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Old 12-04-2005, 02:01   #1 (permalink)
DeVere W
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1984 4.9L problem. Help??

1984 F150 with the inline 6. 4sp w/granny.
I thought the fuel line was freezing going to work Thursday morning.
The truck was cutting out bad and I was losing speed. Down shifted and
it just kept getting worse. I switched tanks and it didn't help. I made
it to work in granny. Chugging pretty bad. After work I filled up with
gas and put in some fuel line antifreeze. After about ten miles at 65mph
it started doing it again. I was a couple of miles from home and made it
doing about 45mph with the truck still cutting out bad. In the driveway
the truck ran ok at idle. I could rev the engine and it ran fine. I took
it back out on the road and it started doing it again.
So, I put in a new fuel filter at the carb, along with some new spark
plugs and air filter, and tried it again. This time it ran ok so I went
ahead and checked a filter in line before the pump and it seemed clean,
the gas that came out looked ok. I waited until it got colder out, in
the low 20's and took it out to the highway and after about ten miles it
started doing it again.
This stills seems like the fuel is freezing so I put in another bottle
of antifreeze,Iso-Heet. Same thing, ten miles or so at 65mph and it acts
like I'm running out of gas but when I get home in the driveway it idles
fine.
I put a new fuel pump on tonite but I haven't tried it yet. It's after
1:00am and my toes are frozen. I don't really think it's the fuel pump
but it was the next cheap fix.
Anyone have any idea why this could happening? I've had the truck for
about 2 weeks and it's always started easy and ran really well. But this
happened right after the first time it got cold and snowed.
Any ideas before I take it to a mechanic?
Sorry for the long post but I wanted to get the details.
Thanks

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Old 12-04-2005, 03:01   #2 (permalink)
351CJ
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Re: 1984 4.9L problem. Help??


"DeVere W" <stratablaster@webtv.net> wrote in message
news:19905-4392A2E5-1384@storefull-3315.bay.webtv.net...
> 1984 F150 with the inline 6. 4sp w/granny.
> I thought the fuel line was freezing going to work Thursday morning.
> The truck was cutting out bad and I was losing speed. Down shifted and
> it just kept getting worse. I switched tanks and it didn't help. I made
> it to work in granny. Chugging pretty bad. After work I filled up with
> gas and put in some fuel line antifreeze. After about ten miles at 65mph
> it started doing it again. I was a couple of miles from home and made it
> doing about 45mph with the truck still cutting out bad. In the driveway
> the truck ran ok at idle. I could rev the engine and it ran fine. I took
> it back out on the road and it started doing it again.
> So, I put in a new fuel filter at the carb, along with some new spark
> plugs and air filter, and tried it again. This time it ran ok so I went
> ahead and checked a filter in line before the pump and it seemed clean,
> the gas that came out looked ok. I waited until it got colder out, in
> the low 20's and took it out to the highway and after about ten miles it
> started doing it again.
> This stills seems like the fuel is freezing so I put in another bottle
> of antifreeze,Iso-Heet. Same thing, ten miles or so at 65mph and it acts
> like I'm running out of gas but when I get home in the driveway it idles
> fine.
> I put a new fuel pump on tonite but I haven't tried it yet. It's after
> 1:00am and my toes are frozen. I don't really think it's the fuel pump
> but it was the next cheap fix.
> Anyone have any idea why this could happening? I've had the truck for
> about 2 weeks and it's always started easy and ran really well. But this
> happened right after the first time it got cold and snowed.
> Any ideas before I take it to a mechanic?
> Sorry for the long post but I wanted to get the details.
> Thanks
>


Here's a thought.

What condition is your catalytic converter in?
I had one on a 460 that had big chunks that would intermittently move around
and almost totally block the exhaust flow.
Very similar intermittent total loss of power, you know the old potato in
the tail pipe deal...
As a side note, that truck passes the state mandated emissions test with
flying colors, even with a hollow catalytic converter.


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Old 12-04-2005, 07:01   #3 (permalink)
putt@webtv.net
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Re: 1984 4.9L problem. Help??

>still cutting out bad. In the driveway the
> truck ran ok at idle. I could rev the
> engine and it ran fine. I took it back out
> on the road and it started doing it again.


