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Briefly...
Posted by David Ingram (more from David Ingram) on Wed, 12 Nov 2008 10:13:44
In Reply to: Well..., PGAero [Profile/Gallery]
, Wed, 12 Nov 2008 09:10:11
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...because you did such a good job, I'll be brief. The safety valve acts pretty much as you've described. If it detects a problem (which for some people means "the car is switched on") its sole purpose is to open up and interrupt the vacuum that acts on the throttle body. The vacuum is just sufficient, in normal operation, to exert enough pressure on an internal spring within the TB to keep the car in fly-by-wire mode. Without vacuum, this spring kicks in, overpowering the electric throttle motor, placing you in LHM.
When the valve itself goes bad, it seems to send bad data to the TCS ECU, which starts to freak out. But for whatever reason, maybe because the valve's resistance is out of spec, it doesn't always open the valve, but seems to send wacky numbers to the throttle body, which can't maintain proper idle at that point. This is why many cars just don't even run, whereas lots will run but horribly.
For the fuel pump, are you aware you can replace just the pump cartridge rather than the complete assembly? I recommend that approach as a nice money saver. Not too tough to carry out. Archives contain the procedure.
I think you and OldSaab were always on the right track but I wanted to add the TCS diagnostic to the steps you took. Glad you did and more or less ruled it out (though the swap test fails any time the fender-mounted safety valve is also bad, but at this point go with your gut).
Keep us posted!
posted by 68.195.246...
Posts in this Thread:
- '93 Aero No-Start... Ari's Checklist..., PGAero , Mon, 10 Nov 2008 08:54:13
- Gentlemen..., PGAero , Tue, 11 Nov 2008 09:45:26
- Re: Gentlemen..., David Ingram, Tue, 11 Nov 2008 12:13:20
- Well..., PGAero , Wed, 12 Nov 2008 09:10:11
- Briefly..., David Ingram, Wed, 12 Nov 2008 10:13:44 <-- Viewing This Message
- Re: Gentlemen..., oldsaab, Tue, 11 Nov 2008 10:05:09
- Re: '93 Aero No-Start... Ari's Checklist..., oldsaab, Mon, 10 Nov 2008 09:25:28
- More than likely your TCS is acting up., David Ingram, Mon, 10 Nov 2008 08:56:23
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