BMW lots of vacuum

Rhubarb
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Posts: 7,012

BMW lots of vacuum Sept 8, 2015 18:39:14 GMT 1

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Post by Rhubarb on Sept 8, 2015 18:39:14 GMT 1

Hi all,

Had a E46 year 2001 318i(1.9) in for a misfire and running badly last week..

I replaced the coil pack(4) and plugs and one vacuum pipe.

Back in today, running unevenly at tickover, and sometimes needs throttle to start..

It drives well..

There's a breather cansister at the back of the engine that's whistling...You can remove and hold the oil cap approx 5mm away and it will suck it back on!

I've been right through the thing...

Suspected a crank breather under the inlet manifold but I can't find one!

Codes stored are for lambda(live data is good though) and cam sensor.

Any ideas before I burn it?

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BMW lots of vacuum Sept 8, 2015 21:06:48 GMT 1 Rhubarb likes this

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Post by Deleted on Sept 8, 2015 21:06:48 GMT 1

Sept 8, 2015 18:39:14 GMT 1 Rhubarb said:

Hi all,

Had a E46 year 2001 318i(1.9) in for a misfire and running badly last week..

I replaced the coil pack(4) and plugs and one vacuum pipe.

Back in today, running unevenly at tickover, and sometimes needs throttle to start..

It drives well..

There's a breather cansister at the back of the engine that's whistling...You can remove and hold the oil cap approx 5mm away and it will suck it back on!

I've been right through the thing...

Suspected a crank breather under the inlet manifold but I can't find one!

Codes stored are for lambda(live data is good though) and cam sensor.

Any ideas before I burn it?

It will burn well its running rich

Rhubarb Administrator Posts: 7,012	BMW lots of vacuum Sept 8, 2015 23:21:08 GMT 1 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by Rhubarb on Sept 8, 2015 23:21:08 GMT 1 Well after a lot of head scratching and googling methinks it's the Crankcase vent valve...

valhalla Mechanic "We will cross that bridge, when we have built it" Posts: 5,964	BMW lots of vacuum Sept 9, 2015 0:08:47 GMT 1 Rhubarb likes this Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by valhalla on Sept 9, 2015 0:08:47 GMT 1 If memory serves me at all, this is a common problem on this series of engines, and crankcase vent valve is the culprit.