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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 04-16-2011, 09:18 AM
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Might we be able to list, with pics (realoem diagrams ok) of ALL E39 vacuum lines?

This is a thread asking everyone to pitch in by identifying a vacuum hose each, both ends, and what it does, please (pretty please).

While I was researching to help on this thread where the common vacuum leak was being debugged:
- E39 (1997 - 2003) > Rough Idle

The obvious question came up:
Quote:
Originally Posted by 03 530 View Post
... is there a diagram I can look at so I can see all the hoses and start replacing them?
Then I realized we don't (to my knowledge) have a comprehensive thread containing a diagram and/or a picture identifying ALL the vacuum hoses (and where they go on each end) of the E39.

Since there are a LOT of vacuum issues (I have one myself), it would be valuable to have a complete outline of all the vacuum hoses.

It can be done. For example, we (the tribal we) did it together for the CCV (outlining all the hoses & all end points, with pictures & diagrams):
- Diagrams & pictures of all points of the E39 crankcase ventilation system (1)

Would people kindly pitch in and help us list all the vacuum hoses in the E39 engine bay?
  • Name & description would be nice, including perhaps the function, if known
  • Photo or diagram would be nice, particularly if it shows the end points
Here, for example, are pictures of both ends of the broken vacuum hose in the aforementioned "rough idle" thread, which, I, for one, have no idea where it goes & what it does.



If each of us pitches in with a picture of the end points & a description of just one vacuum hose in the E39 engine bay, we'd have a useful reference for all!
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  #2  
Old 04-24-2011, 09:56 PM
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I ended up changing that hose piece, and all 6 sparkplugs to find out that the main problem might be the hose on top of that, only cost me about $0.87 from autozone to get that hose he said that usually happens because the precut is a bit small and from excessive pulling, tugging, and heat it gets brittle to the point it just falls apart.. so i'll be going to autozone to hopefully change the top part of that vacuum hose on the intake i'll get back with the results thanks for all the help.
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  #3  
Old 04-25-2011, 04:13 AM
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M54 engine - The Secondary Air Pump valve (Part #4) below has given me issues in the past although it is not related to the intake manifold. This vacuum hose actuates the SAP valve. Because it is positioned alongside the valve cover, it is exposed to the heat from the exhaust manifold, which makes it very brittle over time. Whenever I have replaced a valve cover gasket (as part of the Vanos seal replacement), this hose always cracks when you move the hose and O2 sensor wires out of the way. You only need about 6" of vacuum hose to connect the plastic hose portion (#3) to the SAP valve (#1).
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  #4  
Old 04-25-2011, 05:31 AM
spamboxer spamboxer is offline
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vacuum hose

that broken vacuum hose goes to fuel filter pressure regulator:
#13 on that diagram:


and here's link to site:
http://bmwfans.info/parts/catalog/E3...sue_regulator/
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  #5  
Old 04-25-2011, 02:04 PM
03 530 03 530 is offline
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Quote:
Originally Posted by spamboxer View Post
that broken vacuum hose goes to fuel filter pressure regulator:
#13 on that diagram:


and here's link to site:
http://bmwfans.info/parts/catalog/E3...sue_regulator/
great job with a diagram and information.
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  #6  
Old 04-25-2011, 10:39 PM
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This older thread, from cn90 himself, shows one novel way to test MAF fuel-trim leaks:
- E39 (1997 - 2003) > Found this Ingenious VACUUM LEAK Testing Trick

That thread, interestingly enough, shows how to find vacuum leaks using both vacuum and with pressure!

Sort of like fighting fire with fire!
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  #7  
Old 06-07-2011, 11:15 PM
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Today, after reading a battling-vacuum-leaks thread, I added the following to the bestlinks for future reference (and improvement):

- How to diagnose a BMW E39 engine misfire (1) & how to battle E39 vacuum leaks (1) (2) (3) & how to solve specific vacuum leak diagnostic trouble codes such as P0171, P0174, P0313 (1) & P0170, P0173 (1)
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  #8  
Old 10-04-2011, 12:38 AM
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Searching for a vacuum hose diagram and came across this. I know one vacuum line has been replaced but I don't know which one or where. I throw lean codes on cold mornings again so I know it is vacuum.
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Last edited by 530iman; 10-04-2011 at 12:39 AM.
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  #9  
Old 10-04-2011, 12:38 AM
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Searching for a vacuum hose diagram and came across this. I know one vacuum line has been replaced but I don't know which one or where. I throw lean codes on cold mornings again so I know it is vacuum. Just bumping the thread for others to see or add!!
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  #10  
Old 10-06-2011, 05:38 AM
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Quote:
Originally Posted by 530iman View Post
Searching for a vacuum hose diagram and came across this
E39 vacuum hose overhaul:

If we could find a list of all the E39 vacuum hoses, (or create it), then we might be able to buy replacement tubing at the local autoparts store, in bulk, and simply cut lengths to fit.

