1991 chev s-10 pick up

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  #1  
Old 11-17-06, 08:12 PM
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1991 chev s-10 pick up

Just installed a new battery and altanator.The check engine light comes on every once in a while.It dosen't do this all the time.
but when it does the light flashes on and off quickly.About half a second.When it flashes the engine bogs down quick as the light goes on and off.then its back to norm until the engine light flashes again.It does ok for a brief time,then low and behold it starts back up again.Any suggestions?
 
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Old 11-17-06, 08:39 PM
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Join Date: Dec 2001
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start by checking for codes you can do this with a jumper like a paper clip, at the aldl connector under the drivers dash jumper a and b and turn key on should flash each code 3 times then repeat them over until you remove the jumper.
should flash code 12 first then if any codes are stored it will flash them after code 12.
if it doesnt have any codes would suggest checking them again right after the problem has occured to see if any is stored then.
you might also locate the ecm onder the passenger side dash and tap on it lightly to see if you notice any change in the way the engine is running or if it causes the light to come on it would be a sign of a bad ecm if tapping on it causes a noticable difference in how it runs.
 
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