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I bought a 96 mustang..a lemon of course.. now when I start it, it makes a knocking sound. The sound starts to quite down after a few seconds, comes back loud and then quiets down again. Keeps on doing it. The car seems to run fine, except for making this crazy noise. Was told that needs a new engine, but then couple of other people told me it might be a Flywheel. Not mechanically inclined at all..any suggestions? please,,
 

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Valve train noises occur at half of crankshaft speed so even if your ear can't tell whether the noise is happening at 700 rpm (raps per minute) or only 350 rpm, your eyes can. Hook the timing light to any one cylinder and watch the flash illuminate the timing mark. Stare at it for a while and see if the flash jives with the knock. If it does, then it is more likely to be rocker arms, pushrods, lifters, camshaft, cam bearings, timing chain and gears. If the noise seems twice as fast it is probably in the crank, mains, rods, rod bearings, wristpins and pistons.
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