Power surge after 2+ hours of driving
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This is a discussion on Power surge after 2+ hours of driving within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; My 2007 wrx has been surging the last few times that I have driven for more than 2 hours at ...

  1. #1
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    Power surge after 2+ hours of driving

    My 2007 wrx has been surging the last few times that I have driven for more than 2 hours at highway speeds. The last two times I had the Cruise Control on for more than 2 hrs at 70mph when all the sudden it begins to surge when trying to throttle(i.e. when CC attempts to compensate when I start to head uphill or into a strong headwind). From that point on, the car will continue to surge as well as suffer from an increase in lag time. I have pulled over at a rest area, waited for half an hour, and the problem continued. However, after letting the car rest overnight the problem ceases until the next time I drive for 2 hours or more at highway speeds. The car has 55k, always runs 91 octane, and Royal Purple 5w30 (which is replaced along with filter every 3000 miles). There are no modifications to this vehicle.
    Any ideas on how to solve this problem?
    Has anyone else had similar issues?
    Also the Check Engine Light hasn't turned on when this occurs.
    Last edited by bmaniac; 04-02-2011 at 11:45 PM.

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    Moderator Donkey's Avatar
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    Could be knocking and the engine is removing timing. No way to tell without datalogging the car. Without a DTC/CEL it's kinda hard to really diagnose,especially over the interweb. Double check the usual stuff like vacuum lines and intake tract/intercooler/airbox clamps.
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    Quote Originally Posted by Donkey View Post
    Could be knocking and the engine is removing timing. No way to tell without datalogging the car. Without a DTC/CEL it's kinda hard to really diagnose,especially over the interweb. Double check the usual stuff like vacuum lines and intake tract/intercooler/airbox clamps.
    Thanks Donkey for the response... The problem ended up not going away after letting the vehicle sit overnight; it was constantly suffering from longer lag. The problem ended up being a loose clamp on a boost line, glad it wasn't a more expensive repair!

  5. #4
    Registered User teflon_jones's Avatar
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    Glad to hear you fixed it. Donkey was right on with the answer though even without really knowing what was wrong. The vacuum lines are the most common source of this problem on an unmodified car.
    Scott
    Past Subies - '11 STI Limited stage 1+ and '04 STi stage 2+
    '13 Wrangler Rubicon - custom front bumper w/12k lb winch & off-road lights, skid plates, diff guards, etc.
    '04 Porsche 911 Turbo GT2 clone 600 HP/TQ
    '77 F-150 heavily modded for off-roading

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