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Originally Posted by northern piper
I think you are going to need to elaborate on "spark knock" and explain what problem you are actually having.
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ok, here goes, when i start my van no problem, after i drive for 10 to 20 min i hear the valves knocking when i accelrate and when i cruise lets say at 45 miles an hour. when i slow down to turn and speed up i hear them. they do tend to get loud. but when the van is at idle no problem. i have been using the same gas since i have the van, mobil 87 octane. what do i do next.