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Old 04-07-2010, 04:37 PM   #1
Aloush
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Oil in intake boot..

Soo for a while I have been experiencing heavy studdering and power cutoffs under load. I have looked everything and changed many things such as O2 sensor, fuel filter etc.

still no differece. Just few days ago i started taking apart the engine top inorder to change the headgasket. As I removed the intake parts i found oil all around the walls of the intake boot and throttle body covered with oil.. It was shocking to see and i think it definately is whats causing the studdering (something needs to be cleaned). Also been feeling the car throttle response has decreased significantly.

I will be cleaning all that oil but was wondering if anyone can help me figure out where its coming from and how can I avoind it. Maybe its the breather.
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Old 04-07-2010, 06:13 PM   #2
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Yup, it's from the breather. Normal, just needs to be cleaned. Adjust your throttle cable as well... will give you a nice pedal feel, and better response.
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Old 04-07-2010, 08:03 PM   #3
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Yup, it's from the breather. Normal, just needs to be cleaned. Adjust your throttle cable as well... will give you a nice pedal feel, and better response.
ok good.. how do you adjust the throttle cable ?

is there anything else i should be cleaning ?
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Old 04-07-2010, 11:10 PM   #4
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If there is significant oil in there, it may have made its way to the idle control valve, so best clean it out. It's 100% normal for oil to be there, since the valve cover is vented directly to the throttle body.

I used a cable oiling clamp from a motorbike shop for my throttle cable and cruise cable. Basically you clamp the end, stick a can of lube on it (WD40, etc) and spray. The clamp causes the lube to be forced inside the cable and will come out the other end. Which makes a mess of the floor, fyi.

For stumbles on the E30, I'd check plug wires and vacuum leaks.
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Old 04-08-2010, 03:19 PM   #5
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If there is significant oil in there, it may have made its way to the idle control valve, so best clean it out. It's 100% normal for oil to be there, since the valve cover is vented directly to the throttle body.

I used a cable oiling clamp from a motorbike shop for my throttle cable and cruise cable. Basically you clamp the end, stick a can of lube on it (WD40, etc) and spray. The clamp causes the lube to be forced inside the cable and will come out the other end. Which makes a mess of the floor, fyi.
For stumbles on the E30, I'd check plug wires and vacuum leaks.

i dont quite understand the procedure you have described in bald... do you have a pic or a diagram or a link to a DIY?
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Old 04-08-2010, 03:31 PM   #6
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You use one of these:

http://www.motorcycle-superstore.com...ble-Luber.aspx
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Old 04-08-2010, 06:12 PM   #7
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ok good.. how do you adjust the throttle cable?
The throttle cable has a threaded fitting on the end of it at the throttle body (butterfly). Leave your door open, hood open, and use your right leg (while standing up) to tap the gas pedal... if there's lots of play, you will notice imediately at the throttle body... take the slack off the streched throttle cable by adjusting the threaded fitting until you can tap the gas pedal so that the throttle moves in sync with the gas pedal.
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Old 04-08-2010, 06:14 PM   #8
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You'll want the tiniest amount of play, like 1mm in the assembly to prevent strain on the cable.
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Old 04-14-2010, 11:20 AM   #9
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Okay. If you are getting excessive oil in the throttlebody from the top of the valve cover you have a problem with the tube that goes from the intake manifold to the oil pan. Most likely if you look there it will be wet from oil leakage. That tube going to the oil pan needs to be air-tight or the throttle body will end up sucking some of that oil in.

Check it out. I think there are 2 o rings, a washer and a spring you should change.
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Old 04-14-2010, 11:58 AM   #10
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Okay. If you are getting excessive oil in the throttlebody from the top of the valve cover you have a problem with the tube that goes from the intake manifold to the oil pan. Most likely if you look there it will be wet from oil leakage. That tube going to the oil pan needs to be air-tight or the throttle body will end up sucking some of that oil in.

Check it out. I think there are 2 o rings, a washer and a spring you should change.
Are you sure about that? That pipe is just a drain to allow oil back down into the bottom of the motor. If it allowed air in, the TB would just suck air rather than oil. It sucks more when its sealed with good o-rings, but it still doesn't suck up oil.

