75 Dodge 1 Ton problem

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clannorm@yahoo.com - 05 Oct 2006 12:03 GMT

I've got this falling apart RV. The problem is when I start it it
won't drive untill it has warmed up for 10 minutes. It idles fine and I
can give it gas and its fine but if I put it in gear it dies. If I put
it in gear and give it no gas and its warm enough it will maybe start
to move but the slightest bit of pressure to the gas peddle and it
dies.
This was even worse in the winter when this was the only thing I had
to drive to work for a week. It wouldn't run right till it had been 15
minutes warming up and I live in Arkansas where winter mornings are
usually around 40 so not real cold.
I don't have a book. There is some sort of vacume device with a line
running to some sort of big diafram with a linkage to the carb. this
appears to not be working.
Ken

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Scott Hendryx - 05 Oct 2006 12:37 GMT

> I've got this falling apart RV. The problem is when I start it it
> won't drive untill it has warmed up for 10 minutes. It idles fine and I
[quoted text clipped - 10 lines]
> appears to not be working.
> Ken

Had the same problem several times with my 1971 Dodge Brougham RV. I
changed the transmission fluid and filter to fix the problem. Mine sits at
the deer lease and I rarely move it. You can have mine for parts if you
want to come to Texas to get it.

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--Scott Hendryx--

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Budd Cochran - 05 Oct 2006 12:46 GMT

How long has it been sitting?

Usually, a failure to drive away from cold is a choke adjustment problem.

The device hooked to your carb linkage may be a cruise control diaphragm.

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Budd Cochran

John 3:16-17, Ephesians 2:8-9, Romans 3:23, 6:23

"Our Constitution was made only for a moral and religious people.
It is wholly inadequate for the government of any other."
(John Adams)

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Jon - 05 Oct 2006 17:40 GMT

Ken,

If you're still having trouble when it's warm, then I'm willing to bet
you've got a vacuum leak, a failed or misadjusted accelerator pump, or
your carburetor has gummed up. Narrowing down potential vacuum leaks
one by one is easy enough -- get a good manual if you need to know what
and when certain components get vacuum.

You should then check to make sure that AS SOON as you move the
throttle linkage, a healthy squirt is provided from the accelerator
pump. A late reaction might be cured by making sure the linkage is
adjusted properly -- no squirt and you need a rebuild.

If you've got a 2bbl Holley on it (OE 2210?), and you have both a good
accelerator pump squirt and healthy vacuum, then it suggests that the
transfer ports on the base plate aren't being supplied with enough fuel
to do their job. I often run across circumstances on older commercial
trucks where if they don't move much, the base plate gets just enough
gum and corrosion in it to let it idle but have a hell of a time
getting off idle. This isn't a spray-can carburetor cleaner job -- it
needs to sit in a dedicated bucket of the stuff and have a thorough
rebuild.

Maybe one step closer? Maybe someone's lousy armchair diagnosis?

...

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clannorm@yahoo.com - 05 Oct 2006 20:33 GMT

How long has it been sitting?

Usually, a failure to drive away from cold is a choke adjustment
problem.

The device hooked to your carb linkage may be a cruise control
diaphragm.

It sat at least a year before I got it and then sat for another year
with maybe 50 miles on it. It is worse than it was when I got it. My
brother thought that "device" was maybe connected to the air
conditioner. I'll track it down

We've got a vacume pump I can pt on it and listen to the sucking. I'm
also going to rebuild the carb. Anyway thanks to all ya for the help
Ken

> Ken,
>
[quoted text clipped - 37 lines]
> > appears to not be working.
> > Ken

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John Kunkel - 05 Oct 2006 19:11 GMT

> I've got this falling apart RV. The problem is when I start it it
> won't drive untill it has warmed up for 10 minutes. It idles fine and I
> can give it gas and its fine but if I put it in gear it dies. If I put
> it in gear and give it no gas and its warm enough it will maybe start
> to move but the slightest bit of pressure to the gas peddle and it
> dies.

What size engine? If it's a 318 or 360 the crossover passage in the intake
manifold is notorious for plugging solid with carbon, this doesn't allow
heat to the carburetor which makes for a long warmup period.

> I don't have a book. There is some sort of vacume device with a line
> running to some sort of big diafram with a linkage to the carb. this
> appears to not be working.

Probably cruise control.

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Paddy O'Day - 07 Oct 2006 00:52 GMT

This is a common problem with old carbureted mopars.

You probably have a worn out carburetor. Rebuilding it will not fix the
problem. If you really want to keep it, and I can't imagine why, you
will have to buy a new or nearly new carburetor.

JAM

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Budd Cochran - 07 Oct 2006 01:06 GMT

Bullfeathers!

I've rebuilt many carbs and some of them several times and had them work
just like new. In one case, a carb from Carburetor Exchange in Indianapolis
required rebuilding to fix THEIR mistakes.

Of course, you also have to be smarter than the carburetor . . . .

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>> I've got this falling apart RV. The problem is when I start it it
>> won't drive untill it has warmed up for 10 minutes. It idles fine and I
[quoted text clipped - 18 lines]
>
> JAM

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