(Signal Wave Graph )Info" 02 Grand Prix 3.8 N/A - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 02-06-2014, 09:17 PM   #1
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Cool (Signal Wave Graph )Info" 02 Grand Prix 3.8 N/A

Trying to Diagnose Driveability issue Poor gas Mileage and no spark on coil #6

Related Codes are *** Follows

#P0100 MAF Circuit Malf
#P0100 MAF Circuit Out of range
#P0102 MAF Circuit Sig low
#P0103 MAF Circuit Sig High
#P0104 MAF Circuit Intermittent

#P0105 Map-BARO Pressure Circuit Problem
#P0106 Map-BARO Pressure Circuit Out Of Range
#P0107 Map-BARO Pressure Sig Low
#P0108 Map-BARO Pressure Sig High
#P0109 Map-BARO Pressure Circuit Intermittent



On a Cold Start up Black Smoke / Rich Condition is present

(Coil #6 Has No Spark)


What Should My Signal wave Look like and or Read ? to determine a bad ECM and of a bad Ground and or Pigtail harness Maf/Map Sensors some good help would be great
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Old 02-06-2014, 09:38 PM   #2
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im not sure about the other stuff but if you know the coil itself has no output change it with the one of the other ones and see if it follows if not its the icm if it does its the coil. its good on these engines to fix one thing then clear the codes and see if it fixes other issues or you have more than one
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Old 02-07-2014, 10:11 AM   #3
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Like Justin said, move the coil pack to see if the "so spark" condition moves to a different cylinder. If that makes no difference, change the plug and wire. Most of what you are seeing are symptoms of the misfire, not causes.
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