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Old 03-03-2024, 03:14 PM
X5chemist X5chemist is offline
Join Date: Jun 2021
Location: Austin, TX
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Originally Posted by Scott ZHP View Post
Some less common air/vacuum leaks on the M54... one or sometimes two small vacuum caps on the rear of the intake manifold; they split and fall off. The tubing/vacuum valve that controls the secondary air pump is also back there. Dipstick o-ring where it enters the oil pan. The vacuum tube leading to the fuel filter/FPR splits; this leak will only be visible under the car. Any/all of the CCV hoses can crack.
For sure! Mine had two with real back cracks. I'm surprised it didn't set any codes.
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'06 X5 3.0i - bought @143,123 miles (12/26/20)
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