[DML] Re: PCV valve failure [was: Unprotected DeLorean Ignition Circuit]
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[DML] Re: PCV valve failure [was: Unprotected DeLorean Ignition Circuit]



Your mention of vacuum leaks reminds me of an anomaly in Farrar's
recent distributor fire that thus far has gone totally unanalyzed:

The vacuum line to Farrar's modulator valve is TOTALLY missing:
http://us.a2.yahoofs.com/groups/g_hr_1154320/f92d/__hr_/2a42.jpg?grwO_YIBNUrbGoBw
It isn't just damaged (none of his rubber is damaged in fact) -- the
entire hose is MIA.

The far end of that hose is adjacent to the transmission, BTW: Very
far from the distributor fire.

Was the hose somehow lost during fire extinguishing, or during the
subsequent tow home, or did its absence PRECEDE the meltdown/fire?

Vacuum leaks will do much more than just throw your idle off. They
cause cylinder temps to absolutely skyrocket. Look at what happened to
the spark plugs on the driver's side of my engine when the hard
plastic vacuum line to my HVAC cracked (I was still K-Jet at that time
-- HVAC was plumbed through the passenger intake rail, which fed
driver's side of the engine):
http://us.a2.yahoofs.com/groups/g_hr_1154320/af49/__hr_/3233.jpg?grwO_YIBjKp.pNSq
Notice the electrodes are melted completely away -- ceramic side too.

If Farrar lost his modulator vacuum line BEFORE the meltdown, what
would have been the effect to his engine?

Note also that Farrar only has one vacuum trunk line. PCV, HVAC, brake
booster, and modulator valve all feed off the same 3/8" barb. If he
lost that modulator line, none of the other systems would work
properly, PCV included.

Food for thought. This could be just another rabbit trail theory, or
it might be worth considering further.

Bill Robertson
#5939




>--- In dmcnews@xxxxxxxxxxxxxxx, "bitsyncmater" <david.mckeen@...> wrote:
>
> I think a PCV valve is not a check valve but a controlled volume 
> (like an orifice).  If you use to much vacuum flow you will never get 
> your idle speed down to 750 RPM. (Just like other vacuum leaks)
> 



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