You're not supposed to, but you can adjust control
pressure. There's a round, about a 1/2 inch recessed
"dowel or pin", black in color if I remember, that
you can tap down until you get the control pressure
you want. No one has mentioned that you need a
special set of fuel guages to check CIS pressures
which are not only high pressure, but also have two
hoses and a valve to open and close so that you can
check primary and control pressure. Primary pressure
on the Peugeot should be 80-90psi if I remember
correctly, and cold control pressure varies with
temperature(usually high 20's in normal weather)
and is around 50psi warm. You can also check exhaust
without a CO machine by putting a meter that reads
frequency on the wire that's loose behind the
windshield washer bottle on the driver's side of the
car(if my memory serves me) and adjust the CO with
that 3mm allen that was mentioned in another post
until the meter reads 56% (again I think that's
correct).Basically, you're using the system's own
feedback (the O2 sensor), to tell how accurate the
fuel mixture is by reading what signal is being
sent to the frequency valve. The frequency valve is
a pulsed return valve that changes pressure in the
lower chambers of the fuel distributor, thereby
altering pressure in the upper chambers which
changes
mixture strength. This is the Lambda Sond part of
K-Jetronic. Also, in checking this post I noticed
that I didn't remember to say that the "dowel or
pin" I mentioned is on the control pressure reg.
This is very nostalgic as it's been along time since
working on CIS which I always liked as it was simple
and clever, reliable as long as you kept your fuel
clean, had only two moving parts; but it wasn't
accurate enough to contend with ever tightening
emmision standards and CAFE standards.
Gary
- Karydas <karydas@hol.gr> wrote:
>
> What they measured was the pressure going into the
> injection pump. I
> think the manual calls for measuring it at the
> electrovalve.
> -----Original Message-----
> From: peugeot-L@yahoogroups.com
> [mailto:peugeot-L@yahoogroups.com] On
> Behalf Of Alex Zepeda
> Sent: Friday, July 15, 2005 10:47 AM
> To: peugeot-l@yahoogroups.com
> Subject: Fwd: [Peugeot-L] 504 XN2 Super Rich mixture
>
> Freaking list is set to reply off-list by default.
>
> ---------- Forwarded message ----------
> From: Alex Zepeda <alex.zepeda@gmail.com>
> Date: Jul 15, 2005 12:46 AM
> Subject: Re: [Peugeot-L] 504 XN2 Super Rich mixture
> To: Ben Pender <ben_pender@yahoo.com>
>
>
> On 7/14/05, Ben Pender <ben_pender@yahoo.com> wrote:
>
> > It also matters quite a bit where the pressure
> and
> > flow are measured.
>
> Yes. Keep in mind there are two critical pressures
> with K-Jet. The
> line pressure (to the injectors) and the control
> pressure (to the
> plungers).
>
> The control pressure should be (IIRC) significantly
> less than the line
> pressure, and it should vary depending on any number
> of conditions
> (depending on what the CPR is designed to react to).
> The line
> pressure should be stable, period. If it's not, the
> accumulator has
> probably failed. The control pressure can't really
> be adjusted (but
> the CPRs, especially the early ones, can be cleaned
> pretty easily).
> The line pressure can be adjusted with shims in the
> fuel distributor,
> but the main pumps do wear out, eventually.
>
> --
> alex
>
>
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Received on Fri Jul 15 08:34:11 2005
