[urq] Was engine stumbling

[Buchholz, Steven]

... that is the one!

While there are numerous benefits gained by switching to EFI, just
because the driver for the OXS Freq Valve is intermittent does not mean
that you need to toss the ECU ... they can be repaired ... 

Steve B
San Jose, CA (USA)
> 
> The freq. valve is the black one right next to the fuel distributor
> right?  I call it "the buzzer".  Now that my exhaust leaks are fixed
> and my valves adjusted, I can actually hear that thing inside the car.
> 
> I put a new O2 sensor in the car when I did the head work.  In
> general, the car idles much better than it did before (~850 rpm when
> warm, it was never over 750 before).  It has more power and better
> throttle response as well.
> 
> I'm hoping that I just have a few sensors that are old and failing. 
> If the ECU is starting to go, it's 034efi time.
> 
> 
> On Tue, 7 Dec 2004 07:46:23 -0800, urq <urq at pacbell.net> wrote:
> > ... this may be the driver for the OXS Freq Valve not 
> working all the time
> > ... or perhaps something with the OXS ... you might want to 
> monitor the
> > voltage on the OXS when this is happening.  If the OXS 
> doesn't react until
> > after the event I'd suspect the driver in the ECU.
> > 
> > Cheers!
> > Steve B
> > San Jose, CA (USA)
> > 
> > >  The interesting thing is this:  After the car is warm, 
> it will idle
> > > with the duty cycle where I set it.  But somewhat 
> periodically, the
> > > idle will jump up about 100rpm and the duty cycle will go to 99.2%
> > > (I'm guessing it's full open the multi-meter just isn't reading it
> > > right).  Also, closing the WOT switch doesn't seem to 
> have any affect
> > > on the idle speed (I've read that it should).