Volvo AWD V70-XC70 Forum

INDEX FOR 10/2025(CURRENT) INDEX FOR 4/2012 V70-XC70 INDEX

[<<]  [>>]


THREADED THREADED EXPANDED FLAT PRINT ALL
MESSAGES IN THIS THREAD




  REPLY TO THIS MESSAGE    PRINT   SAVE 

Need help diagnosing a problem V70-XC70

posted by  Fly Navy Jets on  Mon Nov 26 12:53 CST 2007
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Mon Feb 15 15:23 CST 2010
[RELATED]

My wife has experienced engine trouble this morning. When she excels up to 35mph, around 20-25 mph the engine seems to "buck" as it is switching gears. Same thing happens when you slow to a stop from about 30 mph. Any thoughts?

1998 V70 T5

Thanks in advance.








  •   REPLY TO THIS MESSAGE    PRINT   SAVE 

    Need help diagnosing a problem V70-XC70

    posted by  someone claiming to be john.a on  Tue Dec 18 17:48 CST 2007 [RELATED]

    check the 5 coil packs. one might be out.








  •   REPLY TO THIS MESSAGE Replies to this message will be emailed.    PRINT   SAVE 

    Need help diagnosing a problem V70-XC70

    posted by  KlausC on  Wed Nov 28 07:32 CST 2007
    Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
    last visit: Fri Oct 24 10:15 CST 2014
    [RELATED]

    You need to determine if it is the tranny or the engine. Check the tranny fluid when it is hot, for color(red) and level. The engine may have a dirty throttle body, and/or dirty idle air control, which may not help either.

    Klaus
    --
    The 164 has a new home, all I am left with are a 95 854T and a 98 V70R :)








    •   REPLY TO THIS MESSAGE    PRINT   SAVE 

      Need help diagnosing a problem V70-XC70 1998

      posted by  someone claiming to be Fly Navy Jets on  Thu Nov 29 04:28 CST 2007 [RELATED]

      Good on the tranny fluid, I flushed it myself not to long ago. I drove the car myself this morning, same thing is happening, but now when I come to a complete stop, the engine dies. Does these problems sound like a dirty throttle body/air control?

      Thanks in advance!








      •   REPLY TO THIS MESSAGE Replies to this message will be emailed.    PRINT   SAVE 

        Need help diagnosing a problem V70-XC70 1998

        posted by  KlausC on  Thu Nov 29 04:52 CST 2007
        Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
        last visit: Fri Oct 24 10:15 CST 2014
        [RELATED]

        No, it sounds more like a torque converter lockup problem. If you shift to N before stopping and the engine rpm stays at normal, that is what the problem is. Newer models, 99->, can be reprogrammed at the dealer. The 1998 is usually related to dirt in the throttle position sensor or the PNP switch.

        Klaus
        --
        The 164 has a new home, all I am left with are a 95 854T and a 98 V70R :)








        •   REPLY TO THIS MESSAGE    PRINT   SAVE 

          Need help diagnosing a problem V70-XC70 1998

          posted by  someone claiming to be Fly Navy Jets on  Fri Nov 30 13:32 CST 2007 [RELATED]

          You hit it again. My indy mechanic says the same thing, torque converter problem. He says to take it to the dealer, but is this a fix I can do I my garage? It's a 98

          thanks in advance








          •   REPLY TO THIS MESSAGE Replies to this message will be emailed.    PRINT   SAVE 

            Need help diagnosing a problem V70-XC70 1998

            posted by  KlausC on  Fri Nov 30 14:20 CST 2007
            Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
            last visit: Fri Oct 24 10:15 CST 2014
            [RELATED]

            The torque converter lockup is electro mechanical and driven by the TCU. It uses speed sensor to determine if lockup should occure.
            Best diagnosed by the $tealer, there should be codes. It is not the end of the tranny.

            Klaus
            --
            The 164 has a new home, all I am left with are a 95 854T and a 98 V70R :)








            •   REPLY TO THIS MESSAGE    PRINT   SAVE 

              Need help diagnosing a problem V70-XC70 1998

              posted by  someone claiming to be Fly Navy Jets on  Sat Dec 1 04:27 CST 2007 [RELATED]

              Is the car safe to drive until I can get it into the dealer? I'm leaving for a week and my wife has no car. If I replace the PNP/throttle control switch, will it be good to go?

              Thanks








              •   REPLY TO THIS MESSAGE Replies to this message will be emailed.    PRINT   SAVE 

                Need help diagnosing a problem V70-XC70 1998

                posted by  KlausC on  Sat Dec 1 05:18 CST 2007
                Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
                last visit: Fri Oct 24 10:15 CST 2014
                [RELATED]

                Just replacing the PNP or throttle position sensor MAY fix it, but it might be something else entirely. Have your wife shift to N when coming to a stop so it doesn't stall.
                Rowing the shifter from R to L about 20 times, with the key in pos II and engine off, usually clears the PNP for a while. The speed sensor data flows through the PNP and a good diagnosis will determine whether it is the sensor or not.

                Klaus
                --
                The 164 has a new home, all I am left with are a 95 854T and a 98 V70R :)








                •   REPLY TO THIS MESSAGE    PRINT   SAVE 

                  Need help diagnosing a problem V70-XC70 1998

                  posted by  Fly Navy Jets on  Fri Dec 14 12:50 CST 2007
                  Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
                  last visit: Mon Feb 15 15:23 CST 2010
                  [RELATED]

                  Dealer says it is the thermostat/thermo control valve that is sticking and putting into "limp home" mode. does this sound legit?








                  •   REPLY TO THIS MESSAGE Replies to this message will be emailed.    PRINT   SAVE 

                    Need help diagnosing a problem V70-XC70 1998

                    posted by  KlausC on  Fri Dec 14 13:40 CST 2007
                    Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
                    last visit: Fri Oct 24 10:15 CST 2014
                    [RELATED]

                    There is a tranny fluid temp sensor, or oil temp sensor. But I have never heard of a "thermo control valve".
                    The temp sensor is used to automatically down shift the tranny when it gets too hot, usually because of a heavy load and going up hill in 4th. If the sensor fails, it will put the car into limp home mode. But it should not cause the torque converter to remain coupled and cause the engine to die.

                    I would have the dealer service "tech" clear all of the codes, then drive the car and retrieve the codes again after the engine dies or tranny flutters.

                    Klaus
                    --
                    The 164 has a new home, all I am left with are a 95 854T and a 98 V70R :)







<< < > >>



©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.