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Old 02-04-2012, 17:58   #1 (permalink)
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Arrow VALVE TRAIN RATTLE?!

Hey guys! Back again with my money pit

I can hear a really bad rattle around 3k rpms, but only under load. Also, if I accelerate PAINFULLY slow, the rattle never happens. Sitting in my garage I can rev as high as I want with out any issues. It sounds like the valve train, but I'm not sure.

I tried adjusting timing for kicks, but the rattle never changed.

Any ideas?? Thanks a ton.

-Jeremy
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Old 02-04-2012, 21:38   #2 (permalink)
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Re: VALVE TRAIN RATTLE?!

Sounds like your timing is advanced too much. When engine is hot, does it seem like the battery almost dead when you try to start it?

What year/make of your Ford and engine size?
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Old 02-05-2012, 00:52   #3 (permalink)
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Re: VALVE TRAIN RATTLE?!

Could be detonation. Perhaps timing too advanced or fuel not high enough octane rating for the engines compression ratio.
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Old 04-12-2012, 21:22   #4 (permalink)
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Re: VALVE TRAIN RATTLE?!

Sounds like detonation problems, check your ignition timing. Your slow acceleration may hold a much steadier vacuum pressure for vac advance if you run it, hence minimalising det probs.
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