This bad behaviour sounds familiar. 351CJ suggested you check the
exhaust system, a good idea. I have a few others.
Check the egr valve. Check the vacuum advance. My main suggestion is
to check the wiring terminals to the coil. This bad behaviour showed up
on my truck, same as yours, and it liked-to drive me even craizier than
I already am. It would come/go, come/go and always at the worst
times.....highway, crossing intersections etc. Anyway, I got 'real'
determined to fix this and started checking the wiring. I'd already
replaced the ignition module. I pulled off the wiring to the coil and
noticed the terminals completely mashed. When the wiring harnass was
made, the crimp machine 'missed' the fat part of the terminal and only
mashed the very end of it and the wire. This broke all but 3-4 of the
wire strands. The coil was getting power through only these few strands
of light-guage wire! read Electrical Breakdown! Replaced both
terminals....been right ever since! This was the problem in the wire
harnass for years back then. I think your problem is electrical and if
it's not the wiring, look at the module.....see if it has leaked 'goo'
at the bottom. The module will overheat and the epoxy inside will leak
out the bottom. If this is the case and you have to replace the unit,
create an air-space between the mounting site and the unit. Getting some
air flow under the unit...helps. Also check the stator in the
distributor and all associated wiring/connections. If a carb is
involved, check the float and the choke actuating mechanism(s).
Hopefully you will find the cause of this bad behaviour!

Dave S(Texas)

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Old 12-04-2005, 07:01   #4 (permalink)
Sharky
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Posts: n/a
Re: 1984 4.9L problem. Help??

I have similar problems with my 1984 F150 right now, same engine but 3 speed
auto tranny. I am really leaning towards the Duraspark module that is
located on the left front fender. These units were known to fail and these
are the symptons they would show. My truck, the last time I had it on the
highway, would suddenly start bogging out at highway speeds, 100 km/h
usually, and slow itself down to around 60 km/h before it would come out of
its fit and start driving normally again. As you described, it acted as if
there were no fuel getting to the engine. It would do this quite a few
times in a 60 km stretch of highway, but I was still able to make it home
without a tow truck.

I don't think there is any way to test these modules to know if they are
going bad, but I priced one up and they are only $43 to replace. My first
car, which was a 1986 Tempo, occasionally did the same thing, even just on
rural roads and the Duraspark module was replaced to fix it. It was fine
after that.

Chances are we have the same problem. Good luck with your truck.

Sharky


"DeVere W" <stratablaster@webtv.net> wrote in message
news:19905-4392A2E5-1384@storefull-3315.bay.webtv.net...
> 1984 F150 with the inline 6. 4sp w/granny.
> I thought the fuel line was freezing going to work Thursday morning.
> The truck was cutting out bad and I was losing speed. Down shifted and
> it just kept getting worse. I switched tanks and it didn't help. I made
> it to work in granny. Chugging pretty bad. After work I filled up with
> gas and put in some fuel line antifreeze. After about ten miles at 65mph
> it started doing it again. I was a couple of miles from home and made it
> doing about 45mph with the truck still cutting out bad. In the driveway
> the truck ran ok at idle. I could rev the engine and it ran fine. I took
> it back out on the road and it started doing it again.
> So, I put in a new fuel filter at the carb, along with some new spark
> plugs and air filter, and tried it again. This time it ran ok so I went
> ahead and checked a filter in line before the pump and it seemed clean,
> the gas that came out looked ok. I waited until it got colder out, in
> the low 20's and took it out to the highway and after about ten miles it
> started doing it again.
> This stills seems like the fuel is freezing so I put in another bottle
> of antifreeze,Iso-Heet. Same thing, ten miles or so at 65mph and it acts
> like I'm running out of gas but when I get home in the driveway it idles
> fine.
> I put a new fuel pump on tonite but I haven't tried it yet. It's after
> 1:00am and my toes are frozen. I don't really think it's the fuel pump
> but it was the next cheap fix.
> Anyone have any idea why this could happening? I've had the truck for
> about 2 weeks and it's always started easy and ran really well. But this
> happened right after the first time it got cold and snowed.
> Any ideas before I take it to a mechanic?
> Sorry for the long post but I wanted to get the details.
> Thanks
>



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Old 12-04-2005, 08:01   #5 (permalink)
DeVere W
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Re: 1984 4.9L problem. Help??

The truck has all the service records and notes from its previous two
owners. Says in the notes the converter has been gutted. I will check it
out though.
Thanks


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Old 12-04-2005, 11:01   #6 (permalink)
DeVere W
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Posts: n/a
Update: 1984 4.9L problem. Help??

Fuel pump was no help. Same thing, almost in the same place every
time.Went a little longer this time. Started acting up right at the
bottom of a hill before my house.
The module is a Big A. I assume it has been replaced. Engine was rebuilt
about 55k ago. Haven't checked the coil yet. Cold out.
I did notice something a little odd that I've seen a couple of times.
First, under the air cleaner cover and around the top of the carb there
is a creamy, milky looking slime. Not much, but enough to notice. I
don't know carbs so I don't know if this is normal. Also it's spitting
out black water from the tail pipe. Pretty good stain on the snow.
I don't know much about vacuum lines so that might be left for a
mechanic. The previous owners had just took it on a road trip from
Kansas to Montana and back so I'm guessing this problem is just starting
or has something to do with cold.
Guess i'm going to have to call a shop next week if I can't figure it
out.
Thanks again.

