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Re: Vacuum fitting part # help?
That aluminum insert with the tiny hole is the "carefully metered" part I spoke of. It really needs to be in the hose.
Ken Kanne
'84 633CSi "Sylvia"; '85 635CSi "Katja";'85 325e "Hazel Ann"; '95 M3 "Ashlyn"
'84 633CSi "Sylvia"; '85 635CSi "Katja";'85 325e "Hazel Ann"; '95 M3 "Ashlyn"