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Old 08-18-2011
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Rattling at 2.5 RPMS

Every time I hit the gas, when my engine reaches 2.5 RPMS, there's this rattling noise. I can't exactly describe it but it only does it at 2.5-3.0 RPMS. Any idea what this could be or lead me in a direction to start???
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Old 08-18-2011
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Sounds like it could be engine pinging. My 4.0 sohc does the same thing, sounds like marbles in a can. Throw some better gas in it and see if it goes away, then trouble shoot from there. New spark plugs, wires, coil pack, and cleaning up carbon buildup with some additives (seafoam). You could also try cleaning your maf sensor (there is a how-to on this). It also could be something simple like the catalytic converter heat shield vibrating at a certain rpm.
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Old 08-18-2011
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OP we need more info on your truck. Give us a year and engine size otherwise we can't help. I was gonna say the timing chains but I don't know a year engine size or anything.
So as of now I'm gonna say it's your muffler bearings.
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Old 08-18-2011
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x2 on the muffler bearings. Mine went within 50k miles. lol Also, do 4 bangers have a timing chain???
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Old 08-18-2011
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I didn't even see that I was in the 4banger section. I dunno if it's a chain or a belt.
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Old 08-18-2011
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Me neither...I just figured it was a belt. From google I found this post http://www.therangerstation.com/foru...t=60395&page=2

I guess the duratec has a chain and the lima has a belt??? someone correct me please if I'm wrong.
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Old 08-18-2011
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Quote:
Originally Posted by morris View Post
OP we need more info on your truck. Give us a year and engine size otherwise we can't help. I was gonna say the timing chains but I don't know a year engine size or anything.
So as of now I'm gonna say it's your muffler bearings.
Should i change my Muffler cable at the same time? :)
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Old 08-18-2011
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It's a 2002 Ford Ranger Edge 4x4. 4.0. automatic. and the noise is in the front, sort of to the right it sounds.
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Old 08-18-2011
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Ok, then you might wanna post in the 4.0L section. So With this added info I would say it's your timing chains that might be starting to go (loosen or stretch).

Search on here, but most Guys will say that swapping a motor is easier and cheaper in the long run.
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