[DMCForum] Re: Better, Stronger, Faster

["cruznmd" <racuti1@xxxxxxxxxxxx>]

The plunger in the fuel distro didn't rust shut, the entire Primary 
Pressure regulator froze in the barrel. No fuel could return to the 
tank. The Primary pressure regulator opens at a set pressure allowing 
excess fuel to go back to the tank.

I may be wrong about why the injectors are weeping but I know I'm 
right about the rest of it.

If you find info on the test kit let me know. Thanks,

Rich

--- In DMCForum@xxxxxxxxxxxxxxx, Jim Strickland <ihaveanaccount@xxxx> 
wrote:
> What?  What on the PPR rusted shut?  I thought you said it was the
> plunger.  This would cause a no-pressure condition, not a high 
pressure
> condition.  Are you saying that the return line in the PPR rusted 
shut? 
> You should also check the frequency valve to make sure that it is 
buzzing
> at it's correct duty cycle (70%, i think).  It's JOB is to stop 
fuel flow
> back to the tank, and I haven't heard you mention it yet (though 
I'm not
> very attentive either).  
> 
> Like I said you need to check your main and control pressure.  I 
bought
> the test kit from JC WHITNEY but I'll be damned if I can find it on 
their
> site now.  Maybe that's worth a phone call.  Good luck looking for
> converters.  I've spent days in fastener stores trying to get what I
> need.  Just recently I ended up getting my machinist to make a 
connector
> from scratch because it didn't exist anywhere else.  
> 
> I don't see why low pressure would cause the injectors to stream.  I
> would think that it just wouldn't open the injector.  
> 
> Jim
> 
> How do you 'ride' a submarine exactly?  Like slim pickins?
> 
> 
> On Thu, 17 Jul 2003 13:41:08 -0000 "cruznmd" <racuti1@xxxx>
> writes:
> > Incorrect control pressure can can cause a rich condition, but my 
CPR 
> > 
> > is brand-new, and I've checked the power supply for the heater 
> > element. 
> > 
> > You have to have high enough Main Line Pressure to overcome the 
> > spring-loaded valve in the injectors. 5.0 bars or so. If the 
> > injectors aren't open, then what the plunger does, and the 
control 
> > pressure on it is irrelevent. This should occur immediately upon 
> > cranking when the fuel pump energizes. You're already partway 
there 
> > because the accumulator maintains a rest pressure to prevent 
vapor 
> > lock.
> > 
> > My Primary Pressure Regulator (PPR) originally was rusted shut. 
The 
> > injectors REALLY chattered then because there was an overpressure 
> > condition. No fuel could circulate back to the tank. A lot of 
fuel 
> > ended up in the oil pan.
> > 
> > I'm using a Hayne's fuel injection manual that deals specifically 
> > with the K-jetronic and Cohee's Volvo manual and they both 
support 
> > this.
> > 
> > I've found a pressure gauge but I can't find the 3-way tee and 
> > fittings of the proper size.
> > 
> > As far as injector cleaning, some shops have the equipment to 
hold 
> > open the injector valve while backflushing a cleaner through it 
to 
> > clear out the little screen inside. Some use an ultra-sonic sink. 
We 
> > 
> > had these on the submarines I rode. Very cool.
> > 
> > 
> > 
> > --- In DMCForum@xxxxxxxxxxxxxxx, Jim Strickland 
> > <ihaveanaccount@xxxx> 
> > wrote:
> > > "primary pressure regulator opens too soon preventing pressure 
> > from
> > > building?"  what does that mean?  Since the Injection system is
> > > continuous (eg, CIS), then the injectors do not "wait" for 
> > anything 
> > to
> > > happen, so injector timing is irrelavent.  The only thing that 
> > controls
> > > how much gas gets into the engine (under normal running 
> > circumstances) is
> > > the fuel pressure and the plunger position.  If you think your 
> > pressure
> > > is too low, you should check the control pressure regulator as 
it
> > > "counteracts" the primary pressure.  You might also have a fuel 
> > pump
> > > issue, but this is less likely.  You can get a fuel pressure 
guage 
> > 
> > and
> > > all the plumbing to test the primary and control pressure for 
$50-
> > $70.  
> > > 
> > > Streaming is usually the sign of a dirty injector.  I don't 
know 
> > how
> > > you'd clean one though..?  I just bought a new set when the car 
> > was
> > > running like S.  
> > > 
> > > Jim
> > > 
> > > 
> > > 
> > > On Thu, 17 Jul 2003 01:44:55 -0000 "cruznmd" <racuti1@xxxx>
> > > writes:
> > > > New starter showed up today. 
> > > > 
> > > > Fast as fast can be, you'll never catch me! What a 
difference. 
> > With 
> > > > some actual speed, it was able to circulate the little bit of 
> > oil 
> > I 
> > > > put in the cylinders to pre-lube them and that squeal I had 
shut 
> > 
> > > > right up on the 2nd revolution.
> > > > 
> > > > I have decided I can't screw up my fuel distributor any worse 
so 
> > 
> > I 
> > > > cleaned it up w/acetone & put the mix control unit back 
> > together. 
> > > > The 
> > > > airflow sensor doesn't bind anymore, and the metering plunger 
> > moves 
> > > > much more freely, but I still don't think it's quite right. 
Some 
> > 
> > > > more 
> > > > reading also leads me to believe that the primary pressure 
> > regulator 
> > > > 
> > > > opens too soon, preventing enough pressure from building to 
> > fully 
> > > > open the injectors. Combined with a sticking plunger, they 
just 
> > > > drizzled, and never shut off until the pressure bled off.
> > > 
> > > 
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