Where's the 02 sensor

[luisbe]

Last tune up was 5 years ago but it's been standing still for almost 1 year and a half, just making it idle once every 2nd week; that was until last year, since then it's been running almost daily.
I have no idea about pins, I'm not a mechanic, just I cannot afford at this time to bring it to one of them.
What would you do for tuning it up?
I've changed all spark plugs and it passed emission test in May/2011.

[LMP]

''94 cannot flash codes nor can be read with an OBD2 scanner....There is a solution using an USB adaptor to a PC. It can be bought online and the software comes with it .
http://www.aldlcable.com/sc/details.asp?item=aldlobd1u
read the notice about 12/16 pin connector. COnnector is at bottom of instrument panel, near hand brake release. Verify number of pins.

MOst of the time, it tells consequences, not causes.....so it might not help that much anyway

ANyway, you have to probe options.
INjectors can be electrically unplugged..just pull the connector at top of injector...easy on front injectors.....more of a problem for the rear...just hope for a miracle up front....but you know my signature...

[luisbe]

Thank you for the info, I'll make a picture of mine later.

[LMP]

here is my '93 connector.

Most probably you have also this 12 pin connector but without pin A or pin B

[luisbe]

That's exactly what I've got.

[LMP]

Originally Posted by luisbe

That's exactly what I've got.

....details..details....my guess is "almost , but not exactly".....pin B does not exist in '94

[luisbe]

It seems the two top pins are the same. Like little white dots at the right top corner.

[luisbe]

Then two pins on the bottom, from right to left first and third.

[LMP]

Originally Posted by luisbe

It seems the two top pins are the same. Like little white dots at the right top corner.

Well in that case, this might be a first series '94.....and maybe....just maybe you could try flashing the codes
..but maybe they just kept using leftovers plugs from '93 with pin B unconnected.......because some '94 were reported like this
--------------
| o o o o o o |
| o o o o o o |
--------------


unfold a small paper clip imto a U , insert into A ans B then turn key ON....if the CEL starts flashing .....verify this:
www.avigex.ca/xport/readingcodes.jpg

...??? Fonthill...near St-Catherine?...

[luisbe]

Yeah, near St Catharines and Niagara Falls.
I'll do that tomorrow then I'll come back with the result.

[luisbe]

I remember years ago in some shop somebody read that with a scanner then they replaced a sensor on the front of the air filter case (MAF?). It was idling rough at that time too.

[luisbe]

Well, finally here is the picture I told you, it seems pretty clear on how it looks.

[LMP]

Originally Posted by luisbe

Well, finally here is the picture I told you, it seems pretty clear on how it looks.

TRy the paperclip into A and B....but though it does have A and B, ...it has also many more pins than my '93.....I doubt it will flash the codes

[luisbe]

Ok, I'll give it a try tomorrow during daylight. Hope it works. Thank you!

[Jrs3800]

If you have a 94-95 with a 3800, you will not be able to flash codes due to the PCM used, there is no diagnostic " Flash " feature in the PCM... Must be read with an OBD1 Scan Tool capable of reading the 94-95 odd ball GM's...