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mtsipe Samba Member
Joined: June 22, 2016 Posts: 86 Location: Wilmington, Delaware
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Posted: Wed Oct 03, 2018 4:28 am Post subject: Superbeetle vacuum hose |
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I am curious if this picture of vacuum line is correct for a 1976 Super Beetle with Fuel Injection. Also, I have a vacuum port (single) on my distributor and I would like to know what it connects to (throttle body maybe? IDK). Thanks
This is what my distributor looks like (just a stock image from the web)
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74Shovel Samba Member
Joined: October 18, 2017 Posts: 165 Location: Yakima, WA
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Posted: Wed Oct 03, 2018 9:28 am Post subject: Re: Superbeetle vacuum hose |
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I went out and took a look at my ‘78 fuelie, but my distributor is not vacuum advance. In my experience, vacuum advance distributors are referenced from the intake. Take a look at your intake track to see if there are any vacuum ports that are unused or capped off. The photo below is a port which is capped off on my ‘78. I don’t know if the distributor was replaced at some point or if a past owner just needed an expedient way to replace a missing vacuum cap. Also, is your car running bad at high rpms, or are you just concerned about the missing vacuum line?
_________________ Just because you can doesn't mean you should.
'78 Super Convertible |
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mtsipe Samba Member
Joined: June 22, 2016 Posts: 86 Location: Wilmington, Delaware
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Posted: Wed Oct 03, 2018 9:57 am Post subject: Re: Superbeetle vacuum hose |
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74Shovel wrote: |
I went out and took a look at my ‘78 fuelie, but my distributor is not vacuum advance. In my experience, vacuum advance distributors are referenced from the intake. Take a look at your intake track to see if there are any vacuum ports that are unused or capped off. The photo below is a port which is capped off on my ‘78. I don’t know if the distributor was replaced at some point or if a past owner just needed an expedient way to replace a missing vacuum cap. Also, is your car running bad at high rpms, or are you just concerned about the missing vacuum line?
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I have not attempted to fire it up yet. I purchased this super with a seized engine. I took photos but maybe not enough. I removed the engine and had it rebuilt at a machine shop. I installed all the tin, oil cooler, injectors, doghouse, generator, etc before reinstalling the motor back in. Im coming close to installing the intake and air filter at this point.
There was a cap on the throttle body on mine just as in your photo. I read somewhere that the vacuum on the distributor is supposed to speed up timing when the throttle is open. I put a little wire into where it was capped off and it didn't go through. A bunch of brown, dry dust was clogging it up.
Anyway, I have been looking exhaustively through my Bentley Manual to pull up a vacuum diagram but can't seem to find anything pertaining to the vacuum hoses.
Is there a way you could possibly take a photo of your engine bay so I can have some kind of reference for the vacuum lines? Or is it similar to the original photo I pulled from the web.
Thanks |
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74Shovel Samba Member
Joined: October 18, 2017 Posts: 165 Location: Yakima, WA
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Posted: Wed Oct 03, 2018 1:13 pm Post subject: Re: Superbeetle vacuum hose |
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Although I am not an expert, I do know VW made minor changes to the fuel injection systems from the time it was introduced until U.S. sales ended in ‘79. That could explain why you have a vacuum advance distributor on your ‘76, and my ‘78 doesn’t have one. Previous owners also mess with things and muddy the water. The photos below will hopefully help. And don’t feel too bad about not getting enough photos. When I rebuilt straight 6 engine in my old Jeep, I took photos and made a sketch of all the vacuum line routing. Unfortunately, I forgot to note the position of the distributor, and wound up putting it in 180 degrees out of phase. That mistake took me hours to resolve in a time before internet enthusiast forums.
_________________ Just because you can doesn't mean you should.
'78 Super Convertible |
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Randy in Maine Samba Member
Joined: August 03, 2003 Posts: 34890 Location: The Beach
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Posted: Wed Oct 03, 2018 1:43 pm Post subject: Re: Superbeetle vacuum hose |
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Some one put a different distributor on your 78 Super. |
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Dwayne1m Samba Member
Joined: December 31, 2011 Posts: 3538 Location: Pennsylvania
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Posted: Wed Oct 03, 2018 2:03 pm Post subject: Re: Superbeetle vacuum hose |
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Randy in Maine wrote: |
Some one put a different distributor on your 78 Super. |
^^^^ You should have a dual vacuum distributor.^^^^
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busdaddy Samba Member
Joined: February 12, 2004 Posts: 51117 Location: Surrey B.C. Canada, but thinking of Ukraine
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Posted: Wed Oct 03, 2018 2:06 pm Post subject: Re: Superbeetle vacuum hose |
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waxhead wrote: |
I have just started reproducing this sticker, found on the inside of the deck lid of late-model fuel injected cars.
