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Flashing engine light


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02-06-02, 11:52 AM   #1  
Flashing engine light

1999 Oldmobile cutless supreme, has a coutiuous flashig check engine light. Have pulled dow 2 codes; code P306 for a #6 cylider misfire (replaced all plugs and wires and the coil pack. Now have code P300 for random misfires. Any ideas on this???

 
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02-06-02, 02:02 PM   #2  
Joe_F
What do those codes come out to be?

Don't have a reference handy. Check my signature file.

 
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02-06-02, 08:15 PM   #3  
knuckles
P0306 = Misfire on #6 cylinder

P0300= Random misfire

Is the engine actually misfiring to the point that you can feel it as you drive?

 
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02-07-02, 12:09 PM   #4  
1999 Oldmobile Cutlass supreme, V6, 3.1L, automatic, "M" series with air. Has continuous flashing check engine light. Can feel a definate hesitation during acceleration. Gets smoother as the speed increases, but it still "jerks". Have been able to download 2 codes; 1) P306 - #6 misfire. Replaced all plugs and plug wires. No help. Also replaced the #3 & #6 coil pack. Still no help.
Disconnected battery to clear codes. Light continues to flash. Got a new code; 2) P300 - Random/multiple misfires detected. Checked PVC vavle - it's good, listened for vacuum leaks using a stethoscope ad soapy water. No leaks. Tried to clear the computer and it will not let me erase the code. Any ideas?

 
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02-07-02, 01:13 PM   #5  
mooser1
maybe Joe can help further with the symptoms, sounds like an injector or two starting to clog.......try a tankfull of premium octane fuel......you will have to use an OBDII scan tool to "erase" the trouble codes and make your warning lights quit flashing......the old "disconnect the battery" method no longer works on 96 and later vehicles......

 
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02-07-02, 03:53 PM   #6  
Joe_F
How's the spark plug on that cylinder? The wire?

Any oil leaking that might be causing the misfire? (Happens)

 
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02-07-02, 05:01 PM   #7  
danc37166
re: FLASHING CHECK ENGINE LIGHT

WHEN THE LIGHT FLASHES, IT'S LETTING YOU KNOW THE PROBLEM MAY DAMAGE YOUR CATALYST. BE CAREFUL HOW MUCH YOU RUN IT UNDER THESE CONDITIONS. IF THE IGNITION IS OK YOU MAY HAVE INJECTOR PROBLEMS. IT SHOULD HAVE IGNITION VOLTAGE ON ONE WIRE AND THE PCM SUPPLIES THE GROUND. HOPE THIS HELPS.
DANNY

 
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