Where is this knock coming from? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat

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Old 04-18-2005, 12:29 PM   #1
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Default Where is this knock coming from?

Sometimes I'll be cruising along at 60mph, punch it, can get maybe .3 KR. Other times I'll punch it can get a moment of insane KR upwards of 12 points! When this happens I can hear the engine hesitate for a split second as if I tapped the gas once, then floored it a second time, when in reality I just floored it from the get-go.

This has gonna be KR or something is banging. I'm beginning to suspect that oversize waterpump pulley I have is hitting the really close motor mount so I'm gonna get a lightweight stock sized one for the time being, but any other ideas what could cause this? Yes recently I did put in the 3.2" to test her out, but I can't see how going from 3.3 to 3.2 would cause speratic KR spikes.
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Old 04-18-2005, 12:48 PM   #2
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Fuel delivery, maybe filter or FPR? I know you're obsessed with plugs so i assume those are golden...
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