Question about 1992 Subaru Legacy

3 Answers

Dear Sir, I own a 2006 Subary Legacy Touring 2.0/4 cylinder A/T with some 125k kms on the clock. Great car, well designed and built and a real pleasure to drive especially in bad weather conditions.. In the last few months there's a regularly occurring flaw concerning throttle response, not always, so hard to reproduce but it does happen every now and then. When the engine is revving between 2500 and 3300 rpms there is a very weak throttle response when I want the car to accelerate. The engine is holding back and the car only very very slowly accelerates. It was fine the first 115k kms but something has changed. When it holds back and I push down the throttle further, the ECU recognizes this as a "kick down", shifts down one gear and then the car becomes responsive again. My dealer has been unable to find an error let alone the solution. When an electronic diagnosis unit is connected to the car, there are no error messages. The dealer has reset the control units(s) to the original factory settings, but nothing changes really. I am under the impression that when I use a more aggressive driving style with increased acceleration the problem seems to occur less frequently. But maybe this is imagination (or wishful thinking) and it is just that the engine goes through the rev range quicker and works at higher revs than 3300 rpms and the problem will not occur. I know the car is equipped with a drive-by-wire system. So possibly something is wrong with the throttle position sensor or whatever you may call it. Does this problem sound familiar to anyone? And if so, how can it be solved? It is my intention to continue to use this car for some time because I happen to really like it. Would appreciate some real expert advice here. Kind Regards, Olav Zwarteveen, the Netherlands

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  • o_zwarteveen Sep 13, 2010

    Thanks for your swift response. But for your information, the car has been fully serviced recently and I am sure replacements of the usual parts was done by the dealer. The problem is still there however.

  • o_zwarteveen Sep 13, 2010

    Thanks for your swift response. But for your
    information, the car has been fully serviced recently and I am sure
    replacements of the usual parts was done by the dealer. The problem is
    still there however.

  • o_zwarteveen Sep 13, 2010

    The car has been fully serviced recently and I am sure replacements of the usual parts was done by the dealer. Air and fuel filters were replaced (as far as I know). The problem is still there however. If it were as simple as filters replacement, then why would the problem occur only between 2500 and 3300 prms?

  • o_zwarteveen Sep 14, 2010

    Dear Ourhowse,

    I have checked with my Subaru dealer and asked what the planned replacement of the fuel filter is.
    This is normally done at 150k kms. My car has done 125k kms, so you are right about the filter. it has not been replaced at this point. The replacement is now scheduled for this Friday, Sept 17.
    Replacement of the air filter was done at the 120k kms service, so that's is probably fine, but the filter will be inspected anyhow.

    I will let you know if this action improved the throttle response of the car.
    Thanks for being persistent :)

    regards,
    Olav Zwarteveen

  • o_zwarteveen Sep 14, 2010

    Thanks for the suggestion on the kick down cable. Will have it checked too when the fuel filter is being replaced. Was not aware there is a kick down cable, assumed it is a full drive-by-wire throttle system, also for kick down. Thanks again for your advice.

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  • Subaru Master
  • 14,036 Answers

SOUND LIKE LEAN FUEL SYSTEM.CHANGE FUEL FILTER.CLEAN FUEL INJECTORS.HAVE FUEL PRESSURE CHECKED SHOULD BE 34 - 38 PSI. ALSO HAVE IGNITION TIMING CHECK.AND CHECK FOR A LOOSE OR OPEN AIR FLOW DUCT TO THROTTLE BODY TO AIR FILTER HOUSING THAT WILL CAUSE LATE THROTTLE RESPONSE.

Posted on Sep 14, 2010

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  • Master
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Usually when the Throttle Positioning Sensor goes bad or even malfunctions one time it will throw a code and your check engine light will come on. But you said that there are no codes. I wonder if your kick down cable is getting worn. This will cause the transmission not to shift down to accelerate. The engine was not designed to make a whole lot of horsepower at low rpms. You might have the dealer check the kick down cable. That would be a good place to start.

Posted on Sep 13, 2010

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  • Subaru Master
  • 2,007 Answers

I don't see anywhere on your post where it says you have changed the fuel filter. That would be my first choice, especially since you don't have any engine lights or codes coming up. It's basically starving for fuel, or air. Check the air filter too. Good luck!

Posted on Sep 13, 2010

  • Dar
    Dar Sep 13, 2010

    Well they don't change fuel filters out of the goodness of their heart, and it isn't part of regular maintenance. If you, or they, haven't changed it, i suggest you do.

  • Dar
    Dar Sep 13, 2010

    It occurs at 2500 rpm because it is possibly getting enough fuel to that point. If your filter is partly clogged, that is what happens. If your kitchen faucet is half plugged, it will still run at half, and it will still build up full pressure. Just takes longer.

    If you want help on this site, you have to help us back. Check your receipts, or bills. If they haven't changed the fuel filter, again... i suggest that's where you start. And keep in mind that we are trying to help you.

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