Stage 2 Saab 9-3 stuttering during heavy acceleration

[CTSaab93]

I'm new to the Saab world and I've had this 2004 Saab 9-3 for a few months and recently when I am in 4th or 5th gear and I try to push the gas all the way the car starts to stutter and when I let off it runs fine. No codes are thrown and no other issues. It feels like a bad jerking feeling and I let it off before anything else might happen. When I try to accelerate slowly through the gears and build up my boost it runs fine but only when I floor it does this happen. From reading forums about other model Saabs I've heard it could be the DIC, fuel pump or a throttle body but no one seems to be talking about this model having that issue. Anyone have any insight on this? Much appreciated...

[CaptainMediocre]

When I had that happen it needed a new DIC and spark plugs. Plus the throttle body went shortly after. All common issues on Saabs but easily correctable.

[patrick w. hunt]

My mechanic told me the problem was the front cv joints but I do not believe him. I still haven't solved the problem, though, so maybe he is right.

[AVguy]

Sometimes you won't get a code in the early stage of coil pack failure. A diagnosis with a Tech2 may be able to help pinpoint the issue.

if the coil packs are original to car I would be very suspicious of them.

[SatchSportSedan]

Hi, like i just replied to another Topic, from Stephanie with an Aero-V6:

about the initial topic: engine stumbles, bucks, jerks,or how do you call it ;-?

What is the codes number? 0171? Does it clear itself after a while running OK?
Did it showed up suddenly, or after some particular handlings/maintenance/repair?

There are lists of TDC-codes, and what they mean.
Can also be the throttle pedal position sender.
It are variabel resistances, that track eachother for correct position (= throttle, power demand).

When it only happens more at spirited driving, high RPMs, I'd think about full pressure?
Maybe enough for idling, and slow driving; but inadequate at higher speeds? Clogged filter?
On the fuel line, should be a Pressure regulator.
Try fueling at other places, because can be bad fuel aswell.

Are you running on gasoline of autogas?

I have a 1.8t B207E, on LPG (with valve-saver additive automatically injected)
But it's injection rate was set way too high, by the installer.
And my plugs fouled, with a creamy dry deposite between Sparks electrodes.
Cleaning them, and setting that FlashLube rate from 6 -> 3 the correct rate for my 150BHP did it all.

Another erratic thing can be manifold and/or throttle house gasket (vacuum) leaks.


Happy fidling with your 9-3

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