BMW Forums : BimmerForums banner

1 - 4 of 4 Posts

·
Registered
Joined
·
2 Posts
Discussion Starter #1
Having recently acquired a 540i Touring I am trying to track down an air leak on the intake.


The symptoms are :

Misfire - very noticeable around 1200 RPM +

If I stab the throttle whilst the car is idling - it almost stalls before picking up

Very obvious sucking noise which appears to come from under the inlet manifold on top of the engine



Car has 122000 miles - new short engine at 41000


I realise this could be quite a tricky problem to trace - just wanted to see if there were any common failures to check first.


Any thoughts?
 

·
Registered
Joined
·
2 Posts
Discussion Starter #3
Thanks Ronnie,


Does the vent pipe run under the intake manifold?

Unless that non return valve on the seperator has failed it looks like I will have to pull the inlet manifold off to find the problem.
 

·
Registered
Joined
·
20,393 Posts
The vent pipe does yes. :thumbsup

Have you tried spraying some carb cleaner carefully around the pipes and joints and seeing if the engine note changes?
 
1 - 4 of 4 Posts
Top