Universal O2 Sensor
 

Eurospec944, is there a part number for the universal O2 sensor that you said cost between $45 and $55? Where can I pick one up and is it a Bosche? GRP has one for $69, this is the best price I've seen for a 3 wire sensor. If I can source one locally I would rather do that. One place I went to, asked about lenght and thread size ???

Will the universal one work properly, as I need to past the dreaded smog test.

Mark
'86 944NA

bump

Bosch no e, part number is 13913.

Thanks, Booster I'll check it out ASAP!

Mark
'86 944NA

Get the 4-wire from Jason at paragon products for around $35.

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Erick

86 951

http://www.pelicanparts.com/cgi-bin/pmpre/pm.cgi?action=display&login=aka_951

The universals work fine. Are you talking US or Canadian dollars? If those are canadian dollars, thats too much.


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Gordon
1981 924 N/A

I just picked up a Bosch 13913 at PEPBOYS for $44.95. it has 3 wires.

Next Question: Will I have to do any modifications to the connector or anthing else to make everthing work ?

Mark
'86 944NA

bring it back and get the 4-wire from paragon for less.

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Erick

86 951

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If I order the 4 wire from paragon, after paying shipping and handling it may work out to be about the same and I will have to wait over a week at least for it to arrive.

What is the advantage of getting a 4 wire versus a 3 wire ? I was told that my '86 uses a 3 wire O2 sensor would the 4 wire or 3 wire fit without modification to the connector ?

Mark
'86 944NA

Get the three. Four wire is useless. I have the three and still run a lindsey racing air/fuel meter without any problems. Save a buck. Three wire will drop right in. You have two whites, they are the heater wires, and one larger black thats the signal wire, just match em up. If you have to cut the plug do it, just insulate it well when you patch it together.

Thanks Scott, I gonna work on the car this weekend.

Mark
'86 944NA

Wow..Scott, how is the 4-wire useless? Its more accurate and heats faster due to the 4th wire being a ground.

Isn't the 4-wire what the newer cars have to help meet OB2? A lot of tuners including huntley are using them also. Further, they're relatively economical when bought through the aftermarket.

To hook up the 4th wire just ground it to the chassis - its pretty simple. My personal experience has been that the output sensors on the 3-wire sensors flucuate more often than 4 wire. Also, accesories don't affect the 4 wire voltage output for the most part. Further, the output signal is quick to stabilize due to the quicker heating.

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Erick

86 951

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The 951 86 model has a 3 wire. White White Black color for color. Splice to your old connector as it is a lot longer.

Most auto stores have the 3 wire and they are fine to use, forget the 4 wire. If you were to buy the Porsche O2 it would be the three wire for oh 180!, save a buck or two! You will never know the difference.

Here's my 2 cents worth--I just put in a Bosch 3 wire universal. As you've all noted, it was way cheaper. One black and two white wires. My contribution to the original question would be to get the old sensor out (I used some PB Blaster, its great stuff for old rusty parts). Then follow the wire up the firewall and unplug from a connector. Take it all to the work bench where you can stand up and do the work. Just cut off the old one, splice in the new. I found that it went better if I screwed in the new sensor before attaching the connector in the engine compartment because the wire twists a lot getting threaded.


My reason for doing this job on my car was I was pretty sure it had never been changed in 104,000 miles. It indeed was very cruddy. And, the "miss" I was having at low/constant throttle speeds has seemed to have gone away.
Curtis

Trust me on this one - the 4-wire for the same price (from Paragon) is the way to go, especially if you have a turbo and are running it on the edge. It seems simple to me as it is more accurate and heats up quicker. I guess you have to be pushing a car to the edge to appreciate the difference.

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Erick

86 951

http://www.pelicanparts.com/cgi-bin/pmpre/pm.cgi?action=display&login=aka_951

4 wire is still useless, it may be faster but your DME/Computer is still 80's technology and it's always going to be slow to correct. Your bottleneck will still be in the processing of the signal from the O2. OBDII is still slow by all accords. The new ODBIII will incorperate two and sometimes three seperate O2 sensors for better accuracy, but your 80's 944 is just fine with a single three wire.

Scott, you're missing the point. At high rpms your DME doe not use the O2 sensor. At high rpms, the DME runs in "open loop mode" where it operates on a set of pre-programmed tables. The 4-wire is advantageous because it gives you the user a more accurate signal to your a/f meter. In other words, you can adjust your fuel pressure regulator so as to "richen" the mixture up enough to avoid knock and get maximum power. The increased accuracy is due to the extra ground wire that the 4-wire incorporates. I've been down this road before with my 951 and I'll take any advantage I can get. You should too.

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Erick

86 951

http://www.pelicanparts.com/cgi-bin/pmpre/pm.cgi?action=display&login=aka_951