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  #1  
Old 11-19-2014, 02:38 PM
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Exclamation Vacuum leak!

I have a 1995 Mercedes E320 I took it to the mechanic and he said it has a vacuum leak from the intake to the engine, he said he is still checking it out. He put the smopke machine on it and there was smoke coming out of the oil dip stick tube. In fact you could hear bubbling in there. I'm just curious after detecting a leak from the intake to the engine what is the next step? is he going to have to take the heads out? replace the intake gaskets??
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Old 11-19-2014, 02:45 PM
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Likely not have to take the heads out. Probably take the intake manifold off and replace its gasket if that is the source of the leak. Or could be something along the intake. I'm not super famliar with the M104 so someone else might be in a better place to comment on what all is needing replaced.

On the M103 (M104's predecessor) there are a number of potential vacuum leak sources. There's the idle air system, the giant boot near the butterfly. Etc
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  #3  
Old 11-19-2014, 03:24 PM
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The cruise control is fine, I am curious on why there would be smoke coming out of the oil dipstick tube when he puts on the smoke machine?
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Old 11-19-2014, 03:27 PM
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I think we would have to know more about where the smoke machine is connect before we could answer that, what is it connected to?

Is there a lot of items smoke coming out the dipstick?
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82 300SD 265k
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89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
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91 300D 2.5 Turbo. 241k
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Old 11-19-2014, 03:30 PM
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Old 11-19-2014, 05:25 PM
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PCV system. The intake is connected to the crankcase through this system. I am not familiar with the 104 either, but every engine made since the 60's has this system. It needs to be disconnected and pluged.

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Old 11-19-2014, 06:37 PM
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The smoke machine was connected to the air filter tube to the intake. The initial problem was that the RPM's go up and down when the car is in idle. smoke also comes out from the engine when you take off the engine oil cap
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