Henry,
My manuals are from Bosch. There is a 3 book series on all the variants L (and prior) K & KE and Motronic.
I am pretty sure they can be purchased thru performance products and/or pelican parts.
Yes just looked it up Performance Products paper catalouge pg. # 136 there is also a CIS book by James Weber offered by PP. Likely offered online also at
www.performanceproducts.com
The Bosch books are a must imo as they are factory training manuels essentially. I got mine years ago when I went thru Bosch school.
HTH's