3.0 knocking sound?? - Ranger-Forums - The Ultimate Ford Ranger Resource


2.9L & 3.0L V6 Tech General discussion of 2.9L and 3.0L V6 Ford Ranger engines.

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Old 08-03-2015
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3.0 knocking sound??

I have a 2002 3.0 2wd and there is a weird knocking sound, almost like a busted bearing, coming from somewhere.

The noise only really starts after about 20 minutes of driving and is not all the time, only when the rpms are below 2000.

I crawled under it and it sounds like its coming from around where the cat, bellhousing, and oil pan are but can't be too sure.

Anyone have any ideas on what it could be?

Last edited by impact1223; 08-04-2015 at 05:34 AM.
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Old 08-03-2015
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I use a wooden stick like a broom handle to place at spots on the engine then put my ear to it, you can pin point noises better that way.

Now a couple of things to do
A rod bearing will knock when it's cylinder fires, so if you remove spark from each cylinder one at a time, and knock stops or is greatly reduced when that cylinder is not firing, if it does then you have a bad connecting rod bearing.
Unplug spark plug wires at the coil, it is easier, and unplug them and put them back on BEFORE starting the engine, then use rubber handled pliers to grip and remove during test

Crankshaft bearing will keep knocking.

The engine fan can make alot of noise when you are trying to pinpoint a sound.
With engine cold, loosen and remove fan belt from crank pulley
Now start engine, battery light will stay on, and you should only run it a few minutes without water pump turning
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Old 08-04-2015
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I put one of those mechanic scopes up to different parts but didn't really hear anything
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