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#1
06-28-2008, 10:55 PM
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Vacuum Diaghram for 1981 380 SL
I am having a high idle problem with the car. Someone said vacuum lines are not installed properly. Also there are two large lines at the passenger side by firewall that goes to a coupler down to one line. none of these lines are connected to anythig? Can that be the problem. If anyone has a link to a clear vacuum diaghram it would be appreciated thank you redsl.
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#2
06-29-2008, 09:15 AM
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Moved
to SL Forum.
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#3
06-30-2008, 11:42 AM
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As long as you don't have any open vacuum connections, this shouldn't affect the idle. You can see if they are open by putting your finger over them with the engine running - you will feel suction if they are open.
I don't have a diagram for an '81 handy, but this may help. The vacuum for lock/unlock and the climate control system comes from a fitting on the back of the intake manifold. It is low, almost down to the bellhousing. A rubber hose connects the manifold fitting to the plastic line. The line goes to a Y, one side of which goes to the reserve tank under the passenger fender. The other goes to a bunch of Y's on the driver's firewall that split into the yellow (locking), and the green (climate control) lines. If I had to guess, I would say that the tank connection is leaking so the tank has been bypassed. This is rarely a problem with the tank, it's usually the rubber fitting that seals the hose to the tank. You can get a new one for a couple of bucks at a dealer. Someone may also have bypassed the vacuum connection to the servo.
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Chuck Taylor Falls Church VA '66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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#4
07-01-2008, 02:00 PM
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send me your email and I will shoot you a few vacuum diagrams. May not be exact to your 380, but should work.
engr693@yahoo.com
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Gary 1973 450SL 1999 Silverado 4X4 Ext Cab 1999 Mercury Sable 1972 450SL Parts car Previously owned keepers: 1967 MGCGT - 3L-6 1972 Mustang Fastback - 351C Current Cylinder Index: 37
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#5
07-02-2008, 01:33 AM
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Problem half solved
Thank you answering my question. I was able to get the diaghram from a cd rom for the 107 model. Now the fun begins trying to actually make the repairs. I know the vacuum advance on the distributor is bad and I am having a hard time finding one. I am sure you will see a lot of posts here from me on this car. I really like the car and I am hoping to have it running sometime soon.
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#6
07-03-2008, 06:09 PM
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380 distributor
I may have a distributor for your car , have you found that the plate does not advance when vacuum is applied to your advance diaphram? ...BUT most likely the idle speed control box is faulty AND it can be opened and resoldered .. Do a search here for " Idle Speed Control Box ". remove it, it just unplugs, take the cover off , plug it back in and SLIGHTLY twist or flex the circut board while the engine is running ,, sometimes the hairline cracks reconnect for a couple of seconds while twisting the board and the idle will lower ,,, that's how I found out that my ISCB was faulty .. I did resolder mine and it worked fine .. I also have a newer ISCB if you find fault with yours and can't repair it , mine is a EURO 380 so the newer ISCB I have for U.S. models won't fit my 380 ..Good Luck..
Ben Last edited by Benz Mercedes; 07-03-2008 at 06:32 PM.
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#10
07-05-2008, 03:31 PM
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To answer your e-mail
RE: vacuum routings.
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#11
07-05-2008, 03:32 PM
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To answer your e-mail #2
RE: vacuum routings.
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