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Hello saabscene, I am new to this community and appreciate all the help I can get. My 2005 saab 9-5 2.3T has just today started idling rough, paired with the p0327 faut code. This happened just after I did a hard accelerating pull in 2nd gear (Unwise to push an older car in that way but what is done is done). I had no engine light before or any trouble with the engine. I am wondering what I should look for in an ettempt to solve this. I would assume it is something mechanical that has gone wrong seeing as it happened after a hard pull almost to redline. Any ideas?
 

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Young_Aero,

Don't worry, these cars are built to take hard driving. My list gives Knock Sensor 1 low input for P0327. I think the knock sensing is part of the DI cassette function so it could be just a fault with that. Not really serious, these cassettes are about £200 for a decent ( non Chinese ) one. Look also for codes 1312 and 1334 which would indicate intermittent misfires on cylinders 1 / 2 and 3 / 4 respectively.

Paul @ Kippen
 

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The knock sensor is on the block to detect shock from cylinders. The DI could be arcing to the head making it think it is knock. You often get mifire errors when there is an issue with the DI. Otherwise it could be a problem with the senor or the connector and wiring for it.
 
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