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Date: Fri, 19 Aug 2005 19:13:01 +0100
From: Colin Stamp <col.dustbinnospamp.plus.com>
Subject: Re: "Throttle body" on 9-5 -- why!?


On Fri, 19 Aug 2005 15:56:02 -0000, Gary Fritz <fritzxxxnospamrii.com> wrote: >* Why does Saab have to replace the simple, cheap, near-foolproof >mechanical linkage with an expensive and failure-prone subsystem? The >only reason I can think of is the anti-skid controller, but geeze, wasn't >there a simpler and more reliable way to do it? It's so the ECU can have control over the throttle. There's various needs for that. You've already spotted the traction control. There's also cruise control and often a torque limit on the lower gears (though that might be done on the boost control). There might well be some emissions related stuff too. > >* Why is it necessary at all, since obviously the car can run just fine >without it in "limp home" mode!? Except they carefully made the "limp >home" mode inconvenient (dying at idle) so you'd have to fix it anyway. It doesn't have to be unreliable. I've driven cars with electronic throttles for years, yet the only throttle controls I've ever had fail have been cable operated ones. The real shame is that the only way the dealers seem to have of fixing it, is to bin it and fit a new one. It might be an expensive assembly, but I bet the bit of it that broke is really cheap. Cheers, Colin.

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