QUESTION:
Q: Is there only one vacuum hose size (ID/OD) & material (rubber?) or are there multiple sizes & materials for the vacuum hoses in the E39?

BUMP: See also this new thread just now:
- E39 (1997 - 2003) > M54 vacuum hoses ... what diameter ... what brand ... what material ... what length?




Last edited by bluebee; 10-12-2011 at 12:53 AM.
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  #11  
Old 10-13-2011, 12:34 PM
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It looks like it will cost about $300 to replace all the M54-engine vacuum lines at the dealer at just the Realoem nominal prices (and even worse at the three Silicon Valley BMW dealers who are often twice or three times Realoem nominal prices).
- M54 vacuum hoses ... what diameter ... what brand ... what material ... what length?

But, at least we should list the hoses, the sizes, and the part numbers for others to benefit.

Q: Is this the complete diagramatic list of related vacuum hoses (for the M54 reference engine anyway)?

Please let us know which diagrams are missing (for the M54 reference engine).
  1. Engine => Intake manifold => Intake manifold system
  2. Engine => Vacuum control => AIR PUMP F VACUUM CONTROL
  3. Engine => Exhaust manifold => EMISSION CONTROL-AIR PUMP
  4. Fuel Preparation System => Fuel Supply => Fuel filter, pressure regulator
  5. Engine => Vacuum control => Vacuum control - engine
  6. Fuel Preparation System => Fuel injection system => FUEL TANK BREATHER VALVE
  7. Engine => Cylinder Head => Crankcase-Ventilation/oil separator
  8. Fuel Preparation System => Fuel injection system => Hot-film air mass meter
  9. Fuel Preparation System => Fuel injection system => VALVES/PIPES OF FUEL INJECTION SYSTEM
  10. What other Realoem diagrams show M54-engine vacuum-related tubes, pipes, hoses, encaps, & o-rings?
Engine => Intake manifold => Intake manifold system


Engine => Vacuum control => AIR PUMP F VACUUM CONTROL



Engine => Exhaust manifold => EMISSION CONTROL-AIR PUMP



Fuel Preparation System => Fuel Supply => Fuel filter, pressure regulator



Engine => Vacuum control => Vacuum control - engine


Fuel Preparation System => Fuel injection system => FUEL TANK BREATHER VALVE


Engine => Cylinder Head => Crankcase-Ventilation/oil separator
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Last edited by bluebee; 11-06-2011 at 10:18 AM.
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  #12  
Old 10-13-2011, 01:00 PM
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Awesome; the vacuum lines in these cars are a dog's regurgitated breakfast, especially in the V8. The I6 is a lot simpler, I think, but having a comprehensive map is always good. Similar to the cooling and suspension overhauls, it's good to have a list of every part, so that when you're chasing a vacuum leak you can just have at it and replace all the hoses, and realize that the whole time it was the intake boot elbow (or something like that)!

The hoses that aren't standard vacuum hose size are, as far as I know, a BMW part #, but in some cases it'll be possible to replace them with generic rubber hose of OD x and ID y. They aren't supposed to be exposed to any gasoline, oil, or coolant, so the key function is water- and airtightness and temperature resistance. They don't even need to be particularly flexible, provided they don't collapse on themselves.
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Last edited by bmw_n00b13; 10-13-2011 at 01:01 PM.
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  #13  
Old 10-13-2011, 04:57 PM
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Quote:
Originally Posted by bmw_n00b13 View Post
it's good to have a list of every part
To that end, here is, as far as I can construct, the list of those generic vacuum hoses above:

