bad o2's? - TCCoA Forums
 
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post #1 of 14 (permalink) Old 12-05-2006, 08:19 AM Thread Starter
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bad o2's?

i am getting a check engine light that comes on a few minutes after firing it up, but before reaching full operating temperature, then it goes away. it also comes on while traveling 75-80 mph and stays on until i slow down to about 70. my gas mileage seems a bit weak, too. finding an obd1 code reader around here to borrow is a chore, and i need a quick diagnosis. does this sound like bad o2 sensors?

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post #2 of 14 (permalink) Old 12-05-2006, 09:25 AM
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I am not sure about your diagnosis, but do you know about grounding one of the pins on the OBDI port and counting the flashes? I did it to my '93 Ranger and it was a pain in the butt but it does work and you don't need a reader.
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post #3 of 14 (permalink) Old 12-05-2006, 09:33 AM Thread Starter
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yeah, i heard of that trick and i got a thread going about that. not much help so far cuz i need a pic.

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post #4 of 14 (permalink) Old 12-05-2006, 10:08 AM
 
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Quote:
Originally Posted by big mike
yeah, i heard of that trick and i got a thread going about that. not much help so far cuz i need a pic.




there ya go
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post #5 of 14 (permalink) Old 12-05-2006, 10:25 AM Thread Starter
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what are you using to connect the pins?

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post #6 of 14 (permalink) Old 12-05-2006, 10:27 AM
 
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In the pic its just a piece of red plastic so it would show up better. When I ran the test I used a paper clip, works great.
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post #7 of 14 (permalink) Old 12-05-2006, 10:32 AM
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I have to do pretty much the same thing on my 88 cutlass, except that both pins are in the same harness.

Jim

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post #8 of 14 (permalink) Old 12-05-2006, 10:32 AM
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Our '93, when stock, did the same thing when doing highway trips - it would go on and off with no apparent reason.

If you are good at wiring, you could get these:

http://cgi.ebay.com/ebaymotors/NEW-M...mZ160030691132

We bought from this place for sensors for our Exploder....works just fine.

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post #9 of 14 (permalink) Old 12-05-2006, 07:30 PM
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Does it drive better cold or after warm up, does it bog under WOT? Though intially it does sound like O2.

To pull EEC-IV codes jumper the top right plug of the larger connector with the small connector.

If all else fails get a bigger hammer!

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post #10 of 14 (permalink) Old 12-08-2006, 11:57 AM
 
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Any luck with the codes Mike?
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post #11 of 14 (permalink) Old 12-08-2006, 12:08 PM Thread Starter
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i cant tell a difference whether its cold or warmed up. no bogging under full throttle.

i havent pulled codes yet.

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post #12 of 14 (permalink) Old 12-08-2006, 05:35 PM
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Mike, either pull the codes or get a volt meter on the O2. Only other thing else I could come up with is MAF, but I lean toward O2. If so hurry up and change them and stop getting my headers dirty.

If all else fails get a bigger hammer!

93 SC Tbird
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post #13 of 14 (permalink) Old 12-08-2006, 05:39 PM
 
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Sounds exactly like what my truck was doing. Changed the 02 today and all is well
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post #14 of 14 (permalink) Old 12-19-2006, 08:47 AM Thread Starter
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Quote:
Originally Posted by bowez
stop getting my headers dirty.
dont tell me that. i sold them along with my entire exhaust

yeah, late reply. sue me

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