04 WRX - Engine vibration when AC is on
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This is a discussion on 04 WRX - Engine vibration when AC is on within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; I just bought the car, it's an 04 with 90K miles on it, 5 spd. When even I am at ...

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    Registered User 04WRXR's Avatar
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    04 WRX - Engine vibration when AC is on

    I just bought the car, it's an 04 with 90K miles on it, 5 spd. When even I am at idle and I turn on the defroster or AC, the motor shakes. I only notice it at idle probably because there is too much going on while I'm actually driving down the road to notice it while the car is actually moving. Any ideas? I would think if it were the pulley/compressor wheel on the compressor then it would do it whether it was on or not. Thanks for the help.
    04 WRX wagon
    Cobb Stage 1 93
    Waiting to be installed: Godspeed bellmouth DP

    Photography Portfolio: www.180Reflections.com

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    Registered User jd92677's Avatar
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    Quote Originally Posted by 04WRXR View Post
    I just bought the car, it's an 04 with 90K miles on it, 5 spd. When even I am at idle and I turn on the defroster or AC, the motor shakes. I only notice it at idle probably because there is too much going on while I'm actually driving down the road to notice it while the car is actually moving. Any ideas? I would think if it were the pulley/compressor wheel on the compressor then it would do it whether it was on or not. Thanks for the help.
    Is it a "shake" like a misfire, or a vibration? My first guess would be worn motor mounts if it is more of a vibration, or it could be you are just feeling the extra load that placed on the motor by the a/c compressor. I've seen where that load can cause a misfire to but it usually continues while you are accelerating. Just a few ideas

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    Registered User 04WRXR's Avatar
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    Quote Originally Posted by jd92677 View Post
    Is it a "shake" like a misfire, or a vibration? My first guess would be worn motor mounts if it is more of a vibration, or it could be you are just feeling the extra load that placed on the motor by the a/c compressor. I've seen where that load can cause a misfire to but it usually continues while you are accelerating. Just a few ideas
    I don't think it's a misfire, but I could be wrong. It doesn't get worse with speed. I would think if it were a motor mount it wold shake even with the compressor isn't running, right?
    04 WRX wagon
    Cobb Stage 1 93
    Waiting to be installed: Godspeed bellmouth DP

    Photography Portfolio: www.180Reflections.com

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    Not trying to steal this Thread but i am having the same problem as well....when you guys say misfire are you guys talking about hearing a popping noise when shifting in low rpms cause i am hearing a pop every now and then when shifting, its coming from somewhere near the driver and passenger seat

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    Registered User jd92677's Avatar
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    Quote Originally Posted by 04WRXR View Post
    I don't think it's a misfire, but I could be wrong. It doesn't get worse with speed. I would think if it were a motor mount it wold shake even with the compressor isn't running, right?
    I've seen where the load on the engine from the compressor being on will make a bad motor mount more prominent. Does it seem to go away if you raise the idle just a little?

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    Registered User 04WRXR's Avatar
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    Quote Originally Posted by jd92677 View Post
    I've seen where the load on the engine from the compressor being on will make a bad motor mount more prominent. Does it seem to go away if you raise the idle just a little?

    Yeah, it seems to go away when the RPM's raise.
    04 WRX wagon
    Cobb Stage 1 93
    Waiting to be installed: Godspeed bellmouth DP

    Photography Portfolio: www.180Reflections.com

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    Registered User 04WRXR's Avatar
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    All the aftermarket "nice" motor/trans mount kits I'm finding are for the STI 6 spd only. Anyone running a nice set of aftermarket mounts and the dogbone?
    04 WRX wagon
    Cobb Stage 1 93
    Waiting to be installed: Godspeed bellmouth DP

    Photography Portfolio: www.180Reflections.com

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