Engine => Intake manifold => Intake manifold system
  • #15, Cap, D=3,5MM, Qty=2, 11611437560, $3.39 (between 1/8" & 9/64" ID)
  • #17, Cap, D=7,0MM, Qty=1, 11611727176, $3.39 (between 17/64" & 19/32" ID)
Engine => Vacuum control => AIR PUMP F VACUUM CONTROL
  • 04 VACUUM HOSE BLACK 3.3X1.8 11657803732 $16.43 (two pieces)
  • 03 VACUUM PIPE 1 11727574490 $27.94 (one piece)
  • 07 VACUUM HOSE BLACK 3.3X1.8 11657803732 $16.43 (two pieces)
  • 09 VACUUM CAP (no part number shown)
Engine => Exhaust manifold => EMISSION CONTROL-AIR PUMP
  • 05 PRESSURE HOSE ASSY 1 11721435456 $22.73
Fuel Preparation System => Fuel Supply => Fuel filter, pressure regulator
  • 13 VACUUM HOSE BLACK 3,5X1,8 11727545323 $14.82
  • 11 Hose 1 13321437801 $24.87
Engine => Vacuum control => Vacuum control - engine
  • 02 Hose elbow 1 11617503666 $8.17
  • 03 Hose elbow 1 11617547582 $17.25
Fuel Preparation System => Fuel injection system => FUEL TANK BREATHER VALVE
  • 03 fuel tank breather line 1 13907557924 $27.77
  • 04 fuel tank breather line 1 13907504303 $27.77
Engine => Cylinder Head => Crankcase-Ventilation/oil separator
  • 02 Vent pipe 1 11611432559 $25.73
  • 03 Connecting line 1 11617504535 $33.87
  • 04 Vent hose 1 11157532649 $15.37
  • 06 VACUUM HOSE BLACK 3,5X1,8 ? 11727545323 $14.82 (not on all E39s)
  • 07 Return pipe 1 11617504536 $33.87
Total vacuum hose nominal cost sans CCV system = $186.45 (assuming $5 for the vacuum cap); $310.11 if you add the CCV hoses; and $367.74 if you add the CCV valve (plus 8.75% sales tax).

QUESTION: Are there any 'other' M54 vacuum hoses that we missed?

NOTE: This size chart is from here:

Last edited by bluebee; 10-28-2011 at 12:31 AM.
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  #14  
Old 10-14-2011, 04:22 PM
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Bluebee, this is great info and I love the diagrams.
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  #15  
Old 10-15-2011, 11:03 AM
mach.schnell mach.schnell is offline
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Quote:
Originally Posted by 530iman View Post
Bluebee, this is great info and I love the diagrams.
Same diagrams as in the E46, but they also are wrong (for the E46). In the third diagram down titled "Vacuum control - Engine" shows an elbow #6 which in reality is the "F" connector on most E46's.

In the fifth diagram down, hose #6 on the CCV has been blocked off on newer units, esp. on the cold weather cludge fix. (I've been meaning to post where these now go, but...)


You asked in this pic -


You circled #4 from diagram one - "Air Pump F Vacuum Control."

Use NAPA orange silicone vacuum hose. This won't deteriorate. (I'd show pictures and part numbers but I've run out of time.)

BTW part #3 (at least on my E46) is a plastic "non-flex" tube that shouldn't deteriorate.



(And sorry if offend any M5 purists with E46 info.)
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  #16  
Old 10-16-2011, 01:17 PM
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Quote:
Originally Posted by mach.schnell View Post
In the third diagram down titled "Vacuum control - Engine" shows an elbow #6 which in reality is the "F" connector on most E46's.
Thank you very much for clarifying that! Since the E46 is a sister machine to the E39 (e.g., same M54 engine that I have in my E39), your information is welcome.
- What diagrams correspond to the two vacuum hoses on the M54 air intake F connector?



Quote:
Originally Posted by mach.schnell View Post
In the fifth diagram down, hose #6 on the CCV has been blocked off on newer units
I found the same circumstance where the realoem diagram shows that CCV vacuum hose in all diagrams, while only 'some' vehicles have it. So, again, thanks for clarifying that for us.

There are lots of pictures, specifically on the CCV, over here:
- How to test the crankcase ventilation (aka CCV, CVV, PCV, CPV, & OSV) pressure regulating valve system (1)



Quote:
Originally Posted by mach.schnell View Post
Use NAPA orange silicone vacuum hose.
That's a GREAT suggestion! Unfortunately, I found the local Autozone & Kragen/O'Reilly stores woefully deficient in vacuum hoses ... so let's recommend the NAPA orange-silicone moving forward.

