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How do I get my 4.5L to coast down to the "70 mpg" benchmark?

787 Views 0 Replies 1 Participant Last post by  mdogg1950
I know now my '90 DeVille is "coasting down" properly when that "70 mpg" appears (mine currentl doesn't). I also know I need to adjust the voltage to the TPS by overriding the ISC exrension/retraction.
Question: I know how to get into diagnostics to check codes, but what buttons do I push to get to E.5.3, which is the ISC override function?
Thanks, all!!!
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