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Help with weird engine noise *vid inside*

   
Old 01-27-2011, 06:18 PM
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Question Help with weird engine noise *vid inside*
the other day my friend was driving his car everything was fine then he starts the car and hears this noise we dont know if its the bottom end or a push rod or sumthing any thoughts will help us out alot thanks...


http://www.youtube.com/watch?v=e4Px7zlbonI
Last edited by GARAGE_BUILT_Z28; 01-27-2011 at 07:19 PM.
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Old 01-27-2011, 08:02 PM
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Valvetrain would be my guess, bent pushrod, collapsed lifter, rocker needle bearings, etc. Pull a valve cover or two.
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Old 01-27-2011, 08:06 PM
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hard to tell from the vid, Could be something in the valve train, as stated above pull the covers and check everything, It could also be a rod letting go, Either way I would not drive that car like that, whatever it is sounds real bad.. also where is your air filter assy?
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Old 01-27-2011, 09:26 PM
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Originally Posted by S10xGN
Valvetrain would be my guess, bent pushrod, collapsed lifter, rocker needle bearings, etc. Pull a valve cover or two.
ok we'll check that out thanks...
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Old 01-27-2011, 09:34 PM
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Originally Posted by RARON455
hard to tell from the vid, Could be something in the valve train, as stated above pull the covers and check everything, It could also be a rod letting go, Either way I would not drive that car like that, whatever it is sounds real bad.. also where is your air filter assy?
what would we be looking for when we pull the covers?..he hasnt drove it since it happened...its sounds extremely bad and where hoping its not the bottom end...it didnt have the assy when he bought it so he has to get all the pieces...
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Old 01-27-2011, 09:37 PM
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Sounds like a bent push rod, but thats more common for a m6 car, can see by the video its a a4. If its not a pushrod, then its something in the valve-train, like said above, pull the covers and start fishing around, you'll find something.
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Old 01-27-2011, 09:48 PM
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Sounds like a bad lifter.
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Old 01-27-2011, 09:48 PM
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sounds like the push rod hitting the valve cover, ive seen it before. maybe the rocker slipped off or broke a stud for some stupid reason.
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Old 01-27-2011, 10:09 PM
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Sounds more like a pushrod hitting the valvecover. Kind of fast to say lifter.
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Old 01-27-2011, 10:19 PM
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That's exactly what my Honda sounded like with a bent rod. Just my 2 pennies.
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Old 01-27-2011, 10:24 PM
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maybe its mad at you for calling it a bitch...... when you take off the valve covers it should be pretty easy to tell if its a rocker, one of them will look obviously different from the others
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Old 01-27-2011, 10:47 PM
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Originally Posted by nightrunner06
sounds like the push rod hitting the valve cover, ive seen it before. maybe the rocker slipped off or broke a stud for some stupid reason.

does this come from high miles or just a failed part that can happen to any LS1?
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Old 01-27-2011, 10:51 PM
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Originally Posted by twelver12
when you take off the valve covers it should be pretty easy to tell if its a rocker, one of them will look obviously different from the others
ok will do thanks bro


Originally Posted by twelver12
maybe its mad at you for calling it a bitch......
haha she's a bitch when she's bad and his baby when she's good l0l
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Old 01-28-2011, 02:35 AM
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IMO sounds like a spun rod bearing.
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Old 01-28-2011, 09:19 AM
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Originally Posted by David_viny
IMO sounds like a spun rod bearing.
thats the worse case and where hoping it isnt but we'll kno by sunday
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Old 01-29-2011, 02:19 AM
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that sounds exactly like what my buddies didwhen he had a rocker arm loosen up after a cam swap. i would lean top end for sure. lifter, pushrod, or rocker
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Old 01-30-2011, 10:07 PM
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Ever figure it out?
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Old 01-30-2011, 10:39 PM
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Originally Posted by rich5368
Ever figure it out?


He had some guy come take a look and the guy said its the rod bearings so he's just gonna get another LS1 short block...
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