o2 sensor prob fixed.. Warning about wd-40
Chris Ng
volts while connected, and no fluctuation.. if I leaned out the mixture, it
would fluctuate between .4 and .5 volts and the car would run rough..
The new sensor once connected showed .9 volts and no fluctuation.. I leaned
out the mixture until I got a fluctuation between .15 and .75 volts.. the
car now runs wonderfully like before..
How did I get into all this mess? I used WD-40 .. I cleaned out my Idle
stabalizer with carb cleaner then used some WD-40 to lubricate... PLEASE
don't make the same mistake I did.. the WD-40 rendered the sensor useless in
a very short time (within 3 mins of reconnecting the sensor) ... I have
learned my lesson..
A tip for Canadian vw owners as well.. I called around everywhere to try and
locate a o2 sensor locally.. prices ranged from $89 for a universal sensor
(which would have had to be spliced) to $198 for a Bosch Sensor from the
dealer.. Napa wanted $114 for the Bosch sensor for Fords that work with Vw's
(Woul have to splice that one as well)..
Then I tried Canadian Tire.. $125 for a Neihoff 3 wire o2 sensor.. no
splicing required.. I took my chances and had them bring one in (took a day)
hopeing that it would be as good as the Bosch sensors ... To my surprise
when I opened the box the sensor was in, it was in fact a Bosch unit... I
really doubt you'll find these sensors any cheaper anywhere else locally..
so when in doubt, head to canadian tire..
Thanks to everyone for their suggestions about my sensor troubles..
Now, could someone explain to me how the MFA gets it's info to work out Fuel
consumption? My MFA displays overy optimistic fuel milage.. around 1.5
l/100kms... I'd like to see if I can get it to read correctly..
Chris
Franco Vasta
The engine of my Passat G60 does not push enough; it also has some problem in
idle stabilization when the Air Conditioned is on. I tried to clean the ISV (at
least I think it was the ISV! I apologize, I am a very beginner! Is it that
cylinder shaped thing, connected to two manifolds and an electrical connector,
placed on the top of the engine body?), but with no success. Yesterday I tried a
Passat G60 of 1991, and there was no comparision between the performance of that
car and mine! I bought my passat 2nd hand and I never tried a G60 engine
before... but now I know how much such an engine can push! So I am tying to find
out where the problem can be located in my Passat. Since I have also that idle
problem I would start from the Oxigen sensor which, I understood can also give
idle problems.
Big Question: where is it located in my passat GT G60 of 1990? How can I
recognise it? How can I check if it works properly with a Voltmeter?
Many many thanks.
Franco, Italy.
Simon Burtsal
consumption:
- Intake manifold pressure
- Engine RPM
- Wheel speed, from the gearbox final drive
From the first two it works out the fuel flow rate, then from flow rate and
wheel speed it can work out the consumption.
It assumes that the motor is standard (no mods that will affect fuel flow
rate vs. intake pressure) and that the motor is in good tune.
Questions for the real experts out there...
Is the O2 sensor really the right one ? correctly calibrated for the ECU ?
Could the O2 sensor still be incorrect and fooling the ECU to run the fuel
micture rich ?
or do they all give the same output ?
Simon B.
'91 8V GTI (UK) 116K
Chris Ng wrote in message ...
awh...@ummed.edu
"Chris Ng" <chr...@shaw.wave.ca> wrote:
> Well I swapped out my o2 sensor this afternoon.. My old sensor showed .6
> volts while connected, and no fluctuation.. if I leaned out the mixture, it
> would fluctuate between .4 and .5 volts and the car would run rough..
> The new sensor once connected showed .9 volts and no fluctuation.. I leaned
> out the mixture until I got a fluctuation between .15 and .75 volts.. the
> car now runs wonderfully like before..
>
> How did I get into all this mess? I used WD-40 .. I cleaned out my Idle
> stabalizer with carb cleaner then used some WD-40 to lubricate... PLEASE
> don't make the same mistake I did.. the WD-40 rendered the sensor useless in
> a very short time (within 3 mins of reconnecting the sensor) ... I have
> learned my lesson..
>
I fail to see how using WD-40 on the idle stabilizer could have an effect of
the O2 sensor. There should be no correlation between the two, other than
that a faulty idle stabilizer might make the O2 sensor go bad over time, due
to idleing too rich or something. I used WD-40 about 2 weeks ago to clean out
a sticking stabilizer, worked fine with no harmful after effects (89 GLI
16V). a
-----------== Posted via Deja News, The Discussion Network ==----------
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Chris Ng
>
>I fail to see how using WD-40 on the idle stabilizer could have an effect
of
>the O2 sensor. There should be no correlation between the two, other than
>that a faulty idle stabilizer might make the O2 sensor go bad over time,
due
>to idleing too rich or something. I used WD-40 about 2 weeks ago to clean
out
>a sticking stabilizer, worked fine with no harmful after effects (89 GLI
>16V). a
>
The ISV is an air bypass valve.. the excess wd-40 is carried into he engine
along with the air and goes thru combusion.. the emissions burnt up WD-40
releases is sent out the exhaust and into the path of the o2 sensor.. the
sensor doesn't like whats in this exhaust stream and dies..
Much like why fuel additives need to be o2 sensor safe.. they get
introduced in the fueling end of things, while the wd-40 would be introduced
thru the air end..
Chris
Nov141992
From: awh...@ummed.edu
Date: Tue, Oct 20, 1998 14:02 EDT
Message-id: <70ij79$vul$1...@nnrp1.dejanews.com>
In article <FUhW1.1555$rj5.2...@news.rdc1.ab.wave.home.com>,
"Chris Ng" <chr...@shaw.wave.ca> wrote:
> Well I swapped out my o2 sensor this afternoon.. My old sensor showed .6
> volts while connected, and no fluctuation.. if I leaned out the mixture, it
> would fluctuate between .4 and .5 volts and the car would run rough..
> The new sensor once connected showed .9 volts and no fluctuation.. I leaned
> out the mixture until I got a fluctuation between .15 and .75 volts.. the
> car now runs wonderfully like before..
>
> How did I get into all this mess? I used WD-40 .. I cleaned out my Idle
> stabalizer with carb cleaner then used some WD-40 to lubricate... PLEASE
> don't make the same mistake I did.. the WD-40 rendered the sensor useless in
> a very short time (within 3 mins of reconnecting the sensor) ... I have
> learned my lesson..
>
<snip>
I fail to see how using WD-40 on the idle stabilizer could have an effect of
the O2 sensor. There should be no correlation between the two, other than
that a faulty idle stabilizer might make the O2 sensor go bad over time, due
to idleing too rich or something. I used WD-40 about 2 weeks ago to clean out
a sticking stabilizer, worked fine with no harmful after effects (89 GLI
16V). a
-----------== Posted via Deja News, The Discussion Network ==----------
http://www.dejanews.com/ Search, Read, Discuss, or Start Your Own
</PRE></HTML>
***********************************
I know that certain types of silicone sealant used on an engine will ruin an O2
sensor. Popular Mechanics recently had a small bit on it. It even said that
its use on a pan gasket could do it.
I don't know that WD40 has a similar effect but just want to mention that the
O2 is definetly sensitive to being exposed to certain chemicals.
Tim