Re: Cold start problem...

[i6941tb@gnn.com]

Nathan Belo wrote:
> 
> On Mon, 25 Nov 1996 i6941tb@gnn.com wrote:
> 
> > Yes, Liju, I know exactly what that is (BTDT). Replace the injectors
> > with the new ones, Viton tipped.
> >
> > When you run your car the pump deliveres fuel @80psi. When you shut it
> > off, the pump stops and injectors bleed the pressure down to about
> > ~50psi, then shut themselves hermetically. This is done in order to keep
> > the residual pressure in the fuel sys and to allow you a quick start
> > later.
> >
> > Your old injectors have lost this ability and in the morning you are
> > pumping up those 80psi from 0. Have you ever happen to run out of gas
> > dry and then try to start the car after AAA refilled your tank? Same
> > here. That is why you have no problems restarting the car after 45min.
> > The pressure is still fairly high, the injectors drip relatively slow.
> >
> > Get new injectors and enjoy the 2sec cranking time all year round. (OK,
> > make it 5sec in the winter, if you have fresh plugs).
> >
> > Igor
> >
> I have the same problem, but I've been told it is most likely the cold
> start valve or possibly thermo-time switch.  My car has 149,000 miles.  It
> always start after a few turns on the ignition, which is embarassing.  My
> friends say to me, "Audi."  I replaced the ignition switch, but it didn't
> help.  How do I know.  I don't have a multi-meter yet and if I want to
> take the cold start valve off to see if it spews gas for 8 seconds,
> because it is a pain in the butt to get to on my car.  If it is the
> injectors there is a company in the back of European Car that sells these
> high performance, blue printed, blah, blah, blah injectors.  Should I get
> these?  In the morning when I turn the ignition it will bo vroom for a
> second and then I have to keep on turning the ignition until it starts.  i
> don't hold the key on for fear of frying my ignition.  Help!!!


Nathan, there's a very simple way to check the injectors (short of
pulling them out one by one and observing them drip, which I have done
also, BTW):

Next morning crank the car until it starts (note the cranking time).
When it starts, shut it off immediately. The engine will still be cold
and you will be able to rule the cold start valve/temp sensors out.
Now crank the car again. Did it start immediately? If yes - get the new
injectors. BTDT.

BTW, since it's a typical problem, AoA even issued a repair bulletin:

No. 25-89-TO2 "Engine-Excessive cranking time" 5000Turbo, 200 All
160hp(MC) M.Y. 1986-89:

Cause: Loss of residual pressure through seeping fuel injector nozzle.

Production: Introduction of "Viton" seat in injector assembly.
As of November 1988 VIN: 44_KN038262

Service: Replace all 5 injectors with new "Viton" injector, P/N 035 133
551F.

Igor