Re: 2000 RPM knock

["Green" <green@dsl.telocity.com>]

Good work Barry...

I wonder if this problem is common on syty's ?  maybe find a solution to
this one and check for it on other trucks..

later
BG


> To make a *real* long story short, the false knock I was getting @ 2000
> RPMs is really that - but its coming from within the ECU.
>
> Disconnecting the knock sensor completely results in no knock (naturally),
> but sets the ESC code.  No surprise there.
>
> However, simulating the resistance of the KS w/ a 3.9k resistor (value of
> the KS is 3.7k), connected to the KS wire (cut at the ECU), gives the same
> strong knock @ 2000 revs.
>
> So, its getting into the ECU or originating there.  Tomorrow's project is
> to 'scope all the I/O lines to the ECU.
>
> Anybody had a similar experience?
>
> No wiring changes were made at any time during the past few weeks engine
work.
>
> Thanks - Barry
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