[Gmecm] Stives, and the 2.8l EFE grid

[davesnothereman at netscape.net]

 The EFE grid is in place for emissions.  When the grid fails electrically, it no longer heats up when commanded.  At this point, it (the grid, not the carb) is susceptible to icing, which will restrict the amount of air allowed into the engine.  With the grid removed, there's little opportunity for it to impede airflow even if frozen in a block of ice.  You could try experimenting with a new grid installed and left disconnected.
 
I played around with screens and heaters under carbs for a few years and I can tell you that warmed intake air can be critical to ice free operation.
 
Zaphod




 Stives, and the 2.8l EFE grid


Hello folks,
I'm not sure what conditions would cause icing in some
2.8s and not others, but I bought my 2.8 with a carb,
and I heard about how the ceramic comes off the grid
(mine was 20% gone when I looked).  I subsequently
removed the grid entirely, and had no problems driving
on extended ski trips through the Rockies, Idaho, and
up and down the Coast to Whistler and Vancouver's
local mountains.  Over 10 years, altitude, humidity,
and -26 deg temps over the Coquihalla (5,500 feet
highway) to ski in the interior have never caused any
problems.  Maybe the lower engine compartment profile
of the Cherokee (compared to a Blazer) keeps the carb
warmer?

Two winters in, I'm also having no problems with my
unheated Fiero throttle body now on the same engine -
no problems yet, even after a few ski trips to the
interior (3000 ft, -20).

I have experienced icing in an aircraft carb - not
fun!  But not in a car yet...

I doubt stoves make much difference to icing, and I
know the EFE grid was useless (and restrictive!) in my
Jeep!

Just my two cents. :)

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