type44 rough start and rough idle when cold.. CO off? any

[SJ]

From: <JordanVw at aol.com>
>
>
> > Is this an intermittant problem? Does the car ever start ok? Under what
> > conditions?
> > Vacuum leak that closes after a warmup?
> > Have you checked your plugs?  Lean or rich mixture?
> >
> > Try spraying starter fluid thru one of those bonnet yellow plugged
nipples
> > while the engine is running rough. If it clears up, then its a fuel
related
> > issue.
> >
>
> its not intermittant, it starts like this all the time when car sits for a
> period of over 5  hours or so..  basically it does this every morning
weather
> its minus 10 out or 100 degrees out.    but it doesnt do it when the
engine is
> warm.
**** Aha! Now we are getting some good symptoms.
1. Normal operation when engine is warm.
We can eliminate most vacuum leaks
Difference between cold and warm operation is the cold start injector, and
the temp sensor that tells computer how to adjust fuel mixture for various
temps.

2. Test the cold start valve for proper operation.
Injector gets 12 volts on startup, which opens the injector during engine
start. This is your "choke".
Do you have the Bentley manual? The manual will tell you how many seconds of
spray vs ambient temperature.

3. Define the symptoms again for a morning start?
a. Long crank times?
b. Sounds like it tries to start?  One or two cylinders try to fire?
c. a + b, and then it starts up, but idles real rough, you have to keep idle
at high RPM otherwise it dies?
d. c, and after warm up the engine idles fine and you have no more problems?
c. Does it start right up, and after a few seconds it dies, wont idle?

4. Has the engine ever run right? How long have you had these symptoms?

>
> what "bonnet yellow plugged nipples" are you talking about?   vacuum line
> plugs?
****Right!
The "bonnet"( big rubber hose gizmo that connects fuel distributor to the
throttle body at the intake manifold) is the name in the family album for
this molded rubber hose/gizmo.
The yellow plugs in the bonnet plug off various vacuum "bosses" that are not
used in your model.
These "bosses" are convenient places where you can spray in starter fluid,
or connect a hose from a propane tank.

Your problem sounds like a fuel mixture problem when cold. Most likely
failure is the temperature sensor that tells the computer how to adjust the
fuel mixture. The sensor is "set"(broken at) to warm and thats what the
computer sees all the time. When the engine is already warmed up, this is
not a problem. When the engine is cold, the computer is setting the fuel
mixture for a warm engine and this mix is too lean to properly start and
idle.

Another area that will give you similar problems is the system fuel
pressure. Not enough pressure equals not enough fuel in the mixture - you
are running lean. Engine will run when warmed up, but starting with this
lean mixture is a bitch.
We just diagnosed Denis's problems down to the fuel pressure regulator. Some
dork monkey lad prior to Denis buying the car had replaced the fuel pressure
regulator with the wrong part number - 60 PSI instead of 90 PSI. The car
started and ran, but marginally.

But, lets get you to define the symptoms in more detail - see 3. above.  It
will narrow down the possibilities.

SJ