Date: Thu, 16 Feb 2006 08:16:05 -0800
Reply-To: gary hradek <hradek@YAHOO.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: gary hradek <hradek@YAHOO.COM>
Subject: sensor not hot enough
Content-Type: text/plain; charset=iso-8859-1
William,
Look at
http://oem.thepartsbin.com/parts/thepartsbin/wizard.jsp?year=1987&make=VW&model=VAN--003&category=All&part=Catalytic%20Converter&dp=true
The o2 sensor ir really there to protect the Cat from
getting too hot. Most vanagons would run just fine
without an o2 sensor or a cat but they would not pass
smog. In your case I think your problem might be
that the o2 sensor is located too far from the exhaust
stream. If you notice in the california cat they
position the o2 sensor differently than they do in the
other states. Where is your 02 sensor located?
gary
--- WILLIAM GREENAMYER <greenamyer@yahoo.com> wrote:
> I have checked the voltage. Problem is that at
> idle, the sensor doesn't always appear to be
> working. Hard to monitor with any extended leads on
> the sensor. Tried that and the van sucked up gas.
> When driving, everything appears to work. Problem
> is getting the sensor hot enough to function during
> a smog check. The sensor is not monitored for
> function. Neither is the exhaust temperature to
> make sure that it is hot enough for the cat to even
> be functioning (also needs about 600 degrees before
> it starts working). At one place where I used to
> get the smog done, they used an IR thermometer to
> measure the cat to make sure it got up to
> temperature. It took over 30 miutes of running
> before the cat got hot enough to run an accurate
> test. Car passed. Prior to that, it would not
> pass. The new fancy automatic testers don't give
> you readings like the old testers used to. It tells
> you what to do and runs the test. Then you get a
> printout with the results which have already been
> reported to the DMV. You don't know if you passed
> or failed until then. The mechanic never checks to
> see if anything is working or if the temperature
> gets up to the proper level. I was just looking for
> a way to remove outside influences from the O2
> sensor since most vanagons will pass smog without a
> cat if the rest of the system is functioning
> properly. With a self heated O2 sensor, I figured
> it would give me a better shot at passing the first
> time because I could run the test myself at home
> using the CO meter and measure the O2 sensor for
> different operating conditions and know that it is
> getting warm enough to function properly. Was my
> assumption wrong?
>
> William
>
> gary hradek <hradek@yahoo.com> wrote:
> William,
> I would not switch as your single wire sensor
> is not the problem. The heater on the sensor does
> not really heat the sensor up hotter just sooner.
> Have you measured the output voltage of the sensor
> when the engine is hot? I would look elsewhere for
> the problem. but if you like I will look at the
> Bocsh
> ford sensor that I bought for my vanagon and give
> you
> a part number. gary
> Message: 2
> Date: Wed, 15 Feb 2006 13:41:58 -0000
> From: "GREENAMYER" <greenamyer@yahoo.com>
> Subject: oxygen sensor question
>
> First, what happened to the old list?
>
> On oxygen sensors, I am looking at changing my
> 1984GL
> sensor over to a
> heated sensor. Anyone got a part number and wiring
> for this? I am
> guessing it will end up being a 2 or 3 wire assembly
> (rather than the
> present single wire setup) but some of those
> existing
> 2 and 3 wire
> assemblies don't have the heater. I need a heated
> sensor. For some
> reason, my van just doesn't seem to consistantely
> get
> hot enough
> (especially at idle) to get up to temperature to
> trigger the sensor to
> operate.
>
> William
>
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