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2006 9-3, auto. Engine vibration and hesitation under

Customer Question
2006 9-3, auto....

2006 9-3, auto. Engine vibration and hesitation under partial pedal acceleration. Back off the pedal a small amount and the vibrations stops. When shifting manually, smooth, fast acceleration unless you push the pedal to the point where the vibration starts.

Mechanic's Assistant: How old is the transmission? Have you noticed any leaking?

All original.

Mechanic's Assistant: Are you fixing your 9-3 yourself? What have you tried so far?

Yes, possible. I would think the issue is related to the communications between the pedal and fuel pressure.

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

If I don't press the pedal to the point of hessitation, the car accelerates like there is no problem. It's also possible if I push the pedal to the floor, the hessitation also stops (so my son advised)

Submitted: 11 months ago.Category: Saab
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Customer reply replied 11 months ago
No significant leaks. CVs intact. The issue seems to only occur with the position of the pedal, not car speed. I can accelerate and drive with no hesitation or vibration if I only press the pedal 1/3. If I shift manually, taking advantage of higher rpm, the car accelerates fast, no hesitation or vibration. If I press the pedal to the 1/2 way point,'the vibration and reduced acceleration happens. Backing off the pedal returns to normal actions
Answered in 3 hours by:
8/3/2017
Saab Mechanic: Fix_It_Man, Other replied 11 months ago
Fix_It_Man
Fix_It_Man, Other
Category: Saab
Satisfied Customers: 17,593
Experience: I am an ASE Master Certified technician and vehicle repair specialist with over 16 years of Saab experience.
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Hello, my name is***** you tell me if the check engine light is coming on?

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Customer reply replied 11 months ago
No check engine lights. The only code when I connected to the obd2 was misfire(p1312 I believe), but not sure how old. Engine runs smooth and strong except when I continue to push the pedal to accelerate past 1/3 or so.
Customer reply replied 11 months ago
All speeds and gears, 1/3 or less acceleration auto or manual shifting
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