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Hello,
I am a Saab dude, I have a 1994 9000 Aero and a 2008 9-5 Aero. I have been on this board for a long time and I love all the inputs and the spirit of this effort! I know for a fact that there are many owners of Saab 9-5s with slow acceleration issues. I too have been fighting this issue replacing almost every part including TB. I have come to find out, that the ground wire that screws onto the thermostat eventually loosens under the bolt in the soft Al thermostat hsg and looses clamping force that is required to keep continuity with the wire under the bolt and eventual engine block in order to get ground. This btw is the 10mm bolt. The other end of the wire splices into the stationary bulkhead where there is yet another splice on this ground. If there is a break in any of those two areas, the trionic system falsly thinks this is detonation and the computer pulls timing up to -20 degrees (-200 igoff) otherwise known as ignition offset in open sid. When hooking this wire to a better grounding point or directly to the battery, the issue goes away and hard acceleration all the time returns (until your intake temps exceed 45c). I would add that the aftermarket tunes like Brew City Boost or Eeuroparts, Maptun etc offer open sid feature which adds live data on your dashboards. It shows this info which helps.
When removing the bolt on the thermostat hsg, on all occaisions, the vibration strips out the hsg threads of which often reside on the bolt threads upon removal. At this time is when the slow acceleration is most prevalent. When its loose and stripped offering no contact to the engine grounding point. I even bought a new hsg with fresh threads, but the aluminum hsg mated to the steel screw on the heavy ground cable does not hold up to the engine movement on the motor mounts and inherent vibrations thus erroding the threads overtime. so I arrived at same issue eventually. This is a clear design flaw and frankly surprising. Or maybe not given all the GM cost cutting.
Try it. This will be the end of the saga. :-)
Sam
posted by 37.120.21...
1
, Sat, 18 Jan 2020 02:27:591
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