Although, the car doesn’t idle at exactly the same RPM all the time, so it could just be idling lower sometimes. The vibration will be more or less noticeable at the same RPMs. Sometimes the vibration isn’t as bad or I don’t feel it as much. When I replaced the last of four mounts (top passenger side) the was NO vibration at all for about an hour, then it gradually came back just as it was.I’m leaning toward the balance shafts or something to do with the exhaust, but these are just guesses and I really want to diagnose this before I take the car apart and/or throw any money at it.Ī few things that made me doubt the balance shafts: I’ve addressed all the usual suspects for “vibration at idle.” I replaced the plugs, cleaned the throttle body, cleaned the fuel injectors (fuel trims are close to perfect) and there are no codes or even any slight abnormalities according to my OBD reader. I don’t think this made any difference in the vibration, but the noise did go away. I’m guessing a hanger or heat shield, but it was certainly an exhaust-related component. I’m not sure exactly what it was because he didn’t tell me, but my brother in law (same guy who did the rebuild) fixed it and just said one of the bolts was stripped. About a month later,I noticed a fairly loud metallic rattle coming from under the car. It has since quieted down or I’ve just gotten used to it or maybe both. The sound was similar to that of a motorcycle or a car with the muffler removed, but not quite as loud. The car was noticeably louder than before. The vibration is much more substantial than what would be expected of an older high-mileage four banger.Ģ. I replaced them all with OEM mounts, which made a significant improvement, but something was still obviously wrong. The mounts were all in need of replacement, but they were the same mounts I had before the rebuild, so that shouldn’t have mattered. You would think a newly rebuilt engine would be smoother or, at least no worse than before.
Two key things I noticed right after the rebuild:ġ.When I first drove the car, the vibration was almost unbearable. I should add that the catalytic converter was replaced as well, so the exhaust had been removed/re-installed. The steering wheel and rear view mirror visibly shake.
The vibration is noticeable around 700 rpm and gradually intensifies as rpms increase to about 1000, then smooths out past that (actually still kind of rough, but it doesn’t bother me and is more like a buzzing than a shaking-I suppose because the rpms are so fast at that point.) The vibration exists hot or cold, in and out of gear, accessories on or off, and can be felt in the seat, pedals, frame, everywhere. The vibration did not exist in this quality or quantity before the rebuild. My 2009 Pontiac Vibe GT (Toyota 2.4l 2AZ FE engine) has had a rather intense vibration between 700-1000 rpm ever since the engine was rebuilt (oil burning pistons replaced) over 8 months ago. I posted a thread similar to this before, but I wanted to be more specific.
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