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There are a few things that "tick" while an engine is running, one being the fuel injectors, but they shouldn't be loud enough to really hear any difference between idling and accelerating. The other being valve adjustment, or in the valve train itself. That could be one of several possibilities like timing, timing advancement or lack of, low oil pressure which operates the lifters for the valves, (if hydraulic), worn camshaft, worn tappets, (if O.H.C.), low oil level. Kinda hard to pinpoint it without actually hearing it in person, but i hope that may lead you in the right direction.

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Q: What does it mean when your engine makes a ticking noise when you accelerate but not when you idle?
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