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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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Old 12-26-2014, 11:06 AM
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Up to 196k miles now and still tapping. I've replaced the belt tensioner and the injectors were recently rebuilt - no change. The sound seems to be loudest on the drivers side rear of engine.

Runs like a new one. But makes a lot of noise doing so! I'm stumped.
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Old 12-26-2014, 01:45 PM
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You know there's lifter issue's with these 6.0?
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Old 12-26-2014, 02:07 PM
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Quote:
Originally Posted by donf610 View Post
You know there's lifter issue's with these 6.0?
Yes, I'm aware of that. Learning from what I've read, most of the lifter issues are roller related and I would think it would have gone out by now. It's been more than 2 years of this. No louder today than when it began. Sometimes quieter than others.

But it is possible, I guess.
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Old 12-28-2014, 05:49 PM
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I would switch to T6 5w40 first. That will make a significant difference in the normal sound of the engine. I know when I switched from Motorcraft 15w40 tp T6 I was amazed at the difference in sound. It will start much better in the winter also.
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Old 01-02-2015, 12:03 PM
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Originally Posted by Heathrm View Post
I would switch to T6 5w40 first. That will make a significant difference in the normal sound of the engine. I know when I switched from Motorcraft 15w40 tp T6 I was amazed at the difference in sound. It will start much better in the winter also.
Thanks, I will try the T6. I have Auto Enginuity PC Scan Tool, but I'm not too very familiar with how to use it. I was able to turn off each injector - one at a time but there was no change in the tapping sound on any cylinder. I thought maybe if it were a lifter or push rod, the sound would change when that cylinder fuel was cut off. But that didn't happen. Oil change coming up...
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Old 02-14-2015, 07:01 AM
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Over 2 years - no better, no worse

Synthetic oil change didn't help at all. I've looked closely for an exhaust leak, but didn't find any. Strange that the tapping will be loud at times and soft at other times. I'm starting to suspect the hpop might be making the noise since the sound seems to be coming from that general area. The IP pressures are normal according to the scan gauge and it runs good. I wish I could figure this out. It's a nuisance and I'm tired of listening to it.
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Old 02-14-2015, 07:20 AM
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You may want to pull the valve cover and have a look at your rockers.
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