Question about 2002 Saab 9-5

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2002 Saab 9-5 Aero won't start when hot

I have a 2002 Saab 9-5 Aero, with 206000 miles. The fuel pump was replaced about two years ago and the throttle body about a year ago. The problem I'm having is after driving it and it's hot, it doesn't want to start back up (this has happened three times). However, after sitting about 1 1/2 hours it starts and sometimes on the start it will run rough for a few seconds and sometimes it doesn't. About three weeks before this started happening it would on occasion have a difficult time starting with an extra 5 seconds or so of cranking needed and when it started it acted like it was flooded.

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  • ORDDAY Jun 08, 2010

    I have the part and it will be installed on Thursday.

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This engine is controlled by a computer, when a problem like this occurs a fault code is set, I suspect you have a loss of ignition spark going on here, have the system tested for the code(s) that is set when the part that is causing this stall fails, this fault code test is crucial to making an accurate diagnosis and repair and is always the 1st step in this type of problem, many parts stores run the OBD2 engine control system test for free, Kragen and Autozone do this as well as many others, have the test ryun and provide the fault code(s) and we will move on, otherwise this is all a guess with you buying th parts.

Posted on Jun 03, 2010

  • 2 more comments 
  • ORDDAY Jun 06, 2010

    The problem finally occurred again where it wouldn't start and I had the OBD2 tester on hand and the code was P0336 CRANKSHAFT POSITION SENSOR A CKT RANGE/PERF.

  • yadayada
    yadayada Jun 06, 2010

    that is it! the crank sensor is the points so to speak of the system, it senses the engine rotation and along with the cam sensor signals the computer to fire the spark plug at the correct time for each cylinder. Change the sensor, it is dealer only part so when U pick it up ask the parts person to print the page that shows the sensor on the engine and it's location, a diagram is the bet way to see this and understand where to look.

  • yadayada
    yadayada Jun 06, 2010

    Mounted on the crankshaft is a slotted ring with 58 ribs. Of inductive type, the sensor is mounted on the wall of the engine crankcase. The distance between the slotted ring and the sensor is 0.4-1.3 mm and it is not adjustable.

  • yadayada
    yadayada Jun 06, 2010

    here is a picture of the sensor (typical Sabb sensor) which is held into the block by a retainer with one screw, kinda like a distributor hold down.




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