Volvo AWD 850 Forum

INDEX FOR 10/2025(CURRENT) INDEX FOR 9/2009 850 INDEX

[<<]  [>>]


THREADED THREADED EXPANDED FLAT PRINT ALL
MESSAGES IN THIS THREAD




  REPLY TO THIS MESSAGE    PRINT   SAVE 

engine dies 850

posted by  someone claiming to be down and out on  Fri Jan 20 19:07 CST 2012 [RELATED]

Greetings. Engine died suddenly on road. No hint of trouble coming. Towed home. Engine cranks good but will not start. 45lbs. at fuel rail while cranking. Good hot spark off coil while cranking. Distributer rotor turns while cranking so timing belt good. Also cam and crank sensors are providing a firing solution and giving a hot, pulsing spark. Power stage and coil also must be good. Tested injector leads with a noid light and getting a bright pulse at #1 cyl. while cranking. After prolonged cranking, cannot smell any gas fumes around engine or at exhaust. Unusual? Thought the injector driver circuitry in the ECM was shot but the noid light suggests otherwise. I'm missing something and would be most grateful for some direction. Thanks very much. Bob








  •   REPLY TO THIS MESSAGE    PRINT   SAVE 

    engine dies 850

    posted by  someone claiming to be fixit2002 on  Sat Jan 21 08:28 CST 2012 [RELATED]

    Other than taking the injector rail off to verify they're squirting I don't know what else you could do. Maybe try squirting some oil into the spark plug holes to get the compression back up.








    •   REPLY TO THIS MESSAGE    PRINT   SAVE 

      engine dies 850 1996

      posted by  someone claiming to be down and out on  Sat Jan 21 10:10 CST 2012 [RELATED]

      Thanks for your interest. About to pull off rail,check compression and strength of spark at plug over prolonged cranking.








      •   REPLY TO THIS MESSAGE    PRINT   SAVE 

        engine dies 850 1996

        posted by  someone claiming to be down and out on  Sat Jan 21 13:05 CST 2012 [RELATED]

        Fuel spraying from injectors. Noted that spark strength faded after extended cranking. Changed out the coil/power stage assembly with a spare and engine started. I should have known. Over the years, these things have failed on our 740s. Had 2 fails with the 850. Usually they show an imminent fail by first missing at speed or miss when hot in summer. This is my first sudden death fail from a coil/power stage assly. So long for now. Bob.







<< < > >>



©Jarrod Stenberg 1997-2022. All material except where indicated.


All participants agree to these terms.

Brickboard.com is not affiliated with nor sponsored by AB Volvo, Volvo Car Corporation, Volvo Cars of North America, Inc. or Ford Motor Company. Brickboard.com is a Volvo owner/enthusiast site, similar to a club, and does not intend to pose as an official Volvo site. The official Volvo site can be found here.