Trying to find VACUUM LEAK- Need advice

[535ise]

bmws and any openings such as the orings on the dipstick will create an unregulated vacum leak that will have an effect on the idle., In a case like yours where you have installed a mass airflow sensor instead of the afm I would guess that you're probably using a hotwire mass air flow sensor, if thats the case then if you check on most cars equipped with hotwire sensor they have the tube from the valve cover downstream of the mass air flow sensor, this is to keep any oil mist from contaminating that hot wire sensor... If it were mine I would move the sensor closer to the air filter and then connect the hose from the valve cover as far downstream as I could get it, maybe a couple of inches in front of the throttle body....

Thank's for that Bill. So the connection between the vacume leak and crank case leak is that it will change the level of vacume in the inlet manifold and will have a knock on affect as the fuel reg will be getting a false/wronge reading which affect's the A/F ratio on a standard set up ?

I thought the crank case was at a slight pressure rather than a vacume because of the blow past from the piston ring's ?

So i'd better change the oil more often to counter the blow by contaminant's ?

I'm useing a stand alone programable ECU that uses a throtle poteniometer(sp?) rather than an MAF or AFM.The ECU was mapped with the oil catch tank fitted and run's well but is the fuel reg going to be causing me any problem's ?

The inlet piping has changed a bit since the last picture.The standard elbow pipe from the air filter has been replaced with an 100 mm Samco elbow.The 75 mm black pipe has been replaced with a home made glass fiber pipe that start's at 100 mm to connect up to the new elbow and then taper's down to aproximatly 75 mm at the TB end.This has then been covered with foam pipe tape to hope fully insulate it from heat.

This was done to help improve the air flow from the air filter and into the TB.As you can see from the picture the wiring is still untidy and i've got to get two BIG hose clip's for the new elbow.



Sorry for rabiting on.

Thank's

Andy