shane67gtx
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I did, lol that’s why I’m on here trying to figure this out. Everything looked completely fine. No shavings, rocker arms are tight and shimmed accordingly. Basically everything from lifters and up have been replaced. I’m at a loss
383 ENGINE TAP!!!
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Why not mention that...Then more than likely you have an exhaust leak.
Sixpactogo
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Sounds like the noise my 383 was making. Turned out to be a weak spring on the fuel pump. If you have a stethoscope, it is easy to check.
shane67gtx
Member
It’s definitely not an exhaust leak. If you’re able, watch the video I posted on this thread. It’s a pretty violent tap. I just feel if it was a lifter or something it would do it nonstop, but it sorta comes and goes and quite down after it runs for a little.
shane67gtx
Member
I mean if that’s the case then that would be great! Really wasn’t wanting to tear the top end down again and replace the cam
Lefty71
Well-Known Member
Did narrowing it down with the dowel rod do any good??
Fuel pump rod maybe but the rod going sounds deeper from what I am hearing.. I have heard exhaust leaks sound the same as your video. It quiets down a little cause the metal expands sealing the leak a little..
Like the guys said exhaust leaks can fool you, before you rule it out stethoscope around the exhaust flanges thoroughly...it's quick and easy.
Pull all the belts off and start it to rule out an accessory issue.
If you suspect valvetrain, fire it up and let it idle with the valve covers off, you can really zero in on any valve gear issues that way.
If you suspect the fuel pump, run the engine a minute, shut it down, then unbolt the pump and remove the rod, and start it back up. There'll be enough gas in the carb to idle without the fuel pump for long enough to verify/rule it out.
To me, over the internet, it sounds like an exhaust leak or possibly a loose bolt (crank pulley/converter etc). Oh make sure all the spark plugs are tight. Happy hunting!
Pull all the belts off and start it to rule out an accessory issue.
If you suspect valvetrain, fire it up and let it idle with the valve covers off, you can really zero in on any valve gear issues that way.
If you suspect the fuel pump, run the engine a minute, shut it down, then unbolt the pump and remove the rod, and start it back up. There'll be enough gas in the carb to idle without the fuel pump for long enough to verify/rule it out.
To me, over the internet, it sounds like an exhaust leak or possibly a loose bolt (crank pulley/converter etc). Oh make sure all the spark plugs are tight. Happy hunting!
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With the valve cover off, unplug the ignition coil cable. With a remote starter button, slowly crank engine and observe valvetrain movement. Check pushrods while doing do.
Beep!Beep!
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I had one that would stop and start, was a dirty sump screen, how's oil pressure?
shane67gtx
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Does have good oil pressure, 50 psi when cold, around 25 psi at 180 degrees in traffic
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maybe some of that snake oil that claims to free up sticky lifters
Have you narrowed it down to a particular cylinder?
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I've seen lifter noise come and go in several vehicles over the years...... but no, I wouldn't tolerate it either
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just went back and watched..... I didnt see it before......that comes and goes?..... sounds like every revolution to me, almost like a converter bolt....... pull the valve cover
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Torque converter bolt....
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you'll be lucky if it's a broken rocker.....looks like it's missing to me
Hope it's not something fell in that cylinder.
Carb screw, miscellaneous bolt/ nut etc
Bouncing around
Carb screw, miscellaneous bolt/ nut etc
Bouncing around
padam
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Spend a few bucks on a mechanics stethoscope.
Works way better than a screwdriver thru the ear.
Works way better than a screwdriver thru the ear.
shane67gtx
Member
Everyone thanks for the help!! Especially the few who said check the fuel pump lol. Bought a stethoscope and listened around for a few and determined it was 100% coming from the fuel pump. Will be replacing it tomorrow and will let y’all know how it goes
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