Pulsing under load question
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    1. #1
      Junior Member mshin's Avatar
      Join Date
      Sep 2007

      Pulsing under load question

      Infrequent poster here and 100% dealer maintained 2007-V70R. I have a new issue that's popped up where I have a strange pulsing under heavy load. Here in Colorado, pulling up I70, we put a solid demand on our turbo. At speed and under load, the engine seems to pulse on and off power almost as if something is holding back the turbo. I've read horror stories about cracked blocks/cylinder walls, leaking coolant etc.

      Could any surmise what might be occurring or what I might expect?

      BTW, I have the an IPD tune from 2016, otherwise all else is stock and perfectly scheduled maintenance.


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    3. #2
      Junior Member b5v6's Avatar
      Join Date
      Sep 2004
      San Diego, CA
      Could be a vacuum leak with turbo control valve, had similar experience with my Audi, if I understand what you're describing.

      Instagram: @oliepyle
      '05 S60R - 2.4R, RaceS60R FMIC, RaceS60R Downpipe, SPEC LWFW/Stage 3 clutch, Elevate upper mount, Forge CBV, Phuzzy HDTCV, Eibach, IPD Sways, Powerflex/Superflex CA bushings, JVC M730 Head Unit (Android Auto, Subwoofer, Back Up Camera)
      '99 Audi A4 1.8T Stage 3...

    4. #3
      Junior Member shurgen's Avatar
      Join Date
      Apr 2007
      Valley Forge, PA
      First thing to check if turbo control valve is original. If that thing is acting up, power will be miserable. TCVs last 100k miles give or take. Mine went at 125k miles. From what I recall, there was no CEL and no codes, car did not produce power and king of hesitated. If you have a friend with R near by, try his/her TCV.
      04 V70R Red/Atacama, 100k miles, M66, Rica 2, Elevate DP and sways, JRL mod, 3"CAI, Viva CBV, Heico V's.
      06 V70R Sonicama, 135k miles, GT, MTE stage 2, IPD DP and sways, MTE catback
      07 V70R Titanium/Nordkap, 142k miles, M66, Elevate DP, Heico catback, IPD sways, PDV collar, Heico V's

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    6. #4
      Junior Member Rodtheviking's Avatar
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      Jun 2019
      Vancouver, WA
      I have been using this one since mine went out.


    7. #5
      Member MN-TURBOR's Avatar
      Join Date
      Jun 2011
      Twin Cities, MN
      Quote Originally Posted by Rodtheviking View Post
      I have been using this one since mine went out.

      this is the correct part number for a P2R

      2007 S60R - Ti Grey/Atacama M66 - Stage II Shark Tune - 8EightFab downpipe - Custom Magnaflow Exhaust - SNABB FMIC/Intake Pipe - TWM Short Shifter - Forge CBV - UR Front Brace/Rear Brace - IPD 28mm Rear Sway Bar - BC Racing Coilovers
      2007 XC90 V8 Sport - Electric Silver - Muffler/Resonator Delete
      2007 XC70 - Ice White - Stage I Shark Tune - Muffler Delete

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