DPR current/O2 sensor voltage

[amalventano at sc.rr.com (Allyn)]

the o2 reading and the DPR reading dont make sense. if the o2 was running 
that lean, the DPR should be pegging high (about 20mA, not fluctuating) in 
an attempt to compensate. you can try to nudge it down to the 5-10mA range. 
if it hangs out between 5-10mA with minor fluctuation, chances are your o2 
is working just fine. if it was actually bad, the feedback loop would be 
broken, and you would likely have no fluctuation of the DPR current.
Al


----- Original Message ----- 
From: "C Boyko" <roccit_53@scirocco.cs.uoguelph.ca>
To: "Allyn" <amalventano@sc.rr.com>
Cc: "scirocco list" <scirocco-l@scirocco.org>
Sent: Monday, September 20, 2004 9:15 PM
Subject: Re: DPR current/O2 sensor voltage


Okay, a revision, gotta love the whole "fleet" syndrome. Testing the
Beetle's battery prior to a trickle charge revealed it to be at 17.4V, and
it wouldn't start, so a multimeter "tech procedure" was in order. A trip
to town, and new battery/fuse for the meter reveals that the DPR is REALLY
at 9.9-11.2 mA. And the O2 is between .32 and .03V. Mostly around .04 or
so, with occasional blips to tenths of a volt.

SO>>>the O2's indicating lean, or that it's dying/ dead, and the DPRs
indicating rich, correct? So replace the O2 sensor and tehn check the mix
again? Or gently CCW on the mix to get it in the 5-10mA range? What say
ye? (I'm going back under her, aren't I? Figured as much)

And one more thing, assuming the 16V "Passat convertible" has a decent O2
sensor, it's sensor will work, right? (That I can look up)

And thanks once again.

Cathy
16V Scirocco and some other stuff that won't start....


> DPR needs to be fluctuating (within about 5mA), and should average about
> 5-10 mA. sitting stuck at .1 and .2mA makes me think its riding out of
> range.
> as for which way does what -
> high DPR is rich (cold start enrichment is ~60mA). however, a low DPR
> number
> at idle (close to 0mA), means that the mechanical adjustment is too rich
> itself (computer is compensating in the lean direction). as far as
> adjustment, CW = rich, which causes DPR to go DOWN (cpu adjusts in the
> lean
> direction, towards 0).
>
> for your situation, you should go CCW, and it shouldnt take much, since
> your
> o2 sensor is close to .5 anyhow. ensure there is nothing attached to the
> o2
> sensor while adjusting the DPR.
>
> hth
> Al
>
> ----- Original Message -----
> From: "C Boyko" <roccit_53@scirocco.cs.uoguelph.ca>
> To: <scirocco-l@scirocco.org>
> Sent: Monday, September 20, 2004 6:32 PM
> Subject: DPR current/O2 sensor voltage
>
>
> Okay, I've looked in the Bentley, and can't find it, and figured someone
> could give me a quick answer.
>
> I'm wanting to adjust my mix on the 16V, and finally got a harness hooked
> up to measure DPR current, right now it's fluctuating between .1 and .2 mA
> and I seem to remember the goal being just rich of .5 if I could remember
> whether higher is richer or leaner. I know it's "righty richy" on the
> Allen key.
>
> So question one is does low = rich or lean, and what's the target value?
>
> Anyway, I'll check the O2 input first, it should be 5ish too, on whatever
> voltage scale, right? (0 being dead and 10 being full rich?) I have it
> written somewhere, but it's been two years since I last checked it. Sorry
> to be so non-technical here, but the car feels like it wieghs 4000 lbs at
> the moment, I'd like to reduce the dog factor. It's gotta be near where it
> can't adjust out of it.
>
> That makes question two "what is ideal value for the O2 signal?"
>
>
> Thanks.
>
>
> Cathy
> 1987 2L 16V Scirocco - the Silver Headache
> 1979 1.8L 10:1 8V - Klaus- sounds like 0.33 of a Chevelle
> "The light at the end of the tunnel is probably an oncoming train"
>
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> Scirocco-l mailing list
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>
>


Cathy
1987 2L 16V Scirocco - the Silver Headache
1979 1.8L 10:1 8V - Klaus- sounds like 0.33 of a Chevelle
"The light at the end of the tunnel is probably an oncoming train"

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