Model A backfiring and will not go

[thomas....@yahoo.com]

Hi,
Yet again I am looking for some advice, dont have my Model A long.
when i bought it the car wasnt going well because it was taking in air
at the inlet manifold. I got new gaskets and properly got that sorted
out.
The problem now is that, car is sitting taking over well but once you
go to put it in gear or go to make the engine work or give it high
rev. the car will then start banging and backfiring through the
carbrettor.
I have worked on trying to fix it for the last 2 weeks solid but
nothing seems to be working.
I have had several people look at her and they all came out with
different things but non so far has worked.
I have changed the garkets on the inlet and outlets, gaskets from carb
to the manifold, gaskets in the carbrettor. New points, plugs, coil,
condenser. Still no difference.
I have a feeling it might be something small but none of seem to be
able to pin point anything.

Please, any advice or information you could give us would be greatly
appericated.
Thanks a Million,
Thomas Morgan

[erics...@gforcecable.com]

I know how frustrating this can be. And what may compound
things is, as is common with a new Model A, there may be
more than one problem going on here. So it may take
multiple little fixes. But we'll get you there.

That being said, it could be that its starved for fuel.
With a cool engine and the shut off valve closed
disconnect the fuel line from the carburator and standby
with a container to catch the gas. Open the fuel line.
If everything is correct you should get a continuous
steady stream of gas that arches out from the end of the
line a good couple of inches. If it starts fine and then
dribbles or even decreases that's your problem. The most
common cause is corrosion products in the gas take
plugging either at the tank outlet or even in the
carburator jets. To see if its at the tank outlet or
anywhere in the line get a 3 or 4 ft section of clear
rubber tubing that will fit over the ferral that screws
into the carburator. I believe that's 3/8" ID. With the
shut off closed place the tubing on the line holding the
end above the top of the fuel tank. Open the shut off
valve and blow into the tubing until you can hear bubbles
in the gas tank. Close the shut off valve and reperform
the flow test as before.

If the flow test is now successful you will want to get a
stand filter that goes in the end of the shutoff valve
and rises into the gas tank. For GP you should also take
the carburator apart and blow out the jets incase there is
any debris in there.

If the flow test was ok the first time around you still
could have "chunky fuel" as friend likes to call it and
some debris in your jets. If you have compressed air you
might want to try blowing out all the carburator passages
too and then shooting them with some carburator cleaner.

Button it back up and make sure your choke rod is at least
1/4 turn open and give it whirl.

I hope that helps,

Eric Shogren
Shade Tree As


On Mon, 2 Jul 2012 16:30:09 -0700 (PDT)
"thomas....@yahoo.com" <thomas....@yahoo.com>
wrote:

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[Shogren, Eric]

Jim McPherson passed this along that may also be cause:

"From the description, I immediately thought of the condenser, but that
has already been replaced. If it is not a fuel problem, and if the car
has been sitting for any time, he may have a stuck valve. He never said
the car ran well at any time."

I hope this helps,

Eric Shogren
Shade Tree As

[Don Turley]

Improper timing can also cause backfiring. Here is a link on how to
properly set the timing.

Timing: http://www.abarnyard.com/workshop/timing.htm

Marco's web site: http://www.abarnyard.com/


Don Turley
www.donturley.com

-----Original Message-----
From: modelaf...@googlegroups.com
[mailto:modelaf...@googlegroups.com] On Behalf Of
thomas....@yahoo.com
Sent: Monday, July 02, 2012 7:30 PM
To: Model A Ford Forum
Subject: [ModelAFordForum:468] Model A backfiring and will not go

[Lockwood, Fred C]

Tom
You have had several good replies with thing to try. A good start is attitude of mind! A Model A is not rocket science, you can fix it. But there are a lot of amateur mechanics out there, enthusiastic owners who can talk the talk, but who are not good mechanics. Consult a good car mechanic.

On first reading, it sounds like fuel starvation to me. Borrow a carb and swap. Someone has mentioned the possibility of a valve stuck open. I can't remember on a Model A, I drove them in the fifties (still in my blood), but on some side valved engines you can just see the valves through the spark plug hole. And/or due a compression test. Ignition timing correct? Cam gear properly timed. Stick the end of a length of tubing in the carb intake, introduce a small amount of gas (teaspoon) into the other end and get an assistant to trying reving the engine. If it picks up momentarily you've got fuel starvation. Be careful to keep clear.
Fred




________________________________________
From: modelaf...@googlegroups.com [modelaf...@googlegroups.com] on behalf of thomas....@yahoo.com [thomas....@yahoo.com]
Sent: 03 July 2012 00:30

To: Model A Ford Forum
Subject: [ModelAFordForum:468] Model A backfiring and will not go