Rep Power: 0

I have a 1998 hx with 130,000 miles that shakes when the engine speed is at 1500 rpms. It doesn't matter if the car is idling, in gear, accelerating, or decelerating; if the engine is moving at 1500, the whole car shakes fairly violently. It feels smooth at all other engine speeds.
It's been this way for +2000 miles, and hasn't been getting any worse. The car drives fine, it accelerates right through the vibration without a problem, but it's annoying and I'd like to stop it.
More info: The check engine light is also on, but it reads a catalytic converter code, and I don't think it's related. Also, everything in the car is stock.

Any ideas?

 
Rep Power: 0

Pull off the heat shield and inspect your exhaust manifold for cracks. Mine was cracked & threw a code for the cat. If it's cracked badly enough it will give u a vibe.

 
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Mine does this too but im not sure at what rpm since there is no gauge in the dx but its when im idling. when im accelerating its smooth as can be. the only difference is my check engine light isnt on. i want this to stop. now. i have put a **** ton of money into this car just to get it in pristine condition and this is the only thing making it not where i want it to be

 
Rep Power: 0

I took off the heat shield and sure enough, there's a crack in the exhaust manifold. It's small, maybe 1 inch long, and no where near the o2 sensor. Should I assume that this is the reason the cel was on? Can I replace the exhaust manifold alone, or am I going to need to replace the o2 sensor/catalytic converter with it? How risky is it to replace the manifold with a used one from the salvage yard?

Thanks

 
Rep Power: 235

You have to buy the whole manifold. #4: http://www.bkhondaparts.com/billkay/...itch=&hidIrno= You could maybe find a universal for cheaper but your really taking your chances that way. If your in Cali your *** out and have to buy OEM.

You don't have to replace the O2 sensor.

Salvage yards won't sell you a used cat as it's against federal law for anybody to sell a used cat.

 
Rep Power: 0

What if I buy an ex header? Can I save the cat then?

 
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Steven21, I have the same car, with the exact same issue. I had my car engine light car come on once momentarily while moving slowly in highway traffic, but then went away and never came back on. As far as the shaking, my vehicle does it every now and then. It is kinda random when it does it, but bugs the heck out of me! Whenever i come to a stop and get out of gear into neutral, and thats when it starts shaking like it wants to stall.. did u ever figure out what your issue was? I may have to check out my exh. manifold out just to be sure.