Thanos,
I also believe that what you are referring to as the
"injection pump" is the control pressure regulator, or
cpr. The main fuel pump is nowhere near the engine.
In fact, its usually back near the fuel tank. Also, I
don't know if this particular Peugeot has an in-tank
transfer pump or not, but if it does, that could be
one of your problems. In systems with a transfer
pump, usually ones in which the fuel has to rise in
order to get out of the tank, failure will lead to
poor main pump performance and thus lowered fuel
pressure and all the problems that arise from that.
Regards,
Ben Pender
- Ben Pender <ben_pender@yahoo.com> wrote:
> Thanos,
>
> At what altitude are you? If you are less than
> 5000feet or 1600 meters, I wouldn't worry about it.
> Even if you are at that altitude or even slightly
> higher, it really shouldn't change things that much.
>
> The altitude corrector is there to increase control
> pressure which would have the effect of pushing down
> on the plunger in the fuel distributor and thereby
> lean out the mixture. If it failed, and you are at
> elevation, it could lead to an overly rich mixture.
> If it failed, and you are at a relatively low
> elevation, it would have very little effect. The
> point is, if it has failed, disconnecting it won't
> do
> anything.
>
> The altitude compensator, as mentioned above,
> manipulates the control pressure which pushes down
> the
> plunger in the fuel distributor. There is a sealed
> chamber in the base of the control pressure
> regulator
> (cpr), the thing on the engine block, that expands
> as
> atmospheric pressure drops. This then moves a
> diaphram in the cpr which allows more fuel, and thus
> pressure, to be directed to the top of the plunger
> in
> the fuel dist, which then pushes it down, reduces
> slit
> size, and reduces fuel flow to the injectors. If
> the
> expansion chamber in the cpr has ruptured, AND you
> are
> at significant elevation, your control pressure will
> be too low and you COULD get the symptoms you are
> reporting, although I doubt they would be as extreme
> as yours are.
>
> Regards,
> Ben Pender
> some MGs
> some VWs
> some Audis
> some Yugos
> and a Fiat X1/9
>
> --- Karydas <karydas@hol.gr> wrote:
>
> > Another thought that just occurred to me: There
> is
> > an "altitude
> > corrector" that is between the air filter pot and
> > the injection pump.
> > Could this be malfunctioning and calling for
> excess
> > fuel? Should I
> > bypass it and test again?
> >
> > Thanos
> >
> >
> > -----Original Message-----
> > From: peugeot-L@yahoogroups.com
> > [mailto:peugeot-L@yahoogroups.com] On
> > Behalf Of Ben Pender
> > Sent: Friday, July 15, 2005 7:29 AM
> > To: PeugeotGroup
> > Subject: Re: [Peugeot-L] 504 XN2 Super Rich
> mixture
> >
> > Thanos, Bob,
> >
> > He probably means 3 BAR (or atmospheres, or
> about
> > 46
> > psi). I'm not familiar with the specifics on the
> > K-jet system for the Pugs, but with similar
> vintage
> > VWs, the system pressure should be in the
> > neighborhood
> > of 60-70psi or about 4.5 bar.
> >
> > I would bet that the cold start injector, or the
> > "5th injector" is leaking profusely. And, if the
> > pressure really is on the very low side, then the
> > engine could be running on the csi only. Either
> > way,
> > the excessive fuel is washing the oil off the
> > cylinders which is why hot compression figures are
> > lower than cold. It also makes sense that the
> lower
> > pressures would be 3 and 4 as that is where the
> > majority of dribbled fuel would end up if the csi
> > were
> > leaking.
> >
> > I would make sure that the fuel pressure is
> where
> > it
> > should be. Certainly, with K-jet, the pressure
> > needs
> > to be much higher than 3 psi, if indeed, that was
> > not
> > a mis print. Most K-jet injectors won't
> (shouldn't)
> > even open at less than 55psi or better. However,
> > since the csi is an electrical injector very
> simialr
> > to a pulsed injector, it would spray fuel
> regardless
> > the pressure as long as it was electrically
> > triggered.
> > If it has a carb, and the spec is 1-2.5 and the
> > pressure is 3, it could be flooding the carb,
> which
> > would also cause these problems.
> >
> > Adjusting K-jet is easy. Between the fuel
> > distributor and where the air intake snorkely is
> > attached, there should be a small hole. Inside
> this
> > there is a small adjustment screw, usually a 3mm
> > allen
> > screw that is used to adjust CO. I would only
> mess
> > with this as a last resort when you are sure
> > everything else has been ruled out. The fact that
> > your fuel pressure data is funky is a sign that
> you
> > probably need to go back and reconfirm everything,
> > INCLUDING units! Units are very important, just
> ask
> > NASA, who had a major un-manned space probe
> mission
> > fail because someone did the calculations using
> > standard (English) units, while the rest of the
> > international partners used metric.
> >
> > Regards,
> > Ben Pender
> > some MGs
> > some VWs
> > some Audis
> > some Yugos
> > and a Fiat X1/9
> >
> > --- Bob Bruce <bobbruce@mts.net> wrote:
> >
> > > If your mechanic adjusted the valves using the
> "on
> > > the rock" method it will not work out.
> > > The valves must be adjusted according to the
> > factory
> > > method
> > > this method will be in any Peugeot shop manual
> or
> > I
> > > can explain it.
> > >
> > > The head should be retorqued every 30,000 KM
> > before
> > > the valves are adjusted
> > > if there is any question the head bolts should
> be
> > > pulled one at a time and all the threads
> > > on the bolts and in the block cleaned
> > >
> > > I am surprized at the fuel pressure, 3 psi is
> > about
> > > what the mechanical fuel
> > > pump delivers to the 504 with carbs. I would
> have
> > > thought the injected car with its
> > > electric pump would be higher.
> > >
> > > Bob
> > > ----- Original Message -----
> > > From: pkarydas
> > > To: peugeot-L@yahoogroups.com
> > > Sent: Thursday, July 14, 2005 1:03 PM
> > > Subject: [Peugeot-L] 504 XN2 Super Rich
> mixture
> > >
> > >
> > > Went to my mechanic with an intermittent
> > stalling
> > > problem on my 1973
> > > 504 injection. It felt like fuel starvation
> and
> > I
> > > suspected some
> > > sort of obstruction in the fuel line. He did
> a
> > > cold cylinder
> > > compression test which showed 125psi for
> > cylinders
> > > 1 and 4, and
> > > 120psi for 2 and 3. (I know the engine is
>
=== message truncated ===
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Received on Thu Jul 14 23:18:58 2005
