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

[bearbvd@xxxxxxxxxxxxxx (Greg Hermann)]

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