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Old 12-04-2005, 17:01   #7 (permalink)
DeVere W
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Posts: n/a
Re: Update: 1984 4.9L problem. Help??

Put on an ignition module. Same thing. Took a little longer but it
still did it. Stop and let it idle for awhile and switched tanks. Ran
fine for awhile then did it again.
I'm done.

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Old 12-04-2005, 23:01   #8 (permalink)
The OTHER Kevin in San Diego
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Re: Update: 1984 4.9L problem. Help??

On Sun, 4 Dec 2005 10:58:30 -0600, stratablaster@webtv.net (DeVere W)
wrote:

>Fuel pump was no help. Same thing, almost in the same place every
>time.Went a little longer this time. Started acting up right at the
>bottom of a hill before my house.
>The module is a Big A. I assume it has been replaced. Engine was rebuilt
>about 55k ago. Haven't checked the coil yet. Cold out.
> I did notice something a little odd that I've seen a couple of times.
>First, under the air cleaner cover and around the top of the carb there
>is a creamy, milky looking slime. Not much, but enough to notice. I
>don't know carbs so I don't know if this is normal. Also it's spitting
>out black water from the tail pipe. Pretty good stain on the snow.
> I don't know much about vacuum lines so that might be left for a
>mechanic. The previous owners had just took it on a road trip from
>Kansas to Montana and back so I'm guessing this problem is just starting
>or has something to do with cold.
>Guess i'm going to have to call a shop next week if I can't figure it
>out.
>Thanks again.


Sounds like a blown or leaking head gasket... Milky slime could be
oil/water mix and the water coming out the tailpipe doesn't sound good
either. Does this water come out all the time?? Some water dripping
from the exhaust after you 1st start is normal as the water vapor
condenses but should go away after that. have you done a compression
or leakdown test??? What do the plugs look like???

I'd do a little more investigating before I threw any more parts at
it.
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Old 12-05-2005, 13:02   #9 (permalink)
c
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Re: Update: 1984 4.9L problem. Help??


"DeVere W" <stratablaster@webtv.net> wrote in message
news:14848-43932036-1372@storefull-3313.bay.webtv.net...
> Fuel pump was no help. Same thing, almost in the same place every
> time.Went a little longer this time. Started acting up right at the
> bottom of a hill before my house.
> The module is a Big A. I assume it has been replaced. Engine was rebuilt
> about 55k ago. Haven't checked the coil yet. Cold out.
> I did notice something a little odd that I've seen a couple of times.
> First, under the air cleaner cover and around the top of the carb there
> is a creamy, milky looking slime. Not much, but enough to notice. I
> don't know carbs so I don't know if this is normal. Also it's spitting
> out black water from the tail pipe. Pretty good stain on the snow.
> I don't know much about vacuum lines so that might be left for a
> mechanic. The previous owners had just took it on a road trip from
> Kansas to Montana and back so I'm guessing this problem is just starting
> or has something to do with cold.
> Guess i'm going to have to call a shop next week if I can't figure it
> out.
> Thanks again.
>


Your carb might be icing up. This is common when it is cold and damp. I'm
not sure if your engine has the plate underneath the carb that has coolant
flowing through it, but it if does, make sure that the coolant is actually
getting to the carb plate. Also, make sure that your thermostat is working
properly. If the engine isn't warming the coolant sufficiently, this could
cause the icing problem too. It would also explain why your oil is milky. If
the engine isn't warming up enough to remove the condensation from the oil
and crankcase, you can get the milky oil condition.

If you can, take the truck out on another run and drive it until it acts up
again, then pull over, shut off the engine, and remove the air cleaner right
away. You may actually see a frost like substance down in the venturis. Also
make sure that all the intake air tubes are hooked up, especially the one
for the heater tube that goes from the exhaust manifold to the air intake.
Make sure the heat riser valve is functioning on the air cleaner as well.

Here is a little reading for you about carb icing:
http://www.chevron.com/products/prod...ery.asp?img=46
http://www.ytmag.com/ttalk/messages/48669.html

Also, if you google for carburetor icing, you will get a lot more reading
material. It is especially common in the piston aircraft engines. You can
also get this problem with a throttle body, but they are usually heated as
well right from the factory.

Good luck
Chris


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Old 12-05-2005, 19:01   #10 (permalink)
DeVere W
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Posts: n/a
Re: Update: 1984 4.9L problem. Help??

You might be on to something there. The heater works ok but I did notice
the temp gauge doesn't heat up much. It's supposed to have a 180
thermostat and I don't think it gets near that. I was thinkng of one of
those grill covers that you see on some trucks. Never heard of carb
icing but I'll check out the links.
Thanks

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