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Originally Posted by Duke2.6
Changing from the OE HD electrode to the standard electrode will NOT cause the idle issues you are reporting. Both should be gapped the same. The difference is that the HD version has a wider center and ground electrode. You have another problem!
Duke
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Hello Duke, are U sure about W9DC and W9DCO need to be gapped the same? They printed on the package that W9DC has 0.9 mm gap and W9DCO has 0.8 mm. Once I got all W9DC gapped at 0.9 mm , the car runs fine. However, I do notice a much higher gas consumption. Instead of 200 miles, I got only 120 miles per 1/2 tank of Exxon 91 gas.
Could a large gap cost me more gas?