wondering what the knocking noise is at start up on these 2 740il 4.4/m62

[krazybud]

Hi Ya wayne,Im still wondering what the knocking noise is at start up on these 2 740il 4.4/m62,1 has 121,000 miles. and the other 170,000..they both do it hot r cold and not all the time,thats what gets me. i just bought all my parts form Pelican for replacing the chain guilds and everything else that i need to do it in the high mileage 1,any ideas?..could it be the vanos solinoids,or maybe losing oil pressure on the tensioner? any help would be fansatic... i been an auto tect over 30 yrs.andi drove 1of these 740 about 5 years ago and and to get 2, ofcourse my wife needed 1 .i also bought the bmw gti scanner good to 2006,i think they went to fiber optic in 07......looking forewards to your input,and keep up the awesome job bud....thankz



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This post was auto-generated based upon a question asked on our tech article page here: Pelican Technical Article: BMW Camshaft Timing and Vanos Unit Installation

[Nick at Pelican Parts]

The noise could be your VANOS units. If worse when cold and accompanied by a rough idle, suspect the VANOS units.

- Nick