Re: [ihc] Scout warm up issues...

["Jim or Ginger Aos" <jaos@xxxxxxxxxxxxxxxxx>]

Greg, Thanks for the suggestion.  I do have a heat riser, and it seems to
work right.  I experienced that problem about 18 years ago, and this is
different.  It seems like the mixture is too rich in that intermediate time.
It's ideal at startup and when total warm.  In near or sub freezing temps.
it takes about 2 -3 miles to idle smooth.  Due to the electric choke, when
it is thoroughly warmed up, if I let it set for 10 minutes, the choke
engages and it starts a bit slow from eccess fuel. I don't know if that is
related.

Jim Aos

----- Original Message ----- 
From: "Greg Hermann" <bearbvd@domain.elided>
To: "Jim or Ginger Aos" <jaos@domain.elided>; "Ryan Moore"
<baradium@domain.elided>; "ihc-digest" <ihc@domain.elided>
Sent: Thursday, January 29, 2004 8:14 PM
Subject: Re: [ihc] Scout warm up issues...


> At 7:10 PM 1/29/04, Jim or Ginger Aos wrote:
> >----- Original Message -----
> >From: "Ryan Moore" <baradium@domain.elided>
> >To: "ihc-digest" <ihc@domain.elided>
> >Sent: Thursday, January 29, 2004 3:26 PM
> >Subject: [ihc] Scout warm up issues...
> >
> Does it have a heat riser valve between the right bank exhaust manifold
and
> head pipe ?? Is that valve working properly ??


>
> Greg
> >
> >> This last week I paid particular attention to the scout's warm up to
see
> >> exactly what it does when it gets to it's trouble spot.
> >>
> >> It always starts great and it'll run perfectly regardless of temp, I'd
> >> venture to guess I could kick off the choke immediately too and it'd be
> >fine
> >> at first.
> >>
> >> Here's what happens...
> >>
> >> It'll start great and be running along fine.  let it idle to warm up.
> >It's
> >> running fine.  Then the rpm drops a little. Takes a while before it
starts
> >> dropping but once it does it's fairly quick.  A slow and steady decline
in
> >> rpm until it bottoms out at around 400 or 500 rpm sounding like it's
only
> >> hitting on a few cylinders (I need to get a tach so I can verify the
> >rpms).
> >> It'll stay that way for a while, can't touch anything becuase kicking
off
> >> the fast idle will cause it to just die.  It'll do that for a few
minutes
> >> and then out of nowhere the idle will bump up a notch, not a whole lot,
> >just
> >> 50 rpms or so, it's a sudden surge.  After that though it starts the
same
> >> progression as initially except in reverse until it's at normal fast
idle.
> >> Then I can kick the fast idle off and go.   I can drive before then but
I
> >> have to be careful to keep some pedal in or it'll die (doesn't bother
me
> >too
> >> much, I like to let the scout warm up before driving anyway).  It does
> >kind
> >> of bother me though the way it does that.
> >>
> >> It runs really bad during that period.  Sitting there barely hitting,
> >whole
> >> scout shuddering and rocking a little as the engine hits along.  It's
> >going
> >> slow enough that I want to say I could easily count the number of loops
my
> >> alternator belt does while it's doing that (yeah a tach would really
help
> >on
> >> getting that RPM, I'm kind of curious how fast it's going).
> >>
> >> It's a pretty drastic difference.  Takes about 30 seconds I'd say to go
> >from
> >> initial great running to bad and another 30 seconds to get good again
> >after
> >> a few minutes of barely puttering along.  Also, it only does it when
it's
> >> cold.
> >>
> >> I've tried to mess with the choke some while it's doing that with no
> >> effect... any suggestions on what I should look at?
> >>
> >> New ignition module and coil and it did it with the old ones too (which
> >are
> >> now my spares).  Prestolite electronic ign and the infamous stock
holley
> >> 2bbl carb...
> >
> >My 4bbl Edelbrock (weber, carter),  with the electric choke does the
same.
> >My engine is a 392 IC.  I have felt that it is a problem with the ratio
of
> >enriching as it needs less and less in the warming process.  I am eager
to
> >hear from the experience of others.  Jim A.
> >
> >>
> >> It's been doing it for a long time, but it's one of those things that
kind
> >> of annoys me.... ok, it greatly annoys me, but I have no idea how to
> >> troubleshoot this one.  I don't remember seeing anything about this
type
> >of
> >> problem in the troubleshooting section of the service manual.
> >>
> >> Thanks,
> >> Ryan