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OBDII Multiple Misfire Codes
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steve01832
Veteran
Sep 30, 2006, 5:18 AM
Post #1 of 1
(3272 views)
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OBDII Multiple Misfire Codes
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Multiple misfire codes on GM has been a growing problem I've seen on OBDII cars. The first few were nightmares but lately I've taken a different approach. I set my trace scope to 14V over 1 second scale. I set the probes on the crank sensor. At idle I've seen a solid pattern, when I snapped the throttle I noticed the wave voltage drop instead of just tighten up. After replacing the sensor I repeated the test and it looked normal. A tight pattern holding 14v under snap throttle conditions. So if you get erratic misfire codes and you have a trace scope, you may want to check the crank sensor pattern for a tight pattern with no voltage loss as you increase the RPM.
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