LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Service Engine Soon Light

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Old May 30, 2014 | 10:52 AM
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Default Service Engine Soon Light

Just went to move the car out of the garage and got a blinking service engine soon light. I was just reading that it could be a misfire from a simple bad spark plug or bad wire. The car hasn't had any cat since 2011, and ran like a top like normal last night. I am noticing a small amount of white smoke from the exhaust at idea which has me very concerned. However I replaced the head gasket in 2011 also, and only drive the car maybe 4000 miles a year. No low coolant level light, no other warning lights. Thoughts? I don't have a scanner with me right this second or otherwise I would be scanning it.
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Old May 30, 2014 | 12:11 PM
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A simple paperclip will help you aquire the codes. I can't remember which terminals you have to jump though.
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Old May 30, 2014 | 12:29 PM
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Originally Posted by 93M6Formula
A simple paperclip will help you aquire the codes. I can't remember which terminals you have to jump though.
Can't do that unless he has a 93 (his sig says 94). That was the last year you could flash codes on an f-body.
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Old May 30, 2014 | 03:08 PM
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Originally Posted by shbox
Can't do that unless he has a 93 (his sig says 94). That was the last year you could flash codes on an f-body.
Oh shoot my bad, I thought you could do it on all OBD-I. Sorry OP.
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Old May 30, 2014 | 06:14 PM
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Flashing/Blinking SES light is indication of a cyl misfire. That could also make sense for the slight white exhaust as if you have a cyl misfire you likely are running rich on that bank.
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Old Jun 1, 2014 | 02:33 AM
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Originally Posted by kris72079
Flashing/Blinking SES light is indication of a cyl misfire. That could also make sense for the slight white exhaust as if you have a cyl misfire you likely are running rich on that bank.
... and that feature is only available on OBDII PCM's. OBDI does not have a crank sensor which is used to detect a misfire.

Originally Posted by Zacks94Z
Thoughts?
Yes. Scan it.
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