2003 WRX surging acceleration?
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This is a discussion on 2003 WRX surging acceleration? within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; I have 2003 WRX with an automatic transmission and I'm having a surging acceleration issue. It usually doesn't do it ...

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    2003 WRX surging acceleration?

    I have 2003 WRX with an automatic transmission and I'm having a surging acceleration issue. It usually doesn't do it 0-60, but after that, it tends to surge/go/surge/go. It doesn't buck or anything. I only have 50,000 miles on her and take good care of the car so I don't know why it just started doing this. No check engine light and idles fine/runs fine. I've checked all vacuum lines and everything looks good. :screwy:
    Any suggestions, answers wood be great. Thanks.

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    zax
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    Do you have a boost gauge? The question would be: are you hitting target boost without boost spiking and/or boost creep? Is the car stock? Do you have any way of datalogging?
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    Everything on the car is stock, besides K&N air filter in the original box. I have not adjusted nothing, and have done oil/everything right. The only people to work on the car besides Delta Subaru is me for doing a couple oil changes w/synthetic oil. There was a recall over a year ago, and they worked on her, but I'm afraid that somehow they did something wrong and since I don't beat on my car, it's just becoming an issue now. Possibly a manifold leak. Being it's over a year, and it just started hesitating in the last couple months, I don't know if they would take responsibly if it was there fault. I like 0-60, but I'm also a top speed guy that wants her to go to the limit if needed.
    Any tests without going to a shop that I can do is appreciated. Once again, vacuum lines/fluids/and other simple stuff has been checked and they are fine. I have no boost gauge. Car is completely stock.

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    Also, had a scanner put on it, not only is the engine light NOT on, scanner threw no codes.

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    Good news, everyone! xxxxxxxAnub1s's Avatar
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    Have you only done a visual check on the vacuum lines or have you inspected them very carefully? Even a hairline crack in a line can cause an issue like you're describing. Could also be a failing BCS, or a problem elsewhere in the system, but since you're seeing boost fluctations, it's reasonable to focus on the boost control system.
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