Accurate reproduction printed on silver foil, then laminated for durability. See my ads to order.
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_________________ Rust NEVER sleeps and stock never goes out of style.
Please don't PM technical questions, ask your problem in public so everyone can play along. If you think it's too stupid post it here
Stop dead photo links! Post your photos to The Samba Gallery!
Слава Україні! |
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74Shovel Samba Member
Joined: October 18, 2017 Posts: 165 Location: Yakima, WA
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Posted: Wed Oct 03, 2018 2:09 pm Post subject: Re: Superbeetle vacuum hose |
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If it’s the wrong one i’m not about to change it, the bug runs great. The golden rule of car maintenance: If it’s not broken, don’t fix it! _________________ Just because you can doesn't mean you should.
'78 Super Convertible |
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busdaddy Samba Member
Joined: February 12, 2004 Posts: 51117 Location: Surrey B.C. Canada, but thinking of Ukraine
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Posted: Wed Oct 03, 2018 7:38 pm Post subject: Re: Superbeetle vacuum hose |
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74Shovel wrote: |
If it’s the wrong one i’m not about to change it, the bug runs great. The golden rule of car maintenance: If it’s not broken, don’t fix it! |
Suit yourself, some people never realize just how nice a VW can run and think "kind of OK....sort of" is "runs great", you'll never know what you are missing. _________________ Rust NEVER sleeps and stock never goes out of style.
Please don't PM technical questions, ask your problem in public so everyone can play along. If you think it's too stupid post it here
Stop dead photo links! Post your photos to The Samba Gallery!
Слава Україні! |
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nidlezp Samba Member
Joined: March 23, 2014 Posts: 5 Location: United States
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Posted: Sat Aug 28, 2021 12:12 pm Post subject: Re: Superbeetle vacuum hose |
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Sorry to resurrect an old thread, but I was just going through replacing old vacuum hoses on a '79 'Vert that runs pretty well, except it takes 2-3 times to start it from completely cold. The car seems to have been maintained well before me. When I pulled the bottom hose from the deceleration valve I noticed that there is a bolt shank inserted into the hose to block it off. What would that do?
Thank you in advance... |
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busdaddy Samba Member
Joined: February 12, 2004 Posts: 51117 Location: Surrey B.C. Canada, but thinking of Ukraine
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Posted: Sat Aug 28, 2021 12:16 pm Post subject: Re: Superbeetle vacuum hose |
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Welcome!
Maybe it was to compensate for a leaking decel valve?, or someone who didn't know what they were doing thinking they were deleting some "power robbing smog crap".
Hook it back up and see what happens.
As for the reluctant starts, have you ever done a full tune up and valve adjustment?, how is the timing set?, does the vacuum advance and retard (if equipped) function properly? _________________ Rust NEVER sleeps and stock never goes out of style.
Please don't PM technical questions, ask your problem in public so everyone can play along. If you think it's too stupid post it here
Stop dead photo links! Post your photos to The Samba Gallery!
Слава Україні! |
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heimlich VWNOS.com
Joined: November 20, 2016 Posts: 6590 Location: Houston, Texas
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Posted: Sat Aug 28, 2021 2:24 pm Post subject: Re: Superbeetle vacuum hose |
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The 76 and 78 should both have a vacuum distributor. It might run well with what you have but it will run great with an original Bosch new or rebuilt unit. _________________ www.vwnos.com [email protected]
Classic Brands. Classic Quality.
Not all parts are made the same. NOS OE/OEM parts made mainly in West Germany, Early Germany, and Early Brazil are where VW produced the best quality parts and best fitting products.
5% Off your order with coupon code: 5%OFF
Restored Distributors Available (<--Click here) |
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Lost69Convertible Samba Member
Joined: July 29, 2020 Posts: 445 Location: Rhode Island
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Posted: Sun Aug 29, 2021 7:42 am Post subject: Re: Superbeetle vacuum hose |
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nidlezp wrote: |
When I pulled the bottom hose from the deceleration valve I noticed that there is a bolt shank inserted into the hose to block it off. What would that do?
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The ECU for your Bosch L-Jet FI is a single-state analog controller. Unlike modern digital multi-state controllers, your L-Jet ECU basically does one thing. Your ECU has complete control of the fuel/air mixture when the engine is warmed up: idling, accelerating, and cruising at speed.
At other times (or states), vacuum and thermo-time systems step in to assist. One of these states is when you’re at cruising speed and you lift off the gas pedal. The Decel valve steps in, sends a vacuum signal to the fuel pressure regulator, and dumps the fuel ring back to the gas tank to lower the fuel pressure. This partially starves the fuel injectors and decreases fuel to the cylinders.
