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

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

----- 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...


> 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