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.

LinkBack Thread Tools Search this Thread
Old 08-03-2015
Thread Starter
Join Date: Oct 2012
Location: Myrtle Beach, SC
Posts: 87
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.
Reply With Quote
Old 08-03-2015
RF Veteran
iTrader: (1)
Join Date: Jan 2014
Location: Vancouver, BC
Posts: 7,595
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
Reply With Quote
Old 08-04-2015
Thread Starter
Join Date: Oct 2012
Location: Myrtle Beach, SC
Posts: 87
I put one of those mechanic scopes up to different parts but didn't really hear anything
Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
Intermittent knocking feeling/sound on front-left C_Red90 Suspension Tech 3 07-27-2014 03:00 PM
slight hollow knocking sound in great detail description pbilt SOHC - 2.3L & 2.5L Lima Engines 1 04-25-2011 02:26 PM
Slight knocking. PlasticHero Drivetrain Tech 4 10-01-2008 08:17 AM
knocking sound when i accelerate clintusaf 4.0L OHV & SOHC V6 Tech 4 04-15-2008 05:37 PM
Spark Knocking???? fletch12518 4.0L OHV & SOHC V6 Tech 8 01-29-2006 11:41 PM

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -6. The time now is 08:50 PM.

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.