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

["Steven Stegmann" <steve.stegmann@xxxxxxxxxxxxx>]

Ryan,

Mine does something similar.  But in my case I have Holley EFI and the
problem is the oxygen sensor coming online when the coolant hits 75 deg F.
So I just bump up the fuel until the cooland hits 130 and everything is
fine.

Steve

-----Original Message-----
From: owner-ihc@domain.elided [mailto:owner-ihc@domain.elided]On Behalf Of
Ryan Moore
Sent: Thursday, January 29, 2004 5:26 PM
To: ihc-digest
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...

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