Dangers of fuel Enrichment

[Shannen Durphey]

Bill Edgeworth wrote:
<snip>

> He had a carb backfire during cranking and with the huge plenum on the
> Manifold being filled with air and fuel it shattered the manifold.
> Backfires of this type generally are not a problem with efi but if
> anyone is running a big plenum that has enrichment during cranking
> beware!
> 
> Bill Edgeworth

Certain model Oldsmobiles, say 1996 w/3.8l K engine had a calibration
revisement due to this possibility.  Olds bulletin stressed that the
possibility was rare, and the conditions were complex.  Nevertheless,
some intakes had blown up (Uhh... GM said "fractured") during startup
due to backfire.  This problem was related to the engine and
calibration and not the vehicle, so other makes were affected also. 
Bulletin no is 97-c-02 for anyone who is interested.
Shannen