Bob, hate to say it, have you had any pinging lately? You don't think
it could be a slight leak in the intake manifold gasket do you?
GS -
TREMAIN LYNNE wrote:
>
> Bob
> You probably already checked it, but if not check your pcv valve. Stuck
> open it will draw oil through the pcv into the intake (especially if you
> have after market valve covers), stuck closed it can build up pressure
> in the crankcase and force oil past the rings on the intake stroke.
> Hopefully the solution is that simple
>
> Dave T.
> 99 solar Yellow CC 4x4
>
> Bob Tom wrote:
> >
> > Hi, everybody.
> >
> > Situation:
> > '97 Magnum 318 ... been losing oil lately ... no visible external leaks
> > ... no really tell-tale signs from the exhaust pipe (after sitting overnight,
> > on startup, will blow out a bit of soot and lots of moisture vapour ...
> > running headers) ... running a 180F tstat ... no loss in coolant ... low
> > mileage
> > ... weekend drag racing this season ... running 5W30 synthetic ... am
> > running rich
> > and switching back to stock tstat in this colder weather. I did a
> > compression test
> > and cyclinder 4 is off ... FSM says crank over 3 times and compression
> > pressure should
> > be 100 psi. Most of the loss comes after fairly brisk highway driving.
> >
> > Results are (bracketed are plug condition):
> >
> > 1 152 (wet: oil) 2 150 (dry: aok)
> > 3 150 (wet: oil) 4 130 (dry: aok)
> > 5 150 (black) 6 145 (wet then dried out: gas)
> > 7 145 (dry: aok) 8 150 (wet: oil)
> >
> > I'm running the MP Magnum R/T cam which may account for the high numbers.
> > Also, ran compressed air through cylinder 4 and listened through a rubber
> > hose ... did not detect sound of leakage. Also, put oil in cyclinder 4 and
> > did a compression re-read. Removed rad during compression testing and
> > no bubbles in the rad coolant.
> >
> > This leads me to conclude that rings are aok and maybe valve seals (or some
> > other valvetrain components) are the problem but I'm puzzled about cyclinder 4
> > compression reading. Any ideas at all? Thanks very much.
> >
> > Bob. Southern Ontario, Canada.
> > '97 Dakota CC Sport, FR, 5.2L, 3.55 SG, auto.
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