I reconnected my Decel valve last Fall. The engine decelerates smoother and small backfires have been eliminated. _________________ 1956 Beetle Ragtop: My Father's car
1969 Beetle Convertible: My first car. I loved it, I lost it, and I never got over it.
1979 Super Beetle Convertible |
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nidlezp Samba Member
Joined: March 23, 2014 Posts: 5 Location: United States
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Posted: Sun Aug 29, 2021 8:05 am Post subject: Re: Superbeetle vacuum hose |
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busdaddy wrote: |
Welcome!
Maybe it was to compensate for a leaking decel valve?, or someone who didn't know what they were doing thinking they were deleting some "power robbing smog crap".
Hook it back up and see what happens. |
Thank you. The rest of the car seems to indicate that it was professionally maintained. I may remove the plug and see what happens.
busdaddy wrote: |
As for the reluctant starts, have you ever done a full tune up and valve adjustment?, how is the timing set?, does the vacuum advance and retard (if equipped) function properly? |
To be completely honest, I'm worried about fixing something that's not broken. I know VW recommended pretty frequent valve adjustments, but do they need to be done if the valves are not making any noise? |
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nidlezp Samba Member
Joined: March 23, 2014 Posts: 5 Location: United States
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Posted: Sun Aug 29, 2021 8:06 am Post subject: Re: Superbeetle vacuum hose |
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heimlich wrote: |
The 76 and 78 should both have a vacuum distributor. It might run well with what you have but it will run great with an original Bosch new or rebuilt unit. |
Thank you, makes sense. |
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nidlezp Samba Member
Joined: March 23, 2014 Posts: 5 Location: United States
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Posted: Sun Aug 29, 2021 8:08 am Post subject: Re: Superbeetle vacuum hose |
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Lost69Convertible wrote: |
nidlezp wrote: |
When I pulled the bottom hose from the deceleration valve I noticed that there is a bolt shank inserted into the hose to block it off. What would that do?
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The ECU for your Bosch L-Jet FI is a single-state analog controller. Unlike modern digital multi-state controllers, your L-Jet ECU basically does one thing. Your ECU has complete control of the fuel/air mixture when the engine is warmed up: idling, accelerating, and cruising at speed.
At other times (or states), vacuum and thermo-time systems step in to assist. One of these states is when you’re at cruising speed and you lift off the gas pedal. The Decel valve steps in, sends a vacuum signal to the fuel pressure regulator, and dumps the fuel ring back to the gas tank to lower the fuel pressure. This partially starves the fuel injectors and decreases fuel to the cylinders.
I reconnected my Decel valve last Fall. The engine decelerates smoother and small backfires have been eliminated. |
I'll try removing the plug and seeing what happens - it currently does have small backfires when letting off the throttle. |
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busdaddy Samba Member
Joined: February 12, 2004 Posts: 51117 Location: Surrey B.C. Canada, but thinking of Ukraine
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Posted: Sun Aug 29, 2021 8:45 am Post subject: Re: Superbeetle vacuum hose |
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nidlezp wrote: |
I know VW recommended pretty frequent valve adjustments, but do they need to be done if the valves are not making any noise? |
Yes, if they aren't making a tiny bit of noise they are too tight, that can cause all sorts of issues, some expensive. Regular valve adjustments also allows you to monitor engine health, if one is changing every time there's something bad happening. They should be at least checked every second oil change. _________________ Rust NEVER sleeps and stock never goes out of style.
Please don't PM technical questions, ask your problem in public so everyone can play along. If you think it's too stupid post it here
Stop dead photo links! Post your photos to The Samba Gallery!
Слава Україні! |
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nidlezp Samba Member
Joined: March 23, 2014 Posts: 5 Location: United States
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Posted: Mon Aug 30, 2021 1:13 pm Post subject: Re: Superbeetle vacuum hose |
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busdaddy wrote: |
nidlezp wrote: |
I know VW recommended pretty frequent valve adjustments, but do they need to be done if the valves are not making any noise? |
Yes, if they aren't making a tiny bit of noise they are too tight, that can cause all sorts of issues, some expensive. Regular valve adjustments also allows you to monitor engine health, if one is changing every time there's something bad happening. They should be at least checked every second oil change. |
Good points, will do, thanks. |
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MuzzcoVW Samba Member
Joined: February 21, 2018 Posts: 1462 Location: Westfield, MA.
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Posted: Tue Aug 31, 2021 5:52 am Post subject: Re: Superbeetle vacuum hose |
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74Shovel wrote: |
If it’s the wrong one i’m not about to change it, the bug runs great. The golden rule of car maintenance: If it’s not broken, don’t fix it! |
Respectfully, I couldn't disagree more. Vacuum advance makes these run awesome around town. Mine had a 009 when I started running my F.I. Bug. Switched to the proper unit and it was like having an extra cylinder for low end power! I knew a 009 has no place in that application, but had to try |
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