[DML] Re: Running Problem-Rich Mixture

["dukeofclassiccars" <tswatch@xxxxxxxx>]

Hi Elvis,

I only replaced parts that were tested bad and didn't work.  The 
voltage was tested on 20v from oxygen sensor lead to a ground.  I 
think I am getting feed back because when the O2 sensor is 
disconnected, I get around .5v.  As for the vacuum leak, not sure.  
I've checked everything.  However, it only began after doing a tune-
up on her (spark plug wires, distributor cap/rotor, etc).  So my leak 
should not be hard to find.  One last question that could solve my 
problem.

How EXACTLY does the Idle Speed Motor work.  Does it read off the 
RPM?  Air Intake?  Temperature?  Where does it get its signal that it 
is opening up all the way?  Could a vacuum leak really open it that 
much?  I don't have to open the manual valve that much to get her 
running smoothly.  I checked all the wires and replaced everything in 
the Idle Speed system, except the ECU unit.  Which I am probably just 
going to spend the money.  I know these don't go bad often, but I 
think it's my last resort.  BTW, everything was bad in the Idle Speed 
system except the thermistor under the inlet manifold.  I just 
decided to replace it so I wouldn't have to pull the manifold off 
again (hopefully).  If I figure out exactly how the Idle Speed Motor 
works, (I'm having trouble figuring it out via the workshop manual) 
then I would be good to go.

Thanks again everyone... car is almost done.

~Dan
3817 - Born Again.
(Would I do it again... HECK YA!)

--- In dmcnews@xxxxxxxxxxxxxxx, "Elvis Nocita" <elvisnocita@xxxx> 
wrote:
> Dan,
> I don't understand why you don't wanna hook up the idle speed 
system.
> Don't listen to all those horror storys about that system because it
> works when the parts are ok. I told you before - check your wiring 
harness,
> maybe there's a broken wire or something.
> 
> For your O2 sensor - where and how do you measure the voltage ?
> What kind of tools do you use to measure it ?
> I know, stupid questions, but I've seen a lot of sh.. done by people
> who don't know anything about electricity.
> Try to unhook the O2 sensor and measure again. It's possible that 
the
> computer feeds a voltage back because something inside is damaged.
> 1.8V is really too much, I'm not sure if or how the sensor should
> produce that itself. From the theory of how a O2 sensor works it
> just can't be it, it must be the computer or your ground where you
> measure an offset due to a bad connection.
> 
> Please don't start to throw parts out of the car just because you 
think
> they will never work. They do work and most times it's really just a
> small and simple problem that needs some investigation.
> I heard of so many cars where the new owners pulled out up to 20m 
(60feet)
> of extra wires that a former owner installed because he didn't know
> anything about the car or because he thought he was smarter then the
> engineers who built and designed it. After pulling them out and 
setting
> everything how it belongs to - everything worked fine.
> I know you can do it better, you already put her back to live,
> the rest isn't that hard anymore.
> 
> Let me know if you need any electrical assistance or a good 
schematic.
> 
> Elvis & 6548
> 
> 
> 
> Problem solved!  I just need to cut the air back manually EVERYTIME
> when I want to drive her!  I could just fix my idle speed motor
> problem (which I'm really trying to avoid because I'm trying
> to find a way to work around it so I will never have to use it).
> What about my oxygen sensor?  Well, it always reads at 1.8 volts 
(and
> it should be at 0.5 - 0.7 volts).  I can't figure out the answer
> to
> this one yet (and I know it is simple, I just think my mind is fried
> from working on everything else on the car).  If it has a higher
> voltage than it should, does that mean it is getting too much 
oxygen,
> or too little?  I played with my CO adjustment screw and my air
> valve; nothing would change my reading on the oxygen sensor.  My 
only
> guess is that I have another bad wire somewhere (or ground).
> 
> 
> ~Dan
> VIN# 3817 ? Born again.




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