Honda power loss

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Steve - 09 Feb 2005 03:02 GMT

I have an 86 Honda Accord (carburated). When it is cold and wet it
loses power until it cannot hold speed. If I turn it off for about five
minutes, the problem goes away for about 20-30 minutes and recurrs. I
have replaced fuel filters, fuel pump and had the fuel pressure
checked. When this problem occurs, there is black smoke, so I think
fuel is not the issue. I have replaced the coil, distributor, igniter,
secondary wires, plugs, catalytic converter, oxygen sensor without
resolving the problem. The car runs fine when the weather warms up. Any
ideas?

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Lawrence Glickman - 09 Feb 2005 03:26 GMT

>I have an 86 Honda Accord (carburated). When it is cold and wet it
>loses power until it cannot hold speed. If I turn it off for about five
>minutes, the problem goes away for about 20-30 minutes and recurrs.

This part right here, it points to a distributor/ignition shorting-out
problem. Cold/wet, means inside of your distributor cap is cold/wet
seeing its an 86, when was the last time you changed it?

Wait 30 minutes, engine heat dries it out enough to run again for a
while until inrushing air from outside gets it wet again.

> I
>have replaced fuel filters, fuel pump and had the fuel pressure
>checked. When this problem occurs, there is black smoke

Red herring. Unburned crap going into your hot exhaust manifold
burning there instead of in cylinders.

>, so I think
>fuel is not the issue. I have replaced the coil, distributor, igniter,
>secondary wires, plugs, catalytic converter, oxygen sensor without
>resolving the problem. The car runs fine when the weather warms up. Any
>ideas?

Oh you have a short somewhere, your plugs aren't all firing when
they're supposed to, you can check this out very easily with some
cheap tools from any auto parts store.

Lg

PS:
f.ck You, Bobby Socks

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Bubbaearle - 09 Feb 2005 03:35 GMT

Carb icing...I had a 92 Ford Tempo do the same thing.....

Humid air cools rapidly as it passes the venturi in the carb......forming
ice

choking off air.....acts like no fuel.....then ya get a rich burn when ya
re-start...black smoke

20-30 min kill time melts ice from heat from engine......

make sure the heat riser tube from exhaust manifold to air intake is in
place.

> I have an 86 Honda Accord (carburated). When it is cold and wet it
> loses power until it cannot hold speed. If I turn it off for about five
[quoted text clipped - 5 lines]
> resolving the problem. The car runs fine when the weather warms up. Any
> ideas?

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Lawrence Glickman - 09 Feb 2005 03:45 GMT

>Carb icing...I had a 92 Ford Tempo do the same thing.....
>
[quoted text clipped - 8 lines]
>make sure the heat riser tube from exhaust manifold to air intake is in
>place.

Item A or item B.
Sounds link Bubba has nailed this one.

Lg

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Billy Bad Assr? - 09 Feb 2005 09:10 GMT

> I have an 86 Honda Accord (carburated). When it is cold and wet it
> loses power until it cannot hold speed. If I turn it off for about five

Choke or perhaps the choke pull-off!

> minutes, the problem goes away for about 20-30 minutes and recurrs. I
> have replaced fuel filters, fuel pump and had the fuel pressure
> checked. When this problem occurs, there is black smoke,

Running rich >> hmmmm -- sheet metal that is around the exhaust manifold has a
tube that should go to air filter housing!!!!

Does it? >> Important in cold weather!!! Warms the air before it enters the
carb -- @ a point within the carb the air speed increases velocity due to (the
venturi) constricted flow. Causes a wind-chill factor! In cold weather may cause
the fuel air mixture to burn rich! Causing the engine to die as well as the
black smoke that you see!

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???
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TeGGer? - 09 Feb 2005 13:14 GMT

> Running rich >> hmmmm -- sheet metal that is around the exhaust
> manifold has a tube that should go to air filter housing!!!!
[quoted text clipped - 4 lines]
> factor! In cold weather may cause the fuel air mixture to burn rich!
> Causing the engine to die as well as the black smoke that you see!

Also, the diaphragm on the diverter valve can break, resulting in no vacuum
to the valve and the flap stays shut. The vacuum hose from it to the carb
can break, causing same condition. No vacuum = no warm air to carb.

The diverter flap in the air cleaner tube can seize and vacuum cannot pull
the flap up.

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