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12-21-2013, 02:12 PM
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  Join Date: Dec 2013 Location: Huntersville, NC
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(Thread Starter) |   Not Ranked : 0 score  MSP 03 with missfire at high RPM or Boost I am a proud owner of a Mazdaspeed protégé 2003.5. I have owed this car since new. I have a little problem. I have a misfire only at high RPM (over 3,500) or under boost. I have changed the spark plugs and wires, but still have the same misfire. Do I need to check for a code??? is there any other possibilities that I am not looking at. The car runs good under idle and when normally driven. When you ask boost to it then it starts having the problem. Thanks, Gus |
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12-22-2013, 09:06 AM
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| Join Date: Dec 2013 Location: Huntersville, NC
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(Thread Starter) | Not Ranked : 0 score Ok, finally found the problem. NGK Iridium 11 Spark Plugs gap at 0.045. As soon I gap them at 0.030-31 the problem was solved. Ran it for 15-20 min at the interstate. No misfire at all. Good vacuum at -22. Good boost at 8.5. will inform is the problem happens again. |
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