1998 Ford Explorer engine noise

Just bought a 98' Explorer and had some questions regarding some noise I hear under the hood. The truck starts fine, idles fine everything
works great. When I go to drive off after a minute or so from a fresh start, the engine makes a clicking or rattling sound in rhythm with the revolutions of the engine heard only when I accellerate. The noise seems to eminate from the passenger side under the hood.
I've done some DIY internet research and some things point to "piston slap," but it doesn't seem to sound like that is described. The noise remains until the engine is fully warmed up and then I don't hear it unless I sit idle for a minute or so, but it goes away fast. Some friends of mine said it might possibly be too thin of oil for the weather (It's currently Winter), a valve is sticky, or a rocker is loose. I have no idea about these things at all.
The truck runs very good and very strong, so whatever it is isn't causing any sort of performance issues.
The engine is a 302c.i. 5.0 V8 with 62,5k miles.
I appreciate the help.
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Mine does the same thing -- I have a 1995 XLT, and have owned it from the beginning. I've ALWAYS changed the oil every 3000 miles and done everything that's needed. It runs perfectly. A mechanic told me that they do this, and mine has been doing this at least 5 or 6 years with NO problems [I have 122,000 miles on it]. I'm not a mechanic, and don't know much about cars, but I wouldn't worry about it.

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snipped-for-privacy@gmail.com wrote:

That's a reliable engine with low miles. Best bet is to take it to an experienced mechanic with a good ear. Some possibilities besides piston slap: * rod bearing knock * piston pin loose * hydraulic lifter sticky * valve adjustment out of range * low oil pressure causing lifter noise
The valve lash related problems make clicking noises, the connecting rod noises are louder tapping noises. You can try holding a piece of hose to your ear- move the other end around while listening to find the loudest area. You should be able to tell if it's coming from a rocker cover (valve lash related) or the crankcase (rod related).
Since it goes away when your rpms come up I'm thinking low oil pressure. You might change the oil and filter, and examine the bottom of the drain pan for metal particles. If you see gold colored particles, you have a bearing going. -Paul
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When I first purchased (new) my 2000 Limited, I heard a similar noise when engine was cold. The noise would disappear after 5-10 minutes. I didn't worry too much about it-the car ran perfectly.
After about 6K miles, I mentioned it to the dealer. He verified the noise, contacted Ford, then replaced the engine (5.0 V8). I never knew what the problem was; it was warranty work of course.
A friend had a similar problem with his Eddie Bauer. Ford also replaced his engine.
Just bought a 98' Explorer and had some questions regarding some noise I hear under the hood. The truck starts fine, idles fine everything works great. When I go to drive off after a minute or so from a fresh start, the engine makes a clicking or rattling sound in rhythm with the revolutions of the engine heard only when I accellerate. The noise seems to eminate from the passenger side under the hood.
I've done some DIY internet research and some things point to "piston slap," but it doesn't seem to sound like that is described. The noise remains until the engine is fully warmed up and then I don't hear it unless I sit idle for a minute or so, but it goes away fast. Some friends of mine said it might possibly be too thin of oil for the weather (It's currently Winter), a valve is sticky, or a rocker is loose. I have no idea about these things at all.
The truck runs very good and very strong, so whatever it is isn't causing any sort of performance issues.
The engine is a 302c.i. 5.0 V8 with 62,5k miles.
I appreciate the help.
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Leaking exhaust manifold and/or egr tube leaking

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