Quote:
Originally Posted by Bitter
if it were a knock sensor fault the PCM wouldnt just try to find the right timing, it would retard it to safe mode and the car would run rich and slow with a CEL. it sounds more like theres knock due to a problem and the pcm is trying to retard timing, it does so, but maybe cant pull enough timing away to stop the knock. knock isnt always caused by higher compression from carbon buildup, but also can be caused by the carbon buildup turning into a glowing spot of heat like a glowplug which lights off the fuel/air mix at the wrong time. if you get any predetonation you'll probably suffer some severe engine damage, thats what melts holes in pistons. knock is like a hammer beating everything, predetonation is like a torch.
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Well, don't know if it helps but sometimes when the car is cold, you'll step on the gas and it won't move for a second and then start going. Other times it will go in and out like it has gas and doesn't, also usually when the car is cold.
Mike
