2004 SAAB 9-3 Turbo

TSAR141

MEMBER
2004 SAAB 9-3
2.0L
4 CYL
TURBO
FWD
AUTOMATIC
155,000 MILES

I have a 2004 SAAB 9-3 2.0T my question is when I start the car and drive off if I accelerate to much the turbo gauge goes into the red zone and the car starts to jerk like if wants to shut down. I am constantly watching the gauge so the turbo does not go in the red zone. Do you have any advice towards what can be the problem?

7 Replies

JACOBANDNICKOLAS

MECHANIC
109,747 POSTS

Okay. Is the check engine light coming on? Have you checked to see if there is anything blocking the air intake or the intake manifold? Have you checked the EGR to see if anything is overly carboned in the intake?

If everything checks out okay, then I have to ask if any vacuum hoses have been rerouted or possibly put on wrong. If not, then over boost is usually caused by the vanes in the turbo itself sticking.

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Tuesday, October 27th, 2015 AT 5:38 PM

TSAR141

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Yes the check engine light is on

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Tuesday, October 27th, 2015 AT 9:22 PM

JACOBANDNICKOLAS

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Have you checked for trouble codes? If so, what are they?

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Thursday, October 29th, 2015 AT 6:02 PM

TSAR141

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The only thing the diagnostic machine said was that the knock sensor was damaged. I went to the car dear but they never heard of a knock sensor.

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Thursday, October 29th, 2015 AT 6:36 PM

JACOBANDNICKOLAS

MECHANIC
109,747 POSTS

It has a knock sensor. It's located on the right side of the engine block. See attached pic.

The knock sensor's job is to adjust ignition timing to a point of most efficiency. Could it be an issue, if it's throwing the timing way off.

If you can get me the code they found, it would be helpful.