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Bosch spark plugs: WR7DC vs W7DC
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02-13-2010, 10:17 AM
Mike D
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Join Date: Jan 2006
Location: Tucson, AZ
Posts: 5,358
Yup, the "R" is for resistor. I don't think you'll fry anything but you are not getting a "hot" spark. Could definitely be causing the lag under load.
Try the NGK's, BP6ES's or whatever number they've changed to for a better spark.
Mike D
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