Hey everyone, I've been battling this noise for quite some time now. Whenever my car idles in the morning when it's cold, it sounds almost like a diesel engine. It doesn't sound like it's coming from the actual motor itself though, it sounds more like it's coming from behind it, where the intake manifold/fuel injectors are. I know that Honda/Acura fuel injectors are ticky by nature, but could they get loud enough to actually make a knock noise? Also, whenever I accelerate the frequency gets progressively higher. I was thinking maybe an intake manifold gasket leak but my oil analysis comes back showing low silicon (no intake leaks). The fuel dilution in the reports is also always very low, and the oil comes back with a high flashpoint which tells me my injectors aren't leaking. Anyone have any ideas? The car's always been driven reasonably. The previous owner was an elderly lady who always babied it, and I never drive it hard either. I use fuel injector cleaner on every fillup, perhaps that could be causing some pinging? I've taken it to Acura about this noise problem and they said they couldn't hear what I hear, but it's clearly there.