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Yeah, usually missing under load is almost always specifically related to
fuel delivery. And yes cheap gas can ruin fuel pumps, I had one gas
station where if I filled up, it would destroy the fuel pump on my old '66
Bronco. Literally every single time, went through three fuel pumps before
I stopped buying the cheap gas, and then I was fine.
So I'd look at the fuel pump, also check the tank and make sure nothing is
blocking the pickup. The black crud could be from a disintegrating
diaphragm. You can see the pickup if your remove the fuel sender. Beware
of fumes, don't use a lighter to illuminate!
Alan
On Wed, Jun 3, 2015 at 8:55 AM, R. Price Lindsay <050.rpl@gmail.com> wrote:
> Until recently my BJ8 has run like a champ. I now have a slight
> hesitation/miss on acceleration in all gears and when standing still. I
> have cleaned the carbs (some black silt was in the bowls) and re-tuned th=
e
> engine a couple of times as well as changed the plug wires and cap last
> night. The engine ran like a top when I went to bed.
>
> Not being one to leave good enough alone I decided to check and see if it
> was the distributor cap or the plugs that were the problem (I thought it
> had to be one of the two). So this morning I put the old wires into the
> new cap, started it up and it ran rough. I then tried the new wires in t=
he
> old cap, started it up and it ran rough. So I returned everything to how
> it was last night and now it runs rough with everything the same as last
> night. Goblins must have gotten in there over the night, I guess.
>
> Anyway, I=E2=80=99ve read the archives and tried most of the suggestions.=
Today I
> removed the fuel filter, no difference although there was a bit of the
> black silt in the filter and the fuel looked cloudy (never had this befor=
e,
> it=E2=80=99s always been clear - byw, silt was in the carb bowls as well)=
. I
> looked at the distributer and plug wires in the dark, and there was some
> light at the location of plug No. 6. When I put my finger behind the lef=
t
> exhaust pipe I got only very hot air. When I placed my finger behind the
> right exhaust pipe I got a fluttering sound. I=E2=80=99ve put in 2 new r=
otors, no
> change.
>
> 1. The coil is probably 15 years (10,000 miles) old. I would test it but
> I don=E2=80=99t really know how. Any suggestions on how to test the coil=
???
>
> 2. I don=E2=80=99t want to jump to any conclusions, BUT, the miss started=
maybe 50
> miles after filling up at a discount gas station (there was little
> choice). Could the gas I put in be the culprit causing issues somewhere
> down line from the tank, i.e. clogging the fuel pumps (do they have
> internal filters - I don=E2=80=99t know)??? I=E2=80=99ve read about the =
lining of tanks
> dissolving and causing issues. *If* the fuel I put in was high in
> ethanol, for example, could it dissolve the tank lining? Is the residue
> from a dissolving tank lining a fine silt like product or something else?
>
> I really appreciate any light you can throw on this and empathize with
> those that have preceded me with this kind of problem. It is totally
> frustrating!!
>
>
> Price Lindsay
> 67 BJ8
>
>
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<div dir=3D"ltr">Yeah, usually missing under load is almost always specific=
ally related to fuel delivery.=C2=A0 And yes cheap gas can ruin fuel pumps,=
I had one gas station where if I filled up, it would destroy the fuel pump=
on my old '66 Bronco.=C2=A0 Literally every single time, went through =
three fuel pumps before I stopped buying the cheap gas, and then I was fine=
.<div><br></div><div>So I'd look at the fuel pump, also check the tank =
and make sure nothing is blocking the pickup.=C2=A0 The black crud could be=
from a disintegrating diaphragm.=C2=A0 You can see =C2=A0the pickup if you=
r remove the fuel sender.=C2=A0 Beware of fumes, don't use a lighter to=
illuminate!</div><div><br></div><div>Alan</div><div class=3D"gmail_extra">=
<br><div class=3D"gmail_quote">On Wed, Jun 3, 2015 at 8:55 AM, R. Price Lin=
dsay <span dir=3D"ltr"><<a href=3D"mailto:050.rpl@gmail.com"; target=3D"_=
blank">050.rpl@gmail.com</a>></span> wrote:<br><blockquote class=3D"gmai=
l_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left=
:1ex"><div style=3D"word-wrap:break-word">Until recently my BJ8 has run lik=
e a champ.=C2=A0 I now have a slight hesitation/miss on acceleration in all=
gears and when standing still.=C2=A0 I have cleaned the carbs (some black =
silt was in the bowls) and re-tuned the engine a couple of times as well as=
changed the plug wires and cap last night.=C2=A0 The engine ran like a top=
when I went to bed. =C2=A0<div><br></div><div>Not being one to leave good =
enough alone I decided to check and see if it was the distributor cap or th=
e plugs that were the problem (I thought it had to be one of the two).=C2=
=A0 So this morning I put the old wires into the new cap, started it up and=
it ran rough.=C2=A0 I then tried the new wires in the old cap, started it =
up and it ran rough.=C2=A0 So I returned everything to how it was last nigh=
t and now it runs rough with everything the same as last night.=C2=A0 Gobli=
ns must have gotten in there over the night, I guess.<div><br></div><div>An=
yway, I=E2=80=99ve read the archives and tried most of the suggestions.=C2=
=A0 Today I removed the fuel filter, no difference although there was a bit=
of the black silt in the filter and the fuel looked cloudy (never had this=
before, it=E2=80=99s always been clear - byw, silt was in the carb bowls a=
s well).=C2=A0 I looked at the distributer and plug wires in the dark, and =
there was some light at the location of plug No. 6.=C2=A0 When I put my fin=
ger behind the left exhaust pipe I got only very hot air.=C2=A0 When I plac=
ed my finger behind the right exhaust pipe I got a fluttering sound.=C2=A0 =
I=E2=80=99ve put in 2 new rotors, no change. =C2=A0=C2=A0</div><div><br></d=
iv><div>1. The coil is probably 15 years (10,000 miles) old.=C2=A0 I would =
test it but I don=E2=80=99t really know how.=C2=A0 Any suggestions on how t=
o test the coil??? =C2=A0</div><div><br></div><div>2. I don=E2=80=99t want =
to jump to any conclusions, BUT, the miss started maybe 50 miles after fill=
ing up at a discount gas station (there was little choice).=C2=A0 Could the=
gas I put in be the culprit causing issues somewhere down line from the ta=
nk, i.e. clogging the fuel pumps (do they have internal filters - I don=E2=
=80=99t know)???=C2=A0 I=E2=80=99ve read about the lining of tanks dissolvi=
ng and causing issues. =C2=A0<b><u>If</u></b> the fuel I put in was high in=
ethanol, for example, could it dissolve the tank lining?=C2=A0 Is the resi=
due from a dissolving tank lining a fine silt like product or something els=
e?</div><div><br></div><div>I really appreciate any light you can throw on =
this and empathize with those that have preceded me with this kind of probl=
em.=C2=A0 It is totally frustrating!!</div><div><br><div>
<span style=3D"border-collapse:separate;border-spacing:0px"><br>Price Linds=
ay<br>67 BJ8<br><br></span></div></div></div></div></blockquote></div></div=
></div>
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