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lurching when accelerating above 60 mph V70-XC70

posted by  pbierre on  Sun Jun 30 19:10 CST 2019
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last visit: Sun Mar 30 18:53 CST 2014
[RELATED]

This is an '04 XC70 with 120K miles, well-maintained. B5254T2 engine built for CA/USA.

Recently, while driving on the freeway, I noticed that when I step on the gas above 60 mph, the car lurches.
It feels like an instantaneous "kick" forward, then recoil back, each kick over with in 1/3 sec. It feels like there is an instantaneous bump in engine power (acceleration) followed immediately by a decelleration. It only happens above a certain amount of acceleration. If I switch on cruise control, and tap the "+" switch to speed up, the acceleration is very slight, and there is no kick. If I floor the gas pedal, the tranny responds properly with a kickdown into 4th. I can slowly accelerate from 60 - 80 mph using the gas pedal with no kick.

I studied and graphed some ECM parameters using my OBD-II scanner. The results shed more light on this completely repeatable engine fault that leaves no codes:

http://www.volvoxc.com/forums/showthread.php?45081-Throttle-quot-kick-quot-during-accelerations-over-50-mph

Any thoughts on how to diagnose this problem?







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    lurching when accelerating above 60 mph V70-XC70

    posted by  Chris Mullet on  Mon Jul 1 06:29 CST 2019
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    last visit: Fri Oct 24 09:08 CST 2014
    [RELATED]

    I would try the simple/free stuff first like cleaning the throttle body and hooking up a fuel pressure gauge in a way that I could monitor fuel pressure while driving. If nothing looks obvious then maybe a new set of copper core spark spark plugs (inexpensive).








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      lurching when accelerating above 60 mph V70-XC70

      posted by  pbierre on  Sat Jul 6 15:13 CST 2019
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      last visit: Sun Mar 30 18:53 CST 2014
      [RELATED]

      Thanks for ideas, Chris. The "lurch" or "stutter" was fixed by the following:
      - new plug and coils
      - new air filter
      - removed & cleaned throttle body

      Lesson 1: not all engine misfires are reported with a DTC
      Lesson 2: follow the PM advice to replace plugs and coils after 100,000 miles (I made it to 120,000 before first symptoms of trouble).







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