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beast02er

Need 318I Manifold Brake Booster Routing Solutions

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SO, I have a megasquirted 02 with the 318i manifold and I am chasing a really annoying vacuum leak. I've done some stuff with the throttle body thinking it was that......but test drove yesterday and proved it wasn't that. SO, since it improved, I'm thinking it is coming from the brake booster vacuum line since that is one of the 2 things I took apart/off in the process.

 

I need some pictures or ideas on how to do this, my nipple comes straight up off the booster, which is under the manifold, so I have a couple of brass elbows in line which adds up the potential places for leaks........so, how are you getting you vacuum line over the manifold and onto the booster without doing this?

 

Thanks,

 

Bryan

red73

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Not sure if this helps, but My booster has a 90* elbow.  I have the IE dual side draft manifold which has the connection at the end nearest the firewall.  I turned the elbow at the booster down and ran the hose down low out of view.  Rather than over the top.  Where does the hose connect on your manifold?

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if you want to see if the line to the booster is the issue, remove it and block it off at the manifold.  if issue goes away, the line was the problem.  if not, your setup is fine and you need to look elsewhere.

 

if you drive the car with booster line disconnected, remember it will take a little more foot power to stop the car.

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I tried going behind the manifold and back into it and it's a very convoluted route. You're better off going into that 90 degree elbow that pushes into the manifold from the engine side of the manifold between cylinders 2 and 3. Not a staight shot but less turns and a shorter run. I think theres an o-ring on that elbow that may need replacing on yours. That's where you could have a vacuum leak.

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Thanks for the tips, I got the car to make the sound (needs to be running / driving for about 20 min before it starts making it) and then went home and pulled the vac line and capped it, still made the sound. So, now I am stumped and looking for ideas.......Unless it is coming from the throttle body itself (though I fixed the assumed gasket issue), i'm stuck with either where the manifold meets the head.......or some other spot that could be causing it. Trouble is I can't pinpoint the sounds location that well.........just from the engine, everything is too loud to really tell.

 

Thanks,

 

Bryan

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