tapping - late 2004 model - Ford Powerstroke Diesel Forum
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Old 08-18-2013, 06:22 PM
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tapping - late 2004 model

My Excursion has a tap in the engine that is sometimes very loud and at other times is barely noticeable. This has been going on for almost a year now without getting worse or better. The engine has 170k miles and has had head gaskets/studs, oil cooler, FICM and all drivers side injectors changed within the last 50k miles. The truck is stock, no tuner or upgrades. It runs great. Occasionally, I can feel a little shudder or miss at idle at a red light but only after idling for a minute or more. I've tried using a mechanics stethoscope to locate the sound but I can't find anything distinct. The loudest tap I can hear with the scope is touching the front of the heads - both sides about the same. I've checked the nuts on the flex plate, they are tight and in good shape. I've also changed viscosity of engine oil and tried several oil additives, but these didn't make any difference at all. The sound is similar to a lifter going out but I would think that the engine would miss if that were the case. I'm convinced that if this were a rod bearing, it would have had failure by now.

Anyone ran into this problem before? Any help or suggestions are appreciated. Thanks.
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Old 08-22-2013, 09:52 AM
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Last week at oil change, I added 2 quarts of Lucas Oil Stabilizer. The tapping is still there and is still sometimes louder than other times, but this definately helped quiet it down. The tapping is less noticable. I use Rotella 15w40 oil and Motorcraft filter. I think either an injector is causing it or the HPOP. But those are just guesses.
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Old 08-22-2013, 10:02 AM
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I have heard of other people with a sound like that and not being able to locate it and it ended up being a tentioner
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