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#1
07-19-2015, 09:48 AM
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Vacuum line under intake to throttle body?
I found the same issue with both my 1991 300SL and my 1990 300E last night. A vacuum line that connects to a small nipple under the intake manifold just to the left of the throttle body (you have to look hard to see the nipple just to the left of the rubber boot connecting the throttle body to the manifold) was disconnected.
I went ahead and used a wire tie to bind it to a rigid tube next to the line along its path to the nipple so that it stays properly aligned and to eliminate any tension in the line. What is the purpose of this vac line? Now that it is connected, what difference should it make? Thanks, AL
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03 CLK430 Cabrio 211K Pweter Silver/ Oyster Leather 90 300SEL 214k Pearl Black/ Alto Grey/Black Leather Prior: 85 190E, 88 300TE, 89 300TE, 90 300E 2.6, 90 300TE, 92 300E 2.6, 91 and 93 300SL, 87 Ferrari Mondial Cabrio 
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#2
07-19-2015, 10:38 AM
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I think there are 2 nipples: one is capped off and one is used for measuring air into the intake I think.
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 1990 190E 3.0L
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#3
07-19-2015, 11:33 AM
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It is where the engine pulls in fuel vapor from the gas tank. When its disconnected you occasionally get a whiff of fuel and risk a fire.
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 90 300TE 4-M Turbo 103, T3/T04E 50 trim T04B cover .60 AR Stage 3 turbine .63 AR A2W I/C, 40 LB/HR MS2E, 60-2 Direct Coil Control 3" Exh, AEM W/B O2 Underdrive Alt. and P/S Pulleys, Vented Rear Discs, .034 Booster. 3.07 diffs 1st Gear Start 90 300CE 104.980 Milled & ported head, 10.3:1 compression 197° intake cam w/20° advancer Tuned CIS ECU 4° ignition advance PCS TCM2000, built 722.6 600W networked suction fan Sportline sway bars V8 rear subframe, Quaife ATB 3.06 diff
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