Where's the 02 sensor

[Tech II]

Usually, when there is a "contact" in the "A" and "B" slots, there is flash codes......when one is missing, there isn't.....in this case, they are both there....

[luisbe]

Ok, a question. What can it happen if I bridge it and there's not a data link?
Will it burn a relay or fuse or something else?
I mean, Can I confidently give it a try?
Thank you

[LMP]

No adverse consequence.

[luisbe]

Ok, I dont understand this, here it goes in quantity of flashes until I got tired of writing it down.
3/2/2/2/3/2/1/2/2/1/2/3/2/3/2/3/2/1/2/1/2/1/2/3/2/3/2/3/2/1/2/1/2/1/2/3/2/3/2/3/21/2/1/2/1/2/3/2/3/2/3/2/1/2/1/2/1/2/3/2/3/2/3/3/2/1/2/1/2/1/2/3/2/3/2/3/2/1/2/1/2/1/2/3/2/3/2/3/2/1/2/1/2/1/2/3/2/3/2/3/2/1/2/1/2/1/2/3/2/3/2/3/2/1/2/1/2/3/2/2/2/3/2/1/2/1/2/1/2/...
What does it mean all that?

[luisbe]

Of course I can do it all over again if it has any meaning.

[LMP]

Originally Posted by luisbe

Ok, I dont understand this, here it goes in quantity of flashes until I got tired of writing it down.
3/2/2/2/3/2/1/2/2/1/2/3/2/3/2/3/2/1/2/1/2/1/2/3/2/3/2/3/2/1/2/1/2/1/2/...............

What does it mean all that?

ALL codes are repeated 3 times....when all codes are read, it starts again....ad nauseam...

OK..I start with a 1/2 1/2 1/2 sequence ...which means "ready to read".
then 3/2/3/2/3/2 meaning 32...

then it starts again 1/2 1/2 1/2 ..meaning all codes have been read...the only trouble code is 32....a
nd it will repeat until you are tired.

well....32 is bizarrre...not listed in the '93 flash codes for the 3800...but in OBD2.....it could mean
"P0032 - Heated Oxygen Sensor (HO2S) Heater Circuit High Voltage Bank 1 Sensor 1"

'94 is bizarre, mixed OBD1 and OBD2 ...normally not flashes the codes...and here it gives a flash
code that could point to the first item you had suspected... but a "fail" code is often the consequence
of a problem somewhere else: it could be the O2 sensor itself....or the sensor is ovwewhelmed by a
blocked injector, for instance..

.. keeps me thinking the O2 sensor is NOT the culprit: only the victim : when O2 sensor has gone haywire, , the computer will NOT rely
on this reading and will use a "default mode"...running the engine with "average" values which offer an acceptable
performance...which is obviously not what you describe. If in fact the computer tries "average" values but another component is faulty,
it cannot achieve "average" performance.

[luisbe]

Thank you for the help. Now I've got a question.
I've replaced the front, and visible, 3 spark plugs no long ago but I did not change the ones I've got to go under the van to do so.
Maybe, and just maybe, one of those is not good so you'd be right in that case that the code is deceiving since it could be an injector misbehaving.
I think my best bet now is replacing those spark plugs and see what happens.
Appreciate your patience and feedback.

[LMP]

May be you found my thread about the rear plugs.....there are other options but I found this one easier...with a pit to walk under....will try to locate the link...
...ahhh..here it is http://www.automotiveforums.com/vbul...d.php?t=599442

[luisbe]

Thank you very much.

[Tech II]

On OBD I, code "32" involves the EGR....

[LMP]

Originally Posted by Tech II

On OBD I, code "32" involves the EGR....

YOu are right..it shows on the '93 3.1 code list ..However, with the '93 3.8, EGR codes are 54,55,56 for the 3 section EGR valve, and with the proportional pintle valve used from '94, I do not know which OBD1 code would come, but OBD2 would be P1406....
This '94 is mind boggling....

luisbe....can you identify which EGR valve you have...?
this one
or this one

[luisbe]

Ok, Sorry about my ignorance on the matter.
What does EGR stand for?
and where is it in the engine, can I see it from the front of the engine?

[luisbe]

After saying that, I don't think I have anything looking like to the picture on top in my engine although I cannot find it to compare either.

[luisbe]

Exhaust Gas Recycling, one is answered (thanks google). Also says is located on the intake manifold.
May I ask you if I have to remove something to see it?
Thank you, and again do not forget I'm a neophyte regarding to all this so pardon if the questions sound too stupid at times.

[LMP]

It is on the front of the engine, clearly visible on the driver side, just past the valve cover.
Can you post a picture of your engine compartment....also...please can you confirm the car is actually a '94....maybe a photo of the whole vehicle would dissipate some doubts....