1979 Bus "California" and "Federal" Identification

by Karl von Salzen

[refers to 1979 bus engines in US according to Federal or California emissions standards]

Look at the left end of your gas tank panel. How many relays do you have?

1 = California
2 = Federal

You can also pull out your FI ECU and look at the # on it:

039 906 021D Cal Standard trans
039 906 021E Cal Auto trans
039 906 021B Fed Standard trans
039 906 021C Fed Auto trans

You can look at the # on the cover of the AFM:

0280 200 022 Cal
0280 200 020 Fed

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