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    Stumbling on acceleration

    I went for a spirited drive up a mountain yesterday.

    My car had a severe stumbling problem. Power would randomly cut out while I had my foot on the gas. Seemed to me like a fuel delivery problem.

    At the top, when I got out of the car, it smelled a bit like gas. I went to open my gas cap, and it forced pressure on the cap as I twisted it. Weird! A bit of liquid tried to escape as well. The cap may not have seated fully the last time I filled up, and the rubber seal is showing age. But if it was loose, I can't imagine why there would be pressure in the tank when I went to open the cap.

    I had filled up the tank before driving up the mountain, so it couldn't be a starvation problem.

    The in-line fuel pump is exceptionally loud. I replaced that several years ago (with a Bosch unit), but maybe that's the problem? I've never replaced the in-tank pump during ownership.

    I recently passed smog and replaced the usual wear items and fluids, so I'm not concerned with those components. I also performed a smoke test to correct vacuum leaks.

    The stumbling problem seems so random; although occurs only in upper RPMs under load.... except when it had little hiccups cruising on the freeway to the mountain. I didn't experience any problems on the drive home.

    It was incredibly annoying because I haven't gone for a drive in so long, and when I finally did, this shit happens. Completely ruined the drive, especially when I had a Kia Forte on my ass trying to pass me... and did when I pulled over in defeat.

    Unrelated, but I did find tiny metal shavings last time I changed my oil.

    Currently building a badass coffee table
    Random stuff on insta @kevanromero

    #2
    Maybe try swapping afm

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      #3
      When was the last time you replaced your fuel filter?

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        #4
        Originally posted by Maddog View Post
        When was the last time you replaced your fuel filter?
        About 3-4 years ago, same time as the pump.


        Update,

        this problem hasn't returned, despite not changing anything. I haven't felt any stumbling under any normal driving conditions...I specify that because I haven't driven up a mountain again or driven the car hard around town. So I haven't felt the stumbling. But I haven't changed anything about the car.

        I did do one test, a smoke test, to understand why my gas tank had pressure at the top of the mountain. I suspected my charcoal canister or a line could be clogged, thus not relieving the sea-level atmospheric pressure that was still in the tank at 5,000+ feet. I sent smoke through the canister itself and into the line to the tank. I had smoke come out of the bottom of the canister, and out of the filler neck (filler cap was off), respectively. So those are fine, I guess?

        Other note, sometimes the fuel pump is kinda loud, most of the time not. It's just odd that it is, sometimes.

        Currently building a badass coffee table
        Random stuff on insta @kevanromero

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