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No sure indications IMO (archive)

[ Follow Ups ] [ 7-series (E32) Message Board ] [ Msg. Board FAQ ]

Posted by Kevin on August 10, 2001 at 11:05:50:

In Reply to: How to recognize V12 intake air leaks? posted by Henkka 750i on August 10, 2001 at 03:41:58:

From everything I've read on this board and my personal experience with 6 years of ownership of an M70, it's my opinion that the closed loop style control system and potential for various sensors in the control loop to be faulty makes it nearly impossible to create a simple go, no-go style checklist to fault the intake manifolds. I've seen and read about engines that had leaks that ran nearly perfectly for years... and others that barely ran at all with the same condition.

The one test that I have found to be the 'best' indicator of a problem is putting a vacuum gauge on the port on the DKs. If, at idle, you don't see 16 - 17 " of Hg vacuum, and you are already experiencing other symptoms like check engine light during warm up, rough idle at cold start etc. Then, there is a high liklihood that you have a vacuum leak in the intake somewhere - and the intake gaskets are the usual suspect.


Hi y'all!

I was wondering: since the M70 V-12 engines are known for their habit of creating air leaks at certain mileage, it would be very useful for all of us to know how to notice them.

Far as I know the engine was made to adapt to trouble such as minor wear and tear, air leaks etc. so I wonder if an engine could run seemingly well although it's leaking like a desperado after a shootout.


Does the engine idle differently?
Is there a lack of power at certain rpm?
Heat issues? (well they already run really hot don't they)
Can you actually hear it somehow?

Anyone having had air intake leaks fixed please post on how you found out that you were having this kind of problem.

For anyone wanting to fix the leaks, search the archives; there are million articles on this issue.

Thanks in advance,


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