Date:         Sun, 24 Dec 2000 18:18:59 +0000
Reply-To:     Mark Keller <kelphoto@ISLANDNET.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Mark Keller <kelphoto@ISLANDNET.COM>
Subject:      Re: Hard starting when warm
Comments: To: kenneth d lewis <kdlewis@juno.com>
Content-Type: text/plain; charset=us-ascii

Hi Kenneth,

It's a good question. I did the fuel pattern check, where you crank the
engine and watch for a concial spray pattern. The injectors do pulse
rapidly since the digijet/fant are not sqequential and All four
injectors pulse at the same time. The CPU recieves RPM information via
the distributor. When the key is to the run position before a start, the
fuel pump pressurizes the system but the injectors don't pulse. The
starter begins turning the motor, so I assume it's the distrubtor that
feeds the pulse to the ECU.

 As to the injection pulse at start up flooding the engine, I would
think that the ECU map has a base pulse lenth for the start-up sequence,
with perhaps the TEMP I , air temp sensor, giving some modification of
the cold start enrichment of the basic pulse map. If the temp I were bad
then perhaps a flooding event could occur.

Sincerely,

Mark Keller,
91 Carat
kenneth d lewis wrote:
>
> Mark;
>         Don't the injectors spray every time the pump runs at start up? I
> was wondering if it is possible to flood the engine?
>
> Drive Safely & Happy Holidays
> Ken Lewis    <Kernersville,NC>
> 86 VW crewcab;60 356B Coupe
> --------------------------------------------------
>
> On Sat, 23 Dec 2000 12:28:14 +0000 Mark Keller <kelphoto@ISLANDNET.COM>
> writes:
> >Hi Mike,
> >
> >An easy way to check the fuel pressue it to turn the key on and listen
> >for the fuel pump, when you hear it stop then turn the key off and
> >then
> >back on, listen for the fuel pump to stop again, do this two or three
> >times and then try to start the van.  If it starts easier, the problem
> >may be a a faulty check valve in eiter the fuel pump or the pressure
> >regulator.  pmail me for a futher discussion on where to go.
> >
> >Mark Keller
> >91 Carat
> >
> >"Michael E. Pidcoe" wrote:
> >>
> >> I would also suggest that if it is starting OK cold but then slow
> >after
> >> you drive and park then your charging system is not keeping the
> >battery
> >> up.  Either the battery is suspect (have it tested) or the charging
> >> system itself is the problem.
> >> Mike Pidcoe
> >>
> >> -------------------------- eGroups Sponsor
> >-------------------------~-~>
> >> Big News - eGroups is becoming Yahoo! Groups
> >> Click here for more details:
> >> http://click.egroups.com/1/10801/1/_/156147/_/977600568/
> >>
> >---------------------------------------------------------------------_->
> >>
> >> To leave this list send an 'empty' message to
> ><mailto:vanagon-unsubscribe@egroups.com>
>
> ________________________________________________________________
> GET INTERNET ACCESS FROM JUNO!
> Juno offers FREE or PREMIUM Internet access for less!
> Join Juno today!  For your FREE software, visit:
> http://dl.www.juno.com/get/tagj.