Quote:
Originally Posted by mach.schnell View Post
BTW part #3 (at least on my E46) is a plastic "non-flex" tube that shouldn't deteriorate.
We probably have the same engine. The hose is plastic and 'should' be OK, but, mine broke off at the tip when I tried to wrestle the rubber hose that was baked on the end.

But, at almost $30 for a plastic 'straw', I too would leave the original in place unless I knew it to be bad!
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  #17  
Old 10-17-2011, 09:55 PM
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Based on charcoal canister information in this thread today, I've updated the realoem diagram below to be more clear as to the end points of the hoses:
- E39 (1997 - 2003) > fuel tank breather valve 2001 525


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Old 10-22-2011, 10:52 AM
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I'm finding it more difficult than one would think to simply find the ends of some of these vacuum hoses:
- How to find the ends of hard-to-locate vacuum hoses (1)

But, in doing my research, I found this Poolman thread which shows yet another spot to look for to locate vacuum leaks:
- E39 (1997 - 2003) > Battling Vacuum Leaks

Quote:
Originally Posted by poolman View Post
Just found a new spot to check when looking for vacuum leaks.

Under the cover on top of the engine hiding the injectors -- there is a lattice-looking part that runs to the top of the intake and goes to each runner -- that's the runner that bring whatever blow by that's coming thru the engine, back into the manifold to be consumed by the engine. There are plastic tubes coming from the oil separator to this part.

Now with the cover off, I noticed there are little tubes coming off of this part going down into the top of the intake manifold--one at each runner.

I presume there is a rubber 0 ring on each part to seal it all from vacuum leaks.

I got the idea to take a straw and fill it with water and let the water drain into each area around where the tubes fit into the intake. With water filling the crevice around each of these little tubes. I cranked the car--on each and every tube the water sat there just as I had filled the area.

On the very back though I noticed that there wasn't any water sitting on top. I cut off the engine got my straw out again and tried to fill the back part again with water--it wouldn't fill --water just drained down into the intake there.

Thats a vacuum leak for sure
--now I gotta figure out how to seal it.---This also means that that back cylinder is most likely running a little lean at times. Below is a picture with the red area where my leak lies.

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Last edited by bluebee; 10-27-2011 at 01:51 PM. Reason: Modified the quote slightly so that it is more readable ...
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Old 10-28-2011, 10:41 PM
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In keeping with the pictorial nature of this thread locating all vacuum hoses & ports on the E39 ... and because the realoem diagrams are woefully inadequate for vacuum hoses ...

This thread has a nice picture of the rubber boots:
- Detailed DIY for Crankcase Ventilation Valve Overhaul for the M52TU Motor

Notice the distinctly DIFFERENT shapes and ports in the various engines:


Here is a Fudman E39 530i rubber boot from this thread:
- Replacement of the CCV on M54

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Last edited by bluebee; 10-28-2011 at 11:09 PM.
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Old 10-29-2011, 12:49 AM
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Pictures of all three vacuum endcaps in the E39

Because of the ambiguity of the realoemm endcap diagrams ... I'm only slowly finding pictures for the locations for the (up to) THREE vacuum endcaps.

Note: If you already have a picture or diagram of these (up to) three vacuum endcaps, please post.
  • This diagram loosely intimates there is one capped vacuum port:
  • This diagram outright says there are three capped vacuum ports:
I 'think' pictures or diagrams of those three vacuum endcaps might be:

1) #17, 7mm (between 17/64" & 19/32") endcap for the M54 engine rear vacuum port:


2) #15, 3.5mm endcap (between 1/8" & 9/64" ID) for the CCV valve vacuum port.

I CAN NOT FIND ANY DIAGRAMS OR PICTURES ON THE WEB OF THIS CCV ENDCAP!

3) #15, 3.5mm endcap (between 1/8" & 9/64" ID) for the air pump vacuum port if you don't have an air pump (see details from Steve on this below).

