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Saab 9-3 Aero: 04 saab 9-3 aero convertible. Changed spark

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04 saab 9-3 aero convertible. Changed spark plugs and all 4 coils. car now starts and shuts off. For some reason I decided to disconnect the ion dodule and now the car drives but tubo only goes to halfway not much power. Also giving codes 1340 and 1315. Heard a lot can go wrong when replacing coils. Where should I be looking ?
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Customer: replied 4 years ago.

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My name is XXXXX XXXXX I am a professional here at Just Answer. I noticed that your question was not getting a response and thought I would see if you still need help with this.

If this fault occurred after the spark plugs and coils were replaced and this was not an issue before these were replaced the first thing I would do here is to double check the work that was done on the vehicle.If you had bumped something loose or left something disconnected this may cause this type of fault here so this should be the first thing that is done to see if the fault can be located.

Code 1315 and 1340 will set when a combustion signal is detected from one or more cylinders.This sounds related to the coil replacement.I would double check this replacement that was done as well as spark plug gap and installation to see if a fault is located.

Thanks Pete
Pete, Technician
Category: Car
Satisfied Customers: 27815
Experience: 17 years automotive training and experience.
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