DFI, Batch Fire, and other myths

[Shannen Durphey]

Greg Hermann wrote:
> 
<snip>
> >According to a service bulletin, the 3.8l engine suffers from carbon
> >accumulation on the back of the intake valve which significantly
> >reduces performance.  I've seen the effects. It's very similar to
> >losing the accelerator pump on a carb'ed engine, and the exhaust is
> >excessively rich.  My thought was the carbon is insulating the valve,
> >preventing vaporization.
> >Shannen
> 
> The carbon (more accurately coke, the black kind)  is residue from the
> gasoline. Run av gas and it won't happen :-) !! It can also restrict
> breathing pretty drastically.
> 
> Greg
Lessee... Av gas was missing something, maybe detergents or the added
lubricants that are in auto gas?  Can't remember.  Is there any truth
to the story that unleaded av-gas is more correctly called low lead?  
Shannen