Quote:
Originally Posted by Steve530 View Post
The three capped-off vacuum ports might be explained here:
Quote:
Parts required are:
- 3.3mm Vacuum hose, part # 11657803732 (order a metre of it)
- 7mm Cap for an unused vacuum port, part # 11611727176
- 3.5mm Cap IF you don't have the air pump (see below), part # 11611437560 (you may need a couple of these ...)
...
Not all M54 engines have the air pump ... if you don't have it, you will have a small blanking cap at the back of the manifold. Replace the blanking cap (3.5mm one) as they perish / split over time. ...
...
Beside the above connection / blanking cap, there will be a bigger vacuum cap (7mm) - replace this too, as they're even worse for splitting / perishing.
...
Next, there's a 3.3mm vacuum line going to the vacuum reservoir located very awkwardly next to the starter motor. This vacuum reservoir provides a constant vacuum (if required) for the exhaust flap IF you have one. Mine is disconnected, so I stripped out this hose & plugged the port on the inlet mainfold. However, if you want to keep the thing in operation, replace this hose too with the 3.3mm vacuum hose. If you don't have the vacuum reservoir / flap, replace the 3.5mm plug like for like (part no. 11611437560).

...
Under the inlet manifold, tucked away above the throttle body, is the oil separator valve (cyclone, CCV, whatever you want to call it). On older models, this had a vacuum hose attached to it, the other end of which was connected to the fuel pressure regulator on the fuel rail at the top front of the engine. This diagram shows the valve, the vacuum hose to the fuel pressure regulator being part # 6: ... The M54 engine saw the fuel pressure regulator change positions, and it was integrated in the fuel filter underneath the car. As BMW didn't want to develop a whole new oil separator valve, they simply capped the redundant vacuum port with a blanking cap. So part 6 on the M54 cars is a blanking cap, which again can split, and should be replaced where possible (difficult access) by part # 11611437560. Real OEM & dealers are unclear on this, so trust me.
NOTE: This endcap is variously termed as a:
- Rubber bunge
- Vacuum endcap
- Cap
- Blanking cap
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  #21  
Old 11-03-2011, 01:39 PM
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Steve530 replaced all his 1/8" ID vacuum tubing with Viton of 1/8" ID with 1/8" thick walls from McMaster-Carr just today (using up a bit more than 2˝ feet).

He reported (over here) that there is yet another error in the M54 realoem diagram.

Here is his annotation that fixes the error by coloring in yellow the rigid vacuum pipe (1/8" OD) which curves around the back of the engine to connect to the short length of vacuum tubing (1/8" ID) that connects to the SAP electrical valve.


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  #22  
Old 11-06-2011, 09:39 AM
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bluebee bluebee is offline
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Thanks to Doru, there are some 7x3mm manifold vacuum and 7,52X3 or 9,2X2 fuel-injection related o-rings we need to add to the list which already contains the necessary 3.5x1.8mm, 3.3x1.8mm & 7mm ID vacuum tubing (single material), vacuum hoses (multiple material), 3.3mm OD curved vacuum pipes (rigid tubes), 3.5mm & 7mm ID vacuum endcaps (closed end) in the E39 engine bay

