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05 ford ranger knock

 
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87IrocTim
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Joined: 10 Jan 2006
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PostPosted: Wed Sep 14, 2011 6:29 pm    Post subject: 05 ford ranger knock Reply with quote

ok we need some help with an 05 ford ranger with the 3.0 v6. when you approach 1500 rpm and above a knocking noise comes into play, that is variable to engine speed. pretty much sounds like a rod knock.

but before any decisions are made, wondering if any of you guys have heard of this before and have any other less expensive options. it seems odd that it even has a rod knock considering its an 05 with 60,000 miles. thanks.

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10sec.et
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Joined: 29 Mar 2006
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Location: Houston,Texas
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1969 Oldsmobile Cutlass

PostPosted: Thu Sep 15, 2011 2:13 am    Post subject: Reply with quote

cut open the oil filter. if its a rod knock, you will find bearing material.
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clay
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Joined: 24 Nov 2002
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Location: South Carolina
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1972 Chevrolet Nova

PostPosted: Thu Sep 15, 2011 9:40 am    Post subject: Reply with quote

Put it in gear to get some load on it which should make it a little worse then pull wires one at a time. Should be able to hear a change and at least isolate it to a cylinder. Might have to give it a little throttle while in gear to put more load on it. If it's a rod, it should get louder and louder. Valvetrain doesn't really change sound with load, mains do somewhat but not to the extent a rod does. We did work on a mild 350 in a Malibu a year or two ago that the problem actually appeared to be a bad serpentine belt. Sounded just like a mild rod knock. Pulled wires - no change. Went up with rpm but never really could make it lounder with load increase. When we took the belt off and it went away we pulled all the pulleys looking for cracks, loose mounting, etc. and never found anything. Looked at the balancer elastomer - nothing. Torque conveter was tight, couldn't see any cracks in the flexplate. Put belt back on - knock came back. He sold the car before he changed the belt which sorta aggravated me but oh well - not my problem anymore. Clay
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87IrocTim
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PostPosted: Thu Sep 15, 2011 5:42 pm    Post subject: Reply with quote

ha thanks clay. well i will copy your answers and message them to my buddy. hopefully it can help him out. first new vehicle he ever bought and now has to listen to the music.
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adrianglock
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Joined: 17 Dec 2011
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PostPosted: Sat Dec 17, 2011 1:03 am    Post subject: Reply with quote

This sounds like a mechanical problem. It seems like there's something broken internally I used to have this problem when my truck bugged down. Whenever I change the oil there are metal slugs came from the engine. I had to rebuild mine coz there was too much noise and vibration as well. I replaced the broken bearings I mean all of it.
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[url=http://www.stylintrucks.com/vehicles/ford~ranger.aspx]Ford Ranger Parts[/url]
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jeep_406
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Joined: 12 Sep 2002
Posts: 1661
Location: Tewksbury, Mass 01876
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1972 Chevrolet Nova

PostPosted: Sun Dec 18, 2011 1:21 pm    Post subject: Reply with quote

Clay,
Just came across this post about checking for rod knock. Maybe I'm wrong but I used to pull plug wires one at a time looking for the noise to go away when the rod wasn't under load anymore when I took the spark away from the bad cylinder. Looks like I was checking it bass ackwards.

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