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Old 08-31-2003, 09:42 AM
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Service Engine Soon

HAVE A 1990 CHEVY BLAZER 4.3 WITH SERVICE ENGINE SOON LIGHT ON IN YELLOW. ANYONE KNOW HOW TO CHECK WHAT THE PROBLEM MAY BE. THANKS

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Old 08-31-2003, 09:53 AM
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You really need to have it Scanned at a shop and have them what codes are and what is needed for repair, you can try disconnecting the battery for 10 seconds to see if the check light will stay out, and you can check your 2 ECM fuses in the under dash fuse box.
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Old 08-31-2003, 10:12 AM
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You can check for codes without a scanner. You need to find the data link under the dash. It is normally mounted under the steering wheel area, not hard to find. Then install a jumper wire from the "a" and "b" slots (located top row, last 2 to the right) This will put the ECM into diagnostic mode and will cause the service engine soon light to flash a code 12 (one flash pause then two flashes) 3 times, them start flashing any codes that are stored in the ECM. After collecting the codes, post them back on here and we can let you know what the codes mean.

All this information is in the Emissions section of the Haynes Repair Manual. If you disconnect the ECM, you will lose any codes stored in the ECM. If something is wrong, they will come back when the ECM tests again.
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Old 08-31-2003, 04:04 PM
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CHECKED CONNECTORS A AND B. GOT A 45 CODE. ENGINE HARD TO CRANK. DID GET IT STARTED BUT RAN VERY ROUGH. MAKEING NOISE AS THO IT WANTS TO DIE OUT NEED HELP. THANKS
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Old 08-31-2003, 04:11 PM
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O2 sensor is bad...
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Old 08-31-2003, 04:17 PM
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not that here ain't the best......

but i see where CSK's are loaning use of autoxray scanners, I know oreilys will check for codes, and i imagine some others are doing it for free.....
sometimes you'll get a code for one thing, but it's something else malfunctioning that causes the original code to trip...........
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Old 08-31-2003, 08:31 PM
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I just changed the O2 sensor in my Suburban, which is most likely the same O2 sensor as your 4.3. It was $19 for a replacement from Autozone. From what I have read, the O2 sensor should be checked every 30,000 and replaced if needed.
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