Pre-1997 Models

94 f150 5.0 auto 2wd

 
  #1  
Old 04-14-2019, 12:14 AM
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94 f150 5.0 auto 2wd

New here and stumped. I purchased this truck with what sounded like a rod knock. Got it home and changed out the rod bearings, there was wear but nothing that I would have expected for rod knock and no metal in pan. Still had the noise after I finished. Checked oil level and it was good, added some Lucas to see if that would help. Noise starts within a couple seconds of start up, it goes up and down with rpm, doesn't change in gear or not. Pulled plug wires and noise doesn't change, when trying to listen to the noise it sounds like it is all over, can't pin point it. Pulled the trans back today to check the Flexplate and don't see any cracks, bolts were tight.

I know this was long winded, but any help or ideas would be great.

Thanks

https://drive.google.com/file/d/1TwymnAEFp4_GoQLW2l1Hu4JFoUzzy9GV/view?usp=drivesdk

https://drive.google.com/file/d/1wYf_Q1pSn1HLRu0EDCAIAoplZtzgW-C1/view?usp=drivesdk
 

Last edited by Fiction1990; 04-14-2019 at 12:19 AM.
  #2  
Old 04-14-2019, 08:59 AM
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the video links require permission
 
  #3  
Old 04-14-2019, 12:26 PM
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Link shared
 
  #4  
Old 04-14-2019, 12:42 PM
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Link shared
 
  #5  
Old 04-14-2019, 03:07 PM
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I'm wondering if the crankshaft itself is out of alignment/misbalanced.
 
  #6  
Old 04-14-2019, 03:27 PM
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Any idea how that would happen? I have the transmission pulled back right now, is there anything I should look at. I noticed the Flexplate says aod on it, is it possible the wrong Flexplate was installed at some point? I'm going to pull the torque converter and push the tranny back so I can start it and figure out if it is in the motor.
 
  #7  
Old 04-14-2019, 03:36 PM
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Sounds like valve train noise to me.
 
  #8  
Old 04-14-2019, 04:01 PM
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You mean as in loose or broken rockers?
 
  #9  
Old 04-14-2019, 08:18 PM
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Pulled the torque converter out, and started the truck. With the converter out the noise is so much quieter.
 
  #10  
Old 04-14-2019, 08:39 PM
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I would remove the valve covers and inpect the valve train. You may also have a cam with worn out lobes. Worn out cam lobes are very common on Chevys and not so much on Fords.
 
  #11  
Old 04-15-2019, 11:32 PM
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Ok pulled the valve covers and everything looks ok. However I did find the egr tube with a break in the flex pipe. I don't know if that would make the noise I've got, but I'm sure it would have made noise.
 
 


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