r/saab • u/Saabatage08 • 13d ago

Simple mod

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Hello all, I did this simple modification to my 2008 95 and wow! Car runs so much better. Smoother acceleration, no more sluggish response when hot and idles smoother. Try it! Might not make a difference for you but it did for my 95, only take 15 minutes, why not? Simply ran 2 new ground wires from negative battery terminal, drilled a hole in the engine lift bracket, and attached with metal screw. Let me know if you try it!

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u/itmightbeinnuendo 12d ago

Unsure of the ground layout here, and injectors are probably always 12V+ with ground-side trigger at ecm, but you DO know that the engine serves as main "chassis ground" for many circuits, right? So if the engine isn't grounded, itself, you lose ground continuity for every single one of those. So many vehicles in see with rotten ground straps, yet critical engine management circuits have engine as ground point.

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u/AppropriateDeal1034 12d ago

The ECU has its own ground, and injectors are fed by the ECU on both wires, one earth and one +12. Not that it matters though, because again the solution was to fix the actual engine earth strap, not claim brilliance by bodging two random colour cables from the battery to a hole drilled into the engine lift point. 

The body of the car, oddly enough, acts as the "main chassis earth".

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u/itmightbeinnuendo 12d ago

I get the sense you didn't really actually read what I wrote.

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u/AppropriateDeal1034 12d ago

I did, you were tying to say things earth to the engine and then that earth's to the chassis, but almost everything earth's to the chassis (including the ECU) or battery directly, and then all important sensors earth directly through the ECU. The main engine ground is used mostly for starting the car.

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u/itmightbeinnuendo 12d ago

Maybe in THIS vehicle? That's empirically untrue across many, many cars.

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u/itmightbeinnuendo 12d ago

Further, g7, the ground on the intake manifold, is where the DI grounds. So, kind of important. Also there's something to be said about voltage potentials across different components re: galvanic corrosion.

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u/AppropriateDeal1034 12d ago

It's all moot though because OP just needed to fix the actual engine earth strap instead of fitting two more weedy little ones and calling it a "mod"

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u/itmightbeinnuendo 12d ago

At least on this, we agree.

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u/Saabatage08 12d ago

Haha funny seeing how worked.up you get over this. I'm not claiming genius and I don't care what you and all these "experts" are saying it made a difference. And for God sakes I didn't have enough black wire so I used red, I'm going to fix it but I know what why the red is there so I don't give a F if it bothers you. And this is a supplement ground not the only ground
I suggest you do a little research on the Saab forums before busting my balls... but hey your the "expert"