Turbo problem (low boost): UPDATE
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  1. #1
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    Turbo problem (low boost): UPDATE

    I started having problems with turbo boost yesterday when I left work; it has been intermittent since then.

    Problem: I am only getting about 2 psi of boost (in all gears) most of the time. However, if I'm cruising along, let off the throttle, then get back on it, sometimes I can hear the turbo kicking back in and I will get my normal boost range of about 15 psi. I'm not sure what is going on. Could it be that the wastegate is stuck in the open position?

    I would greatly appreciate any input.

    Thanks,

    Raul

    PS- The Passat 1.8 is a dawg without the turbo. The car can barely get out of its own way.


    UPDATE
    After searching around here a bit and talking to a VW tech at a local dealership, it sounds like I am going to have to replace the wastegate actuator on the turbo. Of course, the VW dealership will only replace the whole turbo (at a much higher cost). I know the actuator can be purchased from ECS Tuning for about $170, but the question is How difficult a job is it to replace the wastegate actuator? I'm pretty handy and have done some work on my car and I also have access to a lift and plenty of tools at my work.

    Has anyone done this themselves? How long does it take? Where do I start?

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  3. #2
    4th Gear
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    Sounds like you have a boost leak somewhere or a faulty DV. Good luck

  4. #3
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    Do you have acess to a VAG? Your idea of maybe a faulty waste-gate actuator rod or something might be right. I would check what your waste-gate duty cycles are.

    Or you could simply have a leak, but I imagine that you wouldn't be able to see higher levels of boost if this was the case.

    I want to say off the top of my head that it's vag block 115 that has wastegate duty cycles....correct me if I'm wrong

  5. #4
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    It's definitely not a boost leak, I've had that problem before and it definitely presents itself differently. With a boost leak you usually cannot maintain higher levels of boost. When I am holding boost correctly, I'm sitting firmly at 15 psi. When it is not working, it won't budge above 2 - 3 psi.

    I do not have access to a VAG. Does anyone close to Charlottesville, VA (Richmond or NOVA) have a VAG COM?

    Also, would the dealer be able to chekc the wastegate duty cycles?

  6. #5
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    yes they could....I'm sure there is someone around your area that could help you out. The stealership might charge you an arm and a leg.

    I'd help ya, but NH is a ways away

  7. #6
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    UPDATED: see original post

  8. #7
    Neutral
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    Orlando, FL USA
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    i have recently replaced my turbo on a hunch that the wastegate was shot. for the past two years i have had a bad metalic rattle coming from the tubo/cat area and narrowed it to the waste gate. so upon replacing the turbo i found that the exhast turbine housing had several cracks and the wastegate itself had about an 1/8" gap before it would close. thus never allowing full boost. after replaceing it, she drove like a new bat out of hell oddly enough sometimes reaching 17.5 psi (with other mods of course) before she wouldn't even spool up when sitting still. it is a 99 AEB 1.8t w/ 134,000 miles

  9. #8
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    RacingEuro,

    Did you do this work yourself? A few months ago I also started hearing a rattling sound coming from the engine compartment, but I ignored it. I would appreciate any input you may have. Thanks.

    Raul

  10. #9
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    Good Luck - keep us updated - seems like a problem that is worth knowing is out there.

  11. #10
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    First be sure the actuator is the problem. There are diagnostic symptoms if you do a search. I have replaced the wastegate actuator on my K03. I got my actuator from a B-W diesel repair shop in Ohio. Same as what ECS sells only mine cost $85 through the shop. Bought the turbo install kit from ECS. Installation is a bit of a pain since the entire turbo had to be removed to get the part free and hook the new one to the wastegate pivot. I used Hermann's K04-15 turbocharger upgrade writeup in the "How-to" section. (Thanks Hermann) It took about 8 hours taking my time and with breaks/interuptions. On the difficulty scale it is about the same as timing belt change. The wastegate flap valve and linkage were in good shape. Bottom line is my car is running like new.

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