what should the plugs be gapped at
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1990 Infiniti Q45 Question: gapping the spark plugs
Answer #1patrick mannion from Greg Solow's Engine Room, April 24, 2009, 10:52Master
The spark plug gap should be ..039" to .043" of a inch. The Iridium or double Platinum plugs come pre set.
I like the Q45 but have seen random misfire caused by bad ignition coils, bad injectors, and or bad ECU (computer). I hope your car has no problems and you are just performing maintenance.