Need help with spark knock miss on lt1
12-12-2011, 06:14 PM
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Need help with spark knock miss on lt1 As described in my ICM thread, I replaced a ICM that tested bad and still have the miss, we tested a EGR that was not holding vacum and still have this miss. When cold the car runs fine, but as soon as it warms up it have this bad miss. When driving around the car is fine, but if you give it more than 1/4 throttle it has this bad spark knock. I checked the fuel pressure, I checked the wires, and there is no check engine light. What else, besides the OPTI. It was replaced and just started last week with this problem. Thanks in Advance
