eswaroop wrote:
> Badly need help figuring out what is wrong. All this started after a
> valve adjustment which was done improperly, and fixed later by me.
>
> Here is what I know till date. The car runs okay for the first 15
> minutes or so and then the performance and mileage drop drastically.
> It seems to limp around even if I floor the pedal.
>
> No CEL codes
>
> The ignition timing advance is 10 degrees during idle ( must be
> between 11 and 13 according to the honda diagnostics unit).
>
> The spark plugs are blackened (sooty, so rich mixture)
>
> The o2 sensor is shifting between .1 and .89 volts, but quickly enough
> or not - I dont know..
>
> The car revs smoothly, too smoothly than it ever did earlier in fact
> (maybe sign of retarded timing)
>
> I think the exhaust is heating up a lot more than usual (again sign of
> retarded timing?)
>
> Drives okay for around first 15 minutes, then acceleration and
> response declines drastically as I drive longer, mileage also suffers.

Has the air filter collapsed and is getting sucked into the 'out' port
or is water spray getting sucked into the air intake?
Can you inspect the filter after a run where the problem arises
and maybe remove it and try without for a very short run (1/2 mile)?

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