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E Test results - ~:(
Right, I was gonna say! ;)
Yep, Cathy you're probably running rich. Whether your cat is okay or not
really depends on how high the numbers are -- and what's causing
them. 16vs can often pass emissions tests without a cat, so if your car is
running properly, you probably wouldn't be too bad even with a
non-functioning cat.
The most likely culprit is the O2 sensor. The computer looks to the O2
sensor to tell it how rich the engine is running. The O2 sensor produces a
small voltage that increases the more unburned fuel is in the exhaust
stream. At 0 volts, there would be no oxygen present at all. The max
your O2 sensor will put out is about 1 volt.
As your sensor ages, it tends to put less and less voltage. If it's
putting out next to no voltage, your computer is going to think that your
engine is running very lean, and so it is going to richen up the mixture
until it sees the O2 sensor values it wants to.
What I would do first is test DPR current if you are able to. If it's not
fluctuating as it should, and is instead showing a fixed value, that means
that something (and again IMHO probably your O2 sensor) is fucked up to the
point that the computer can't compensate for it -- so it just dumps fuel in
in the hope that the car won't run lean enough to damage itself.
I would also check the voltage coming from the O2 sensor -- regardless of
whether you check DPR current. Warm up the car (I'd say drive it around
for a few minutes to make sure that the sensor is good and hot -- it
doesn't work until it's hot), and disconnect the wire to it. Measure the
voltage from the signal wire of the O2 sensor (there are 3 wires -- the two
combined in one harness is voltage for the heater built into the O2 sensor,
the single is the signal) to ground. At idle, you should probably see a
value somewhere around 0.5V if the car is running normally. With your very
high HC readings, I'm suspecting with a good O2 sensor, you should be
looking at a value much closer to 0.9V.
Good luck and HTH!
Jason
At 09:31 PM 10/1/2002, Allyn wrote:
>oh crap, i had it backwards, you're running rich. chart i was reading was
>based
>on excess-air factor, not ideal fuel.
>sorry bout that.
>Al
>
>----- Original Message -----
>From: "Allyn" <amalventano1@comcast.net>
>To: "Cathy Boyko" <losinit@usa.net>; <scirocco-l@scirocco.org>
>Sent: Tuesday, October 01, 2002 9:15 PM
>Subject: Re: E Test results - ~:(
>
>
> > cathy,
> > high co and hc means you're running lean. low nox occurs if you are
> rich
>or
> > lean (looks like a bell curve). ideal air/fuel ratio is where nox peaks and
> > where co and hc hit low numbers.
> > my guess is either you still have some vacuum leaks or your allen
> screw in
> > the cis fuel assembly is cranked beyond the computer-controlled band.
> or you
> > could just have a loose/faulty o2 sensor.
> > Al
> >
> > ----- Original Message -----
> > From: "Cathy Boyko" <losinit@usa.net>
> > To: <scirocco-l@scirocco.org>
> > Sent: Tuesday, October 01, 2002 8:46 PM
> > Subject: E Test results - ~:(
> >
> >
> > Well, the sniffer flunked my car, very high CO and HCs at both idle and the
> > 2000-3000 rpm range, way too high, not even in the ballpark... NOX was
> fine,
> > well low.
> >
> > So does this mean the cat is fine if NOX was okay, and what are the
> most likey
> > culprits? I have to confess I have no clue about tuning this car (
> obviously)
> > And no I didn't get the idle issue fixed, that shouldn't likely hit the
> > "running" part of the test should it? And apparently I'm polluting like
> a mad
> > fiend all the time, not just at idle.
> >
> > This is a 2L 16V, TT exhaust and Euro intake cam. It runs fine (at least I
> > think so, seems to be quick/smooth) except for the idle problem, and it is
> > easy on gas. It idled nicely during the test. Filters, plugs etc are
> all new.
> > I've never touched the mix since the car ran fine, but I have replaced the
> > idle bypass screw, and adjusted the idle using it. Maybe this threw things
> > off. And the little switches on the TB are going to be replaced
> shortly, but
> > I'm not paying the dealer $228 for them.
> >
> > But I'm in a fine mood, since I got to pay an extra $5.00 because the rates
> > changed TODAY, and I can either fix it myself and it HAS to pass, or
> get the
> > local Canadian Tire boys to fix it as much as they can for $200, in
> which case
> > it can continue to pollute for two more years. I'd rather try to figure
> it out
> > and spend the $200 on something other than their labour. And I'd really
> rather
> > not have them touch it actually. So advice is welcome, as always. Just
> when I
> > thought it was running well, this stupid government has to screw me over. I
> > was happy polluting...
> >
> > Not QUITE a pizza rant, but it's close (those at Waterfest will know
> what this
> > means...)
> >
> > Cathy - Unhappily polluting the air in Southern Ontario, but I'm getting 37
> > MPG.
> >
> >
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> >
> >
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