Re: Is Dave Sontos still around?

[srubano@xxxx]

For hesitation problems, it may be one of the following:

1. Sticking or Binding air flow plate. If the airflow sensor plate 
binds on the way up, fuel flow will be limited and the engine will 
sag or stumble.

2. Sticking or binding Control plunger. If the control plunger binds 
on the way up, fuel flow will be limited and the engine will stumble 
or sag.

3. Incorrect System or Control pressure (you'll need a K-Jet gauge to 
measure this). If the system pressure is too high or if the control 
pressure is too high (high system pressure will usually cause a high 
control pressure) the movement of the control plunger will be limited 
and the engine will begin to run lean as the airflow increases.

OR

4. Unequal injector flow.

You can check 1,2 and 4 by removing ALL of the fuel injectors and 
placing them in a jar. Jump the RPM relay to turn on the fuel pump. 
Note the spray patterns on all of the injectors; they should be close 
if not equal. Next, with the air box removed carefully press down on 
the air meter flap and verify that there are no restrictions (should 
go all the way down). There should be a slight opposing force, that's 
the fuel pressure against the control plunger. It should go down 
smoothly and you should see more fuel (again close to if not equal 
amount) spraying from all of the injectors. The spray pattern should 
also be in a cone shape, should not be in a straight stream spraying 
out of one side. If it is spraying out like a straight stream then 
the injector is either dirty or bad.

In order to check 3 you'll need a Fuel pressure gauge for the Bosch K-
Jet system. That's the only accurate way to tell if the fuel pressure 
is too high in the system or if the Warm up regulator is bad.

Steve

--- In dmcnews@xxxx, Sacha Prins <sprins@xxxx> wrote:
> Hi,
> 
> I'm looking for Dave Sontos who sent me a URL once with directions 
to
> solve 'engine hesitation' problems:
> 
> > Hesitation, hard starting, backfire in engine, are all related to 
fuel
> > startvation problems in a cold engine. Visit my web page at
> > http://www.vabch.com/dsontos/Regulator.html for a full 
explination of
> > how to fix your problem.
> 
> Unfortunately the URL mentioned is not available anymore nor is 
Dave via
> his old e-mail address. Since I'm going to take my #17115 to the 
shop
> any time soon for a workover I'd like to have these directions to 
show
> the mechanic in the right direction.
> 
> Any info is appreciated,
> 
> Sacha
> #17115