I'll second Bill's recommendation of the Bosch Fuel Injection book.  It
is extremely thorough and well written, and can be understood by anyone
with a high school diploma.  Well, maybe. ;-)

I have found it indispensable for trouble shooting.  I recently used
information I found there to set my CO so it would pass emissions.  That
saved paying someone $40, and paid for the book.

For those who are curious, the book states that a hot O2 sensor should
generate about a half a volt at the proper mixture setting (lambda = 1)
at idle.  Now you can use a voltmeter to at least approximate your CO
setting!  This info is not in the Bentley, they tell you to measure the
CO with an analyzer, something  most of us don't have.

--
Stuart MacMillan
Seattle

'84 Vanagon Westfalia w/2.1
'65 MGB (Daily driver since 1969)
'74 MGB GT (Restoring sloooowly)

Assisting on Restoration (and spending OPM):
'72 MGB GT (Daughter's)
'64 MGB (Son's)

Stripped and gone but their parts live on:
'68 MGB, '73 MGB, '67 MGB GT