On Thu, Jun 21, 2012 at 4:10 PM, David Beierl <dbeierl@attglobal.net> wrote:

> Nope.  Once it goes into deceleration mode it's done, the engine is not
> running.

Ok. Thanks!

Simple test is put a voltmeter on the O2 sensor (or one of Ken Lewis's neat
> little LM3914 bar graph indicators which unlike a DMM are very fast
> reacting and make excellent little monitors to stick in the panel somewhere
> like the spare switch cover).  If the decel mode is working properly the
> sender will go to ~0 output.  Or use a 'noid light on an injector.  But for
> monitoring that switch and general closed-cycle/O2 sensor behavior from the
> cockpit, Ken's little dingus is the way to go.  Personally I'd rig it with
> a shielded cable like RG-174, grounded at one end like the wire from the
> ECU is.  That way you won't be putting a CB antenna on your oxygen sensor.
>

Yes! Mark Drillock had mentioned Kens' device here or on thesamba forum.
And one can take power from the rear defogger for it.

> The other cockpit on the closed throttle switch on the 2.1l engines is the
> idle.  Normally when you close the throttle (vehicle stopped) the rpm drops
> to a bit over a thousand for a couple seconds, then makes a distinct drop
> to its final rpm.  If the switch doesn't close, it will stay a little
> higher than the usual first step and be a bit unstable.
>

Ok. Good to know. Not sure if idle does that, engine warm. However. Engine
cold, I have seen a similar behaviour. I'll watch for that, engine warm.

I really have to wonder if there's enough play in the engine mounts and/or
transmission mount, that a cycle of movement happens in the drive train
that pulls on the accelerator cable, causing the throttle valve switch to
open when decelerating. I have purposely left a little slack in the cable
to compensate but this may not be helping.

Neil.

--
Neil n

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