3 things come to mind for me:
1/ moisture in your distributor.
2/ the power wash disconnected a vacuum line.
3/ you've got water creating a short somewhere.

bob

On Sat, Jan 23, 2010 at 1:23 PM, mordo <helmut.blong@gmail.com> wrote:

> Citizens,
>
> I've revisited this issue finally. I've done some testing and I'm still
> baffled.
>
> Summary:
>
>
>   1. Seemingly coincident with the aforementioned powerwashing escapade,
>   the engine will not cold start without applying some throttle and will
> not
>   hold idle without holding the throttle open slightly.
>   2. Once warm(and not even completely warm), the engine runs well; it will
>   even hold a slightly wandering idle at stop (800-950 rpm).
>   3. I've tested the ISV and it snaps open and closed smartly. However, it
>   does not hum at all when the engine is operating.
>   4. I've tested current at the ISCU, it's there. So, ISCU is bad is the
>   diagnosis?
>   5. I've tested the TPS for adjustment and current. 5 volts at the
>   connector, as specified
>   6. I cannot find any other component amiss - vacuum, electrical or fuel.
>   7. Even after sitting for weeks, the engine starts immediately if I give
>   it a little throttle.
>
> Questions:
>
>
>   1. What is likely to be at fault given these circumstance? Fuel?
>   Ignition?
>   2. Does the ISCU figure into the cold start operation?
>   3. If the engine will idle decently without an operational ISCU and ISV,
>   what will happen if I input a working ISCU?
>
>
> Any ideas, anyone?
>
>
>