Posted by Frank Haas on August 04, 1999 at 19:43:52:
In Reply to: Smoking on the downhill posted by Mike Maier on August 03, 1999 at 11:27:01:
: I've got a 1981 528i...after climbing up a hill for about 10 miles I noticed on the way down a little smoking out the rear exhaust(especially after leveling out for a couple of miles. Back on the freeway everything seemed fine. Started it up the next morning and didn't see any smoke. Smoke was white in color. Any thoughts? (Valve job? Leak somewhere?)
My daily driver (Euro 528i w/3.5l engine 188 psi in all cylinders) smokes when driving down
steep hills. As I live on the top of a 1,400 ft bluff and commute daily
up and down, my car uses about 1qt every 350-500mi. At first I thought
bad valve seals right? Well that's no it. I seem to sucking into the intake
massive oil though the valve cover breather hose. Bad enough that it coats
the entire intake manifold runners with a nice oil film which
mostly burns off when I get over 5K rpm.
Funny on the flats even when letting off the throttle at high rpm (6500) --no smoke appears.
So why does my engine has this appetite for oil? Could it be the when the
throttle is closed the vacuum generated is high enough to pull quarts of oil out of the head?
Engine specs:
Euro 3.5l, stock cam --vg compression in all cylinders
SDS EM2-D injection running 4.0 bar fuel pressure
Throttle body overbored .100
Recently blueprinted injectors
Stahl headers
currently running mobil 1 15W-50 synthetic