Re: Does the 1988 750iL have PCV Valves? (archive)

David:
Yes their is something similar to a pvc valve on
the 750's, in fact two. I don't know what BMW's
name is for them, but I believe they serve the same purpose.
They are located under the eml motors on the front
end of the intakes. You will see a hose going to
the valve cover and one going to the hose from the
air cleaner to the eml's.
One test to make sure they are working is to take
off the oil filler cap and see if there is a vacuum, which I am told their should, per a BMW
mechanic. There are four valves total in the system, and replacement cost is about $100 for the
parts. Or you could try cleaning them with solvent. I believe the eml's have to be taken off
to get to the valves, however I have not done this
myself, but will in the next few months.
Good Luck
BobbyG

You should replace the rubber grommets that seat the valves to the valve covers as they are probably very brittle. You will need the following:
1ea 11151718642 valve for cyl\7-12 side $30.75
1ea 11151718713 valve for cyl\1-6 side $30.75
2ea 11151715844 gasket (called adaptors) $2.25
2ea 11611708475 gaskets for throttle mtr $2.10
2ea 11151720131 check valve $11.41
All of the prices are each and BMW list prices. Euarasian was much cheaper. The throttle motor gaskets are cheap insurance to have on in case you damage them when removing throttle motors. You might also consider replacing the 2 air boots for about $21 each. If they are original they will be very brittle.
Morty

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