Volvo AWD 850 Forum

INDEX FOR 10/2025(CURRENT) INDEX FOR 6/2015 850 INDEX

[<<]  [>>]


THREADED THREADED EXPANDED FLAT PRINT ALL
MESSAGES IN THIS THREAD




  REPLY TO THIS MESSAGE    PRINT   SAVE 

black smoke - plz help 850

posted by  someone claiming to be scott k on  Sun Mar 19 13:14 CST 2006 [RELATED]

sorry about the repost - "black smoke" might be a more appropriate subject line -

96 850T gave a really wierd hesitation as i was accelerating - almost thought she was going to stall out. got up to normal speed finally, but what i thought was a hesitation was actually (i think?) the turbo not fully kicking in. the turbo guage will not go into the white boost section, also there was some black smoke intermittantly as i looked out the RVM (can't say for sure that it was coming from the exhaust, but i assumed it was.) as long as i didn't accel. too hard, it was fine, but very abnormal turbo boost. any thoughts appreciated.

btw- i had just filled up with prem. and checked the oil, which was fine. bad gas maybe??

scott k.








  •   REPLY TO THIS MESSAGE    PRINT   SAVE 

    black smoke - plz help 850

    posted by  yona on  Mon Mar 20 01:10 CST 2006
    Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
    last visit: Mon Oct 8 20:50 CST 2012
    [RELATED]

    scottK:

    I had a similar problem a couple of years ago, on my ex-volvo, a 740. It was giving off black smoke on acceleration and generally choking itself. Turned out to be the fuel pressure regulator. It is at the end of the high pressure fuel rail that distributes fuel to the injectors. But again, it could be the air flow box or even a temp sensor in its last hours causing the problem. The latter often causes the engine rpm to go up and down while idling. If you have time, read the troubleshooting page for the 7xx engines which applies to the 850 as well:

    http://brickboard.com/FAQ/700-900/EnginePerformanceSymptoms.htm

    In any case, get it checked soon before the rich mixture messes up the catalytic converter.

    yt855
    1994 v855 5spd, na, 110k








  •   REPLY TO THIS MESSAGE    PRINT   SAVE 

    black smoke - plz help 850

    posted by  MadeInJapan on  Sun Mar 19 13:18 CST 2006
    Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
    last visit: Sat Oct 2 06:34 CST 2010
    [RELATED]

    Sounds like it could be the MAF...do you smell rotten eggs from the Catalytic converter? If so, disconnect the MAF and see if this straightens things out. If things work better with it off (will set codes so you'll have to get them cleared...probably already set though) then it is the MAF and you need to replace it. If that's not it, then I suspect you got some bad gas somewhere.
    --
    1998 S70 T5 Emarald Green Metallic, 2004 V70 2.5T Ruby Red, Previous Owner of Black '94 850 Turbo Wagon. My cars have been running so well lately they've got me worried.








    •   REPLY TO THIS MESSAGE    PRINT   SAVE 

      black smoke - plz help 850

      posted by  someone claiming to be scott k on  Sun Mar 19 15:57 CST 2006 [RELATED]

      that would be a HUGE relief. if it is bad gas, is there a way to evacuate the tank, or should i just run it out?

      thanks MAJ!!








      •   REPLY TO THIS MESSAGE    PRINT   SAVE 

        black smoke - plz help 850

        posted by  MadeInJapan on  Sun Mar 19 16:28 CST 2006
        Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
        last visit: Sat Oct 2 06:34 CST 2010
        [RELATED]

        There is a way to evacuate it but if your car isn't running terribly rough I would just run it out. If you do want to evacuate it, locate the shrader valve on the end of your fuel rail. It will have a plastic cap threaded onto it. Fit a hose to this and from the hose let it run into a certified gas container. Just keep the key in the ignition (to postion II) without starting your car and the fuel pump will stay on, pumping your fuel out. Problem is, if you have a full tank, or close to it, we're talking about 18 gallons. You might try a gas additive like Chevron Techron (sold at most autoparts stores) to see if this help as well as another additive to get rid of any water in the gas system. Hope this helps.
        --
        1998 S70 T5 Emarald Green Metallic, 2004 V70 2.5T Ruby Red, Previous Owner of Black '94 850 Turbo Wagon. My cars have been running so well lately they've got me worried.







<< < > >>



©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.