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Vacuum leak through valve cover possible?

Pablo M
Go to solution Solved by Son of Marty,

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So many of you know my trials and tribulations in getting my 1972 2002tii running. I seem nearly there but still fighting suspected vacuum leaks as my idle still surges and is too high (~2000rpm ish). While researching DIY smoke testers one discovered they had a vacuum leak at the oil filler (newer BMW). 

Got me thinking, because when I put my valve cover back on I did take note it was warped compare to the head. It did not sit flat, with possibly 3-5mm of wobble  between corners. I just figured the nuts would solve that and they went on in proper sequence, torqued down. 

Could this be a be a contributing factor? I guess now more than ever I need to sort out a smoke tester…

2003 e39 M5 (daily)

1986 e30 325es (sons car)

1972 2002tii (fun daily alternative)

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....The only way this might happen would be if the crankcase breather connection on the cam cover was connected to the plenum instead of the air cleaner.... Seems unlikely.

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'59 Morris Minor, '67 Triumph TR4A, '68 Silver Shadow, '72 2002tii, '73 Jaguar E-Type,

'73 2002tii w/Alpina mods , '74 2002turbo, '85 Alfa Spider, '03 Lotus Elise

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