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Q: what could be wrong when starting truck you hear a ticking sound?
on 2002 Mercury Mountaineer

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
when starting my truck i hear a ticking sound not like a rod thrown sound? thought i needed a tune up cause truck was hesitating when stop at stop light like it wants to shut off
(1) Answer
sounds like you have a spark coil or a boot that's going bad, grounding out some how, make sure all the wires are connected to top of coils and give them a slight tung not to hard just a little as the conectios can break