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[16v] DPR/mixture/timing questions



Do you mean the ignition coil, or is there an internal coil in the DPR? 
  Same thing happened with both DPRs, and the O2 sensor is new.

"Your o2 may actually be bad, at least after reading the part about 
dropping to 0mA with ~.5 volts"

Originally, I had my test rig set up, and the DPR read 0.0mA.  I leaned 
it out, and got it to .5mA (spec'd by Bentley as a good average), then 
with no warning, it dropped back to 0.0mA.  I didn't check the voltage 
at the O2 sensor at the time.
Nate





Allyn wrote:
> Your o2 may actually be bad, at least after reading the part about dropping to
> 0mA with ~.5 volts. That seems to me that there is no feedback somehow.
> Actually, the DPR itself could be bad (but the coil still in tact), breaking the
> feedback loop, causing the current to swing one way or another, all the while
> causing the car to run like crap.
> Al 
> 
> 
>>-----Original Message-----
>>From: Nate Mellom [mailto:doubt@inwave.com] 
>>Sent: Monday, March 06, 2006 10:55 PM
>>To: roccit_53@scirocco.cs.uoguelph.ca; Scirocco list; Allyn
>>Subject: Re: [16v] DPR/mixture/timing questions
>>
>>Yep, I know it's indicating full rich, which I understand, 
>>and can adjust via the mixture screw (which I've done).  What 
>>I DON'T get is why, while adjusting the mixture, and having 
>>set it to averaging .5mA, it dropped to 0.0mA (full rich) 
>>with no input from me, never to return to a reading at all.  
>>Like I said, the mixture screw was turned ALL the way righty 
>>richy (originally showed 0.0mA), and I leaned it out and had 
>>it good.  Still revved crappy, but then blammo, 0.0mA.
>>I'll play with it some more this weekend, just out of 
>>curiousity, how many turns lefty leany can I expect to adjust 
>>the mixture?  I've read to turn it 1/8 revolution at a time, 
>>but I think when I leaned it out I was at least a full half 
>>turn, just wondering if I should continue leaning it out a 
>>full turn or more.  When I did lean it more than a half turn, 
>>it stumbled and would barely idle, but still reading 0.0mA.  
>>Which got me thinking that the morons who worked on it before 
>>I did adjusted the timing with a bad O2 sensor and a full 
>>rich mixture, just to get it to run half-way good.
>>Nate
>>
>>Oh, and for the record, I tested my DPR for resistance, 
>>(Bentley spec'd
>>18-22 ohms as acceptable), and mine tested out at 18.2 ohms, 
>>I replaced it with a used boneyard DPR which tested out at 19.4 ohms)
>>
>>One thing I didn't think of, while testing contunuity at the 
>>O2 sensor control module, was to turn the ignition on.  The 
>>other electrical tests shown in the chart specified whether 
>>or not to turn the ingition on or off, this one didn't.  
>>Maybe that'll be my next step.
>>
>>
>>C Boyko wrote:
>>
>>>I can't speak to the continuity tests, as I haven't done them, (and 
>>>obviously wiring is pretty important...) but both DPR and O2 sensor 
>>>are indicating full rich, on the O2 rich reads high, DPR reads low 
>>>IIRC. (since DPR current is just an adjustment value, and 
>>
>>it doesn't 
>>
>>>need to adjust anything if it's already too rich) What do 
>>
>>your plugs 
>>
>>>look like? I'm just wondering what happens if you turn your handy 
>>>Allen key "lefty leany" (not "righty richy", LOL) on that 
>>
>>airbox mix 
>>
>>>screw. Is it possible that the DPR just can't do anything 
>>
>>about the rich condition?
>>
>>>Cathy
>>>
>>>
>>>
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