Maybe if it is clogged it might cause excessive oil in the TB housing, but I've never seen or heard of that being clogged.

Do you still have the coolant to TB lines installed? They are crucial to keep that area of the TB warm to stop the oil vapor from condensing; you'd get a lot more oil without those lines.
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Old 04-14-2010, 07:39 PM   #11
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Yes I'm sure. One time after doing a head gasket I reinstalled everything and all seemed fine. I was on a 16hr drive 2 days after when the car started running like crap.

I pulled over at a gas station and pulled the plugs, they were completely bridged with burnt oil!

I cleaned them out re-gaped and kept driving. Later I discovered that I left a few zip ties over that spring which tensions the tube and seals the o-rings. I released the spring and after had no further issues with oil in the throttle body.

A less severe leak would have a less severe oil problem. This is a sealed, pressurized system, a leak anywhere causes all kinds of crazy problems, it's not a simple drain tube. Think about it, the oil drain is coming from a pressurized intake manifold, if the pressure isn't sufficient to return it to the oil pan, it will end up going someplace else.
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Old 04-14-2010, 11:31 PM   #12
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Sorry dude, it might have seemed like that's what happened, but its not a "pressurized system". Mine is vented to atmosphere. Its purpose is to *remove* pressure from the crankcase (positive crankcase ventilation - PCV) and during vacuum conditions, it is under vacuum.

With a nasty leak at the pipe, you'd just have a nasty vacuum leak (with the factory PCV in place). If my pipe was missing it would just kick oil everywhere and run exactly the same as it did with the pipe in place.
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Old 04-15-2010, 12:12 AM   #13
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Okay. If you are getting excessive oil in the throttlebody from the top of the valve cover you have a problem with the tube that goes from the intake manifold to the oil pan. Most likely if you look there it will be wet from oil leakage. That tube going to the oil pan needs to be air-tight or the throttle body will end up sucking some of that oil in.

Check it out. I think there are 2 o rings, a washer and a spring you should change.
Im not sure there is enough sucking pressure to bring oil from the bottom of the engine to the top, especially when any excessive air needed could be available through the intake.

However there is a wire that connects to the oilpan, that wire is very stiff and apparently has alot to do with the way the car drives. I took a look at it and i managed to break the plastic shielding around the end, it seemed like coolant had made its way through there. I cleaned it and tried sealing it back. I think i might have to replace it. is that what you are talking about ?
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Old 04-15-2010, 12:42 AM   #14
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Well the pipe connects to the intake manifold. Take it off and I doubt the car would run very well if at all.

It's no coincidence that after sealing the tube properly that the oil issue was resolved, so this is my best suggestion.

I've done everything on the m20 that you can do, and I've had 5 engines. I've run the throttle body with and without the heater lines. The oil blow-by is not caused by not having the throttle body heater, in fact many cars don't even have that. Moisture in the throttle body will freeze the throttle open in cold weather, happened to me on the highway once.

Changing the o-rings on the tube and the spring will cost less than $20.

The hose from the top of the valve cover which goes to the throttle body is an emissions thing, re-inserts crank vapor into the intake for burning. Oil shouldn't be blowing through there, if it is sucking oil then the oil isn't being cycled back down that return tube properly.

To the OP I'd suggest asking a reputable BMW specific mechanic, with experience in these engines.
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Old 04-15-2010, 12:49 AM   #15
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Well the pipe connects to the intake manifold. Take it off and I doubt the car would run very well if at all.

It's no coincidence that after sealing the tube properly that the oil issue was resolved, so this is my best suggestion.

I've done everything on the m20 that you can do, and I've had 5 engines. I've run the throttle body with and without the heater lines. The oil blow-by is not caused by not having the throttle body heater, in fact many cars don't even have that. Moisture in the throttle body will freeze the throttle open in cold weather, happened to me on the highway once.

Changing the o-rings on the tube and the spring will cost less than $20.
Do u have a part number of the tubing or the O-rings just need to look up some diagrams. Or even the technical name of the tubing. Thank you
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