RESUME: 100Q engine problems

[Denis]

The problem is the fuel regulator, i m quite sure. I m stuck here cause i
cant get parts around here for that old car.So the only way to get home is
towing or tricks the fuel pressure with a queezed hose on the return line to
up the system pressure.
Denis


> >
> > Car: Audi 100Q 1989
> > Engine: 2.3 NA CSI-3
> >
> > symptoms:
> >
> > - Hard starting hot and cold, starting as a big lazy cow.
> **** Nobody knows how a lazy cow starts . . .better to keep comments like
> that out since it does not add anything to clarify the problem.
> What are the symptoms? Long cranking times? Does it try to start on one or
> two cylinders and then dies (YES)? Does it cough and sputter(YES)?
> Did you check for a binding sensor plate in the fuel distributor?(NO)
> Are the plugs wet? (NOT ANYMORE,PRESSURE TO LOW.)
>
>
> > - Lower power; cant pass other car on the road. If i push the
accelerator
> more than the half the engine slow down instead of accelerate. I must let
> the engine take breath before push more on the accelerator. The sparkplugs
> look white and gray since the engine is going bad.
> **** White and grey? That sounds like a lean mixture.
>
>
> >
> > -Bad fuel economy
> >
> > -The piston swim in fuel if i miss the first start on cold weather.
> **** That means that the cold start valve is working. Maybe its always
on?(I CHECKED, NO)
> You would be running rich all the time, lousy mileage and hard starting.
>
> >
> > -Now the car is stalled 350km form home at -25C
> >
> > I did:
> >
> > -Installed a check engine light:Very useful.
> >
> > -I Retrivied the fault codes: knock sensor only ; cleaned the sensor
> connector, was oxidated.
> >
> > -Reset the fault code and check for others . None since i fixed the
knock
> sensor.
> >
> > -Did output check with the check engine light;everythings ok.
> >
> > -I changed the DPR connector and cleaned it, since that day the car ran
> powerful and good fuel economy for 2 weeks,,,, then back to a big lazy
> car...
> **** Car should run with DPR disconnected. This is the limp home mode.
> Starting may be difficult with DPR disconnected.
>
> >
> > -The fuel pump is 1 years old, i did not check the delivery rate.
> (Pressure dropped to 4.3.)I took the fuel pump from my ex-5000TQ 87 and
was
> running very good before i removed. I should have took all the inject
system
> from that car :-(.
> >
> > -Checked the fuel filter on the fuel pump;ok
> >
> > -Checked fuel lines:ok;They all been changed last summer 2004.
> >
> > -Changed fuel filter close to the fuel distributor.
> >
> > -Checked fuel system pressure;4.5 bar and 67 psi with another meter.
> System pressure drop immediately to 20psi when the engine stop. The
pressure
> then drop slowly to 5 psi and stay there for maybe 1/2 hour.
> **** Stay with PSI standards, Americans arent familiar with "bar"
readings.(OK)
> You defnitely have a problem in this area. System pressure should be 90
PSI.(I M SURE THE ONLY PROBLEM IS THE REGULATOR.IT GOT WORST THIS WEEK AND I
HAVE MORE PROBLEMS,NO I M STALLED)
> And, it should not drop off so quickly. You should have minimum 40 PSI
after
> 10 minutes.(OK)
> Low pressure is either fuel pump or pressure regulator.
> Pressure drop off is either fuel pump check valve or pressure regulator.
> Cold start valve could be leaking.(I LL CHECK IT)
>
>
>
> >
> > -Just changed sparkplugs
> >
> > -Try other sparkplugs wires;Beru. Checked on the dark if i can see any
> sparks come out the wires and distr. cap.
> >
> > -Checked the vacuum: 9psi. suppose to be around 20. The only leak i
found
> is one injector insert.
> **** Whats this? What vacuum? Vacuum when engine is running(YES WHEN I
COULD MAKE IT RUN)?
> Is this what you mean by a vacuum leak? Extra air coming into the engine
> thru a broken hose?(YES)
> How are you testing for this? Vacuum readings are in inches nor PSI.(MY
METER HAS MORE UNITS BUT I LL VERIFY)
>
>
> >
> > -I removed all the injectors and clean around, put silicon around them
and
> putted them back. The stores were closed that time, it s why i did that.
> >
> > -Removed the DPR and cleaned it.
> >
> > -Just changed oil :castrol synthec 5W30. Cause the car was swimming is
> fuel;after lot of starts and wet cylinders
> >
> >
> > -Checked the current on the DPR. Bentley procedure.:ok.
> >
> > -Checked the ISV with 12v charger:ok. But when i plug the wires to the
ISV
> the 12 V drop to 0volts
> ***** Huh?
> You test the ISV with a 9 volt battery.
> Explain about the 12 volts dropping to zero. What 12 volts? What are you
> doing?(I PLUGGED A VOLTMETER ON THE ISV PLUG, THE I PLUGGED IT TO THE ISV,
THE VOLTAGE DROPPED TO 0V)I USED AN HARNESS TO DO IT.
>
>
> >
> > Note: The engine seems to start when someone start while i push the
distr
> plate with my hand !!!!
> **** I mentioned before about a sticking sensor plate. Make sure its clean
> and free to move.
> Push or pull? PUSH FROM THE AIR FILTER.
> Are you trying to start the car with the air bonnet off?YES ALWAYS WHEN IT
DID NOT WANT TO START.
>
>
>
> SJ
> 85 Dodge PU, D-250, 318, auto
> 85 Audi 4k - - sold but still on the road
> 88 Audi 5kq
> 90 Audi 100q
>
>
>
>
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