1984 Ford F 150 with 4.9 liter 6 pings under load going up hill. If you press the throttle all the way to the floor, the Pinging goes away. It is timed at 10 dg. BTC and appears to be advancing properly. This year has the TFI Distributor module on the Dist. It also has the flow or feedback 1 barrel Carb. New wires, correct new plugs etc.
Does this year have a knock sensor? Could it be running too lean or too rich at some point? Possible carbon buildup on some of the pistons?
Odd but really annoying problem. Any help appreciated.
Wednesday, August 10th, 2011 AT 9:08 PM