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Old 19 Dec 2010, 08:43 pm
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Join Date: Aug 2010
Posts: 28
Question Increasingly annoying and rough acceleration/idle

Hello all,

I have a carbureted 1989 Honda Accord LX 4 door sedan. I have owned this car for almost 2 years and I am about fed up with this rough idle and rough acceleration issue that has been going on the entire time I have owned it. The vibrations are so bad that the rear view mirror and the glove box rattle when idling and the keys in the ignition vibrate during acceleration, particularly in 2nd gear or on the freeway. When I drive people around in my car I get weird looks while the keys vibrate and it's becoming annoying and hard to ignore myself. This issue is getting worse and it also seems to be accompanied by a loss of power under acceleration. The engine ALWAYS starts though, I am not sure if this helps or not. I have a genuine Honda repair manual for this car but it has no topics or resolutions of a rough idle and acceleration. Here is a small list of things I have done to try and resolve this issue:

Carburetor rebuild
Replaced PCV valve (this helped the most, did not solve the issue however)
Replaced spark wires & plugs
Changed crankcase breather filter
Adjusted carburetor
Replaced fuel filter
Replaced rotor/cap assembly
Replaced spark plugs
Adjusted timing
Searched for and fixed any vacuum leaks

This issue is on and off and gets worse the more I drive it. However if I don't drive it for a day or two, the issue subsides a little bit then comes back as I drive it around more. I have a bad valve gasket, bad enough to the point where oil leaks onto the exhaust manifold. I am working on replacing the gasket, however is this related to the rough idle and rough acceleration by any chance? Any help is greatly appreciated. Thank you.
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