[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Homemade O2 Sensors



Techtonics has a harness for the Dwell time on the CIS-E systems...  30.00 IIRC
-- 
Regards,
David Utley
-----------
Cable Volkswagen
405-470-3129
1-800-522-6793


Quoting "James S. Danda" <jdanda@sunflower.com>:

> Thanks, I took off the sensor and re-built the connection using the straight
> tube splice crimp connectors. I removed the platic insulation from the
> connector before crimping the wires. I then re-insulated with heat shrink.
> At this point I can't imagine that connectivty is a problem. Unforn, this
> did not fix my problem.
> 
> Now I guess I'm going to run through the electrical tests outlined in
> bentleys. I've done everything I can think of that is less than $100/part. I
> don't want to chance spending money on a new coil or distributor if I'm not
> 98% convinced it needs replacing.
> 
> My next questions: Where can I buy some 'generic  vw/german' connectors to
> build up the test harnesses required to perform the tests?
> 
> I'm getting real depressed with CIS-E. I have made the decision never to own
> a car again with a hybrid mechanical/vacuum/electric fuel injection built in
> the 80's. Its 70's carbs, or 90's computers for me from
> now onward.
> 
> Jim
> Go Navy!
> 
> ----- Original Message ----- 
> From: "Allyn" <amalventano@sc.rr.com>
> To: "Ron Pieper" <rapieper@yahoo.com>; "James S. Danda"
> <jdanda@sunflower.com>; <scirocco-l@scirocco.org>
> Sent: Tuesday, February 10, 2004 10:54 AM
> Subject: Re: Homemade O2 Sensors
> 
> 
> > > (this opens the solder vs. crimp debate).
> >
> > here, i'll attempt a quick end to the crimp vs. solder debate.
> >
> > crimping or soldering work ALMOST equally well. to understand why you must
> > see how the o2 sensor interface works. the o2 sensor outputs a small
> voltage
> > (~0.5v), and due to the method by which that voltage is made, it is very
> > sensitive to loading. the slightest load will cause the voltage to drop
> > below what it is supposed to be. for this reason, the thing that reads
> this
> > sensor (ecu) uses a circuit with a very high impedance input (similar to a
> > digital voltmeter - which is also the reason that analog meters don't work
> > well reading o2 sensors - as they load the output down too much).
> >
> > ok, so we basically have something making voltage that is very sensitive
> to
> > loading, and its measured with a circuit designed to put near-0 load on
> the
> > device being read.
> >
> > ok, now what all of this tech stuff does for us is show that electrically,
> > it just doesnt matter if you solder or crimp this connection. reason being
> > that since the sensor is read using very high impedance, small differences
> > in resistance of the wiring will have no impact on the voltage reaching
> the
> > ecu. this is because there is ~0 current running through the o2 sensor
> > wires, so changes in resistance of those wires have no impact on the
> voltage
> > reaching the other end (cant have voltage drop across the line when there
> is
> > no current running through it).
> >
> > ok, so we (thoroughly) covered the electrical. what remains is the
> > mechanical. the reason some prefer crimping over solder is because solder
> > joints usually fail. now dont get me wrong, solder IS the superior
> > connection method, but not when it is done improperly. lets face it, your
> > average joe cant pull off nuclear grade solder joints. if you dont
> properly
> > solder this connection, the solder wicks up the wire as its being
> soldered,
> > causing it to be rigid up to the point where the wicking ended. not
> knowing
> > this, the wire is not properly reinforced at the end of the wick, and this
> > junction is allowed to take the bending force of the wire. keep this up a
> > few times and the wire breaks at that junction.
> >
> > ...so its not that solder is bad, its that people shouldnt do it unless
> they
> > are competent enough to do it correctly.
> >
> > Al
> >
> > Allyn Malventano, ETC(SS), USN
> > 87 Rieger Scirocco GTO 2.0 16v (daily driver, 190k, rocco #6)
> > 86 Kamei Twin 16V Turbo Scirocco GTX (30% complete, rocco #7)
> > 86.5 Occo 16v Trailer (rocco #8)
> > 90 Passat GL 16V (the wifes new daily, 200k)
> >
> > ----- Original Message ----- 
> > From: "Ron Pieper" <rapieper@yahoo.com>
> > To: "James S. Danda" <jdanda@sunflower.com>; <scirocco-l@scirocco.org>
> > Sent: Tuesday, February 10, 2004 10:37 AM
> > Subject: Re: Homemade O2 Sensors
> >
> >
> > > Yes, I installed the same Bosch sender in a Cabby some time ago...worked
> > wonderfully.  Did you
> > >
> > > Should be OK...
> > >
> > > Ron
> > >
> > > --- "James S. Danda" <jdanda@sunflower.com> wrote:
> > > > Has anyone had luck wiring up a Universal O2 sensor (ie Bosch 13913)
> to
> > a 16v CIS-E car?
> > > >
> > > > I have one wired and installed, but I'm having problems getting my car
> > to run right. It misses
> > > > under load. In other words when accelerating it accelerates
> erratically.
> > Eventually I reach
> > > > steady speed and it runs great, but while accelerating it has power in
> > bursts. Its like a switch
> > > > is randomly thrown which gives small burst of full power. Otherwise
> > power is at 75%(guess). Oh,
> > > > and it only acts like this AFTER the engine has completely warmed up.
> > > >
> > > > I've done the following in trouble shooting: new filters(air, fuel),
> new
> > injector seals, new
> > > > plugs and wires, checked for vacuum leaks, and built a new o2 sensor.
> > > >
> > > > I'm beginning to think its the o2 sensor, but like an idiot I threw
> the
> > old one away so I can't
> > > > test it. It ran ok before changing my downpipe. While installing the
> > downpipe I figured I'd
> > > > replace the o2 sensor. I really don't want to spend $125 on an OEM
> > sensor, but if that gets the
> > > > car running right I'll start saving.
> > > >
> > > > Thanks,
> > > > jim
> > > > _______________________________________________
> > > > Scirocco-l mailing list
> > > > Scirocco-l@scirocco.org
> > > > http://neubayern.net/mailman/listinfo/scirocco-l
> > >
> > >
> > > __________________________________
> > > Do you Yahoo!?
> > > Yahoo! Finance: Get your refund fast by filing online.
> > > http://taxes.yahoo.com/filing.html
> > >
> > > _______________________________________________
> > > Scirocco-l mailing list
> > > Scirocco-l@scirocco.org
> > > http://neubayern.net/mailman/listinfo/scirocco-l
> >
> 
> 
> _______________________________________________
> Scirocco-l mailing list
> Scirocco-l@scirocco.org
> http://neubayern.net/mailman/listinfo/scirocco-l
>