- Fuel injector o-ring cleaning and maintenance (1)
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  #23  
Old 11-06-2011, 10:19 AM
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bluebee bluebee is offline
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Here is a summary of what we've found, so far for vacuum-leak related pipes, hoses, tubes, caps, & O-rings:
  1. Engine => Intake manifold => Intake manifold system
    • #15, Cap, D=3,5MM, Qty=2, 11611437560, $3.39 (between 1/8" & 9/64" ID)
    • #17, Cap, D=7,0MM, Qty=1, 11611727176, $3.39 (between 17/64" & 19/32" ID)
    • 06 O-ring 7X3 Qty=6 PN=11617502761 $0.8
    • 07 DISA Adjuster unit Q=1 PN=11617544806 $212.50 (the vacuum valves can go bad)
    • DISA O-ring
      • M52TU #11617504543 OEM size 50mm ID x 3.5mm thick x 57mm OD
      • M54 Chemgigi O-ring aftermarket 51mm ID x 2.5mm thick x 56mm OD
  2. Engine => Vacuum control => AIR PUMP F VACUUM CONTROL
    • 04 VACUUM HOSE BLACK 3.3X1.8 11657803732 $16.43 (two pieces)
    • 03 VACUUM PIPE 1 11727574490 $27.94 (one piece)
    • 07 VACUUM HOSE BLACK 3.3X1.8 11657803732 $16.43 (two pieces)
    • 09 VACUUM CAP (no part number shown)
  3. Engine => Exhaust manifold => EMISSION CONTROL-AIR PUMP
    • 05 PRESSURE HOSE ASSY 1 11721435456 $22.73
  4. Fuel Preparation System => Fuel Supply => Fuel filter, pressure regulator
    • 13 VACUUM HOSE BLACK 3,5X1,8 11727545323 $14.82
    • 11 Hose 1 13321437801 $24.87
  5. Engine => Vacuum control => Vacuum control - engine
    • 02 Hose elbow 1 11617503666 $8.17
    • 03 Hose elbow 1 11617547582 $17.25
  6. Fuel Preparation System => Fuel injection system => FUEL TANK BREATHER VALVE
    • 03 fuel tank breather line 1 13907557924 $27.77
    • 04 fuel tank breather line 1 13907504303 $27.77
  7. Engine => Cylinder Head => Crankcase-Ventilation/oil separator
    • 02 Vent pipe 1 11611432559 $25.7303 Connecting line 1 11617504535 $33.87
    • 04 Vent hose 1 11157532649 $15.37
    • 06 VACUUM HOSE BLACK 3,5X1,8 ? 11727545323 $14.82 (not on all E39s; the M54 has an endcap as shown earlier)
    • 07 Return pipe 1 11617504536 $33.87
  8. Fuel Preparation System => Fuel injection system => Hot-film air mass meter
    • 03 Rubber boot Q=1 PN=13541435625 $28.30
  9. Fuel Preparation System => Fuel injection system => VALVES/PIPES OF FUEL INJECTION SYSTEM
    • 04 O-ring; 7,52X3,52; Q=6; PN=13641437487; $3.75
    • 05 O-ring; 9,2X2,8; Q=6; PN=13641437486; $3.75
  10. What other Realoem diagrams show M54-engine vacuum-related tubes, pipes, hoses, encaps, & o-rings?
Do we have any vacuum-related GASKETS to list?
- What specific gaskets could be a cause of vacuum-related or lean-misfire codes?

Last edited by bluebee; 11-06-2011 at 10:58 AM.
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  #24  
Old 11-26-2011, 10:05 AM
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bluebee bluebee is offline
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Mein Auto: 02 BMW 525i M54 auto 130K
For the record, we just updated the purge valve diagram above based on 16valex' and JimLev's clarifications over here:
- E39 (1997 - 2003) > EVAP Purge Valve Flow



Note: We still need a decent picture of the E39 charcoal canister in situ.
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  #25  
Old 06-01-2012, 03:36 PM
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Trebbia Trebbia is offline
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Mein Auto: BMW E39 I6
Quote:
My turn for misfires due to air/vacuum leaks.

I'm in the shop right now (Ray's Ultimate BMW in Santa Clara, CA) for the $150 smoke diagnostic test.
They removed all the rubber & plastic housings from the engine air filter back to the windshield, including the cabin air filter.
They left only the large rubber boot connected to the ICV, which they put a latex glove over the 6 inch opening.
Then they removed the endcap on the back of the M54 where they hooked up the smoke machine.

Looking from under the car, smoke immediately was coming out of the lower CCV hose (which had a half-inch crack in it).
[ I wonder why/how it passed my CCV test - I probably didn't look hard enough! ]

They quickly replaced the lower CCV hose ($100) and running the smoke test again.
[ I thought the CCV was hard to get to but they said they didn't have to remove anything. ]

They said they visually saw a crack in the small bent finger in the rubber boot connected to the ICV.
They were going to charge me over $200 to replace that $20 boot when I put a stop to this nonsense.
[ In hindsight, I should not have paid them $100 to replace the lower CCV hose! ]

I picked up the $20 ICV rubber boot at the stealer instead of paying the $200 for someone else to do it for me.
[ I'll need three cold-start drive cycles to erase the MIL. ]

By the way, with a smoke machine, they make this look so simple to debug!
[ In double hindsight, I should have just bought a smoke machine if I could have gotten it for less than around $400. ]

Do these home made smoke machines actually work?
After (1) paying someone to diagnose and replace a holed lower CCV-to-dipstick hose, my (new) advice is to (2) just replace all the rubber in the engine bay, or (3) buy/borrow a smoke machine.

With #1, you get a single hose for hundreds of dollars.
With #2, you get all new hoses, for about the same amount.
With #3, you get a single hose plus a test instrument, for about the same amount.

At this age of the E39, it might be nice to ask our sponsors to put together a complete rubber kit!

Last edited by Trebbia; 06-02-2012 at 08:56 AM.
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