More 5k CIS freq valve type questions (+ ECU q or two too)

[quk@isham-research.demon.co.uk (Phil Payne)]

In message <3.0.5.32.19980826181109.007e94e0@mail> Arryn Milne writes:

> So I pulled the ECU to check the connections, and what I would guess to be
> about 1-2 column cms of a viscous oily substance came out of pressure
> sensor line  (I guess what would amout to about 10-20 drops).  I'm pretty
> sure this isn't normal.  I don't really want to entirely disassemble the
> car, so does someone know where this line comes out on the other side of
> the firewall.

It usually leaves the rear of the inlet manifold and turns into a (yellow)
plastic line within a few inches.  You're right - it should be dry.
I can't imagine how liquid could get driven up it unless it's leaking
at the ECU end.  There's supposed to be a liquid trap not far from the ECU.

> BTW, from ECU pin 8 to the orange line on the freq valve shows about 10
> ohms, and the blue/black line from the freq valve to ground shows about 5
> ohms.  As both have items inbetween, I wasn't too surprised, but glad there
> was at least continuity.  My parts car had almost identical values which
> eased my pain a little.

ECU to frequency valve is resistive (deliberately).  This is why you
can't measure the duty cycle at the valve, and smog-equipped cars have
a test connector near the valve.

--
 Phil Payne
 Phone: 0385 302803   Fax: 01536 723021
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