lotus

previous page: 54  Low front end
  
page up: chrysler FAQ
  
next page: 56  Diagnosing Problems In Computer Controlled Carbureted Engines

55 Pinging on V-8s




Description

This article is from the Chrysler-Plymouth-Dodge FAQ, by Dr. David Zatz with numerous contributions by others.

55 Pinging on V-8s

Pete O Dickerson wrote: My 75 Dodge Swinger 318 would ping at part throttle
operation, not at full throttle (floored!) like you might expect. Just going
over an overpass or up a hill the engine would ping and clatter, even
though the
ignition timing and carburetor were set correctly.

The manifold was made from cast metal. The molten metal was poured into a
mold
through a little hole and when the manifold was finished, the little hole was
plugged up with a little rubber plug. Well, after a few years this little
plug
would dry up, shrink, and fall out, leaving a hole in the manifold. This hole
would cause a lean condition to exist at part throttle operation, by
letting air
leak in.

Try removing the carb and shining a flashlight down into the manifold and
seeing
if there is a hole in the bottom of the manifold. You can either plug it
up or
replace the manifold with a more performance oriented unit.

(The maintainer adds: invest in a vacuum gauge, they are cheap!)

16: Fast idle, then stalling.

>From Timothy Economou: If you start your car and it runs for a while at fast
idle and then it starts to load up and then stalls. There is this little
round
thing on the open end of your breather that closes the outside air when
your car
is at fast idle and lets it draw air from the manifold. (Stove control). Check
it.

Editor's note: the stove control is frequently bad on vintage vehicles. The
vacuum hose, control, and mechanics of the flap in the air horn should be
checked. See above.


 

Continue to:













TOP
previous page: 54  Low front end
  
page up: chrysler FAQ
  
next page: 56  Diagnosing Problems In Computer Controlled Carbureted Engines