Date: Sat, 13 Sep 2003 10:37:18 +0100 From: "Adrian England" <adrianospam.moleskinnopsamin.net> Subject: Re: Turn the "Shift up" light off?
Brenden Conte wrote: > I own a '99 Saab 9-5 (4cyl manual). I fell in love with in a year > ago, bought it used from the dealership. But like any good love > story, theres always something. In this case, its the "shift up" > light. > > Its a two part question, really. > > 1) How does it decide you should "shift up"? I couldn't find anything > on this, and it definately lights up at times that would be > inopportune to shift up (i.e. i lay off the gas a little in a hilly > section of NY, where i drive). The best i can tell is a very simple > calculation of RPM and applied fuel. Absolutely correct. The shift light comes on when engine speed is above approx 2k rpm and engine load (measured by injector open time) falls below a preset value. Its trying to tell you you could achieve better economy in a higher gear, but it cannot predict the oncoming terrain. > > 2) Is there a (free) way to turn this off? Of course, I'd like to not > fork over money to the dealer for something so trivial, but after a > year, its really starting to get on my nerves! > > Thanks, > Brenden -- take off "ospam" to mail me
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