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2003 Chevrolet Impala Question: my check engine light blinks when i go over 30 mph..runs kinda rough and stalls

 

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longben, Davenport, IA, August 09, 2012, 04:36
 Rookie

took it to auto zone and they said it was the #3 cylinder misfiring..so i changed fuel injector and still blinks over 30 mph

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  • Answer #1

    Greg's Orange Auto (13428 Answers) , Orange, CA - (714) 361-9386
    globalhelper August 09, 2012, 06:16
     Master

    did you repl plug and coil also. what lead u to repl inj 1st. they are almost always good over plug and coil

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    longben, August 15, 2012, 04:47
     Rookie

    they said that the injector might be bad so i replaced it and the plug and coil..but it still confuses me because even if i put the car in neutral and coast down the hill..right at 30mph the check engine light starts blinking

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  • Answer #2

    Chevy Power August 09, 2012, 08:07
     Journeyman

    A misfire is almost always caused by not enough fuel or spark. You will need to determine which is the cause.

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    longben, August 15, 2012, 04:49
     Rookie

    the spark plug was changed...the old one had black oil on it looked like

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    ziptie12, August 16, 2012, 07:16
     Master

    re-check the new spark plug after a few hundred miles and see if you are still getting deposits on it.Make sure you got OEM type plug! Reply with what you find.

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    longben, August 17, 2012, 22:33
     Rookie

    still does it....plug is still oily lookin

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  • Answer #3

    csubak30 August 09, 2012, 08:42
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     Master

    Most likely coil or spark plugs.

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  • Medium-star Best Answer
    ziptie12 August 09, 2012, 20:33
     Master

    The 'blinking' check engine light is a sign that your engine is running poorly enough that it IS doing damage to your converter (and most likely other systems as well).If you're doing the 'repairs' yourself , spend money on a correct diagnosis before buying more parts. Codes tell you what system is being affected many times , not that a specific part is bad (although many do).DO NOT HAVE IT DIAGNOSED BY A PARTS PLACE. They sell parts. A repair shop diagnoses and repairs cars.

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