V6 Intermittant no crank and misfiring - Saab 9-3SS Bulletin Board - Saabnet.com


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V6 Intermittant no crank and misfiring
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Posted by Peter Robson [Email] (more from Peter Robson) on Sun, 9 Jun 2019 08:42:46 Share Post by Email
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Two concerns with 08 9-3 V6 Aero. First nothing happens when trying to start, usually when hot, may or may not crank when cold. Jumping starter relay cranks but no fire. Codes claim CIM missing on bus. Going to try bypassing the ESP unit for the p-bus.
If it does start and run, it will misfire both at idle and under harder accels. Has new coils and new Saab plugs. Misfire codes include cyls. 5,4,3 and 2 with P300 random misfire. Swapped ECM with another 08 Aero that starts and runs perfectly. Does not have P0089 fuel pump code. No other codes. Tried fuel both premium and regular from several gas stations. Where to go next??

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