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  #11  
Old 01-25-2010, 04:52 PM
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Originally Posted by theboomboom View Post
It goes away if I put the clutch in and let the engine wind down, but accelerating or decellerating it rattles. There is also a definite difference in the rattle driving normally vs WOT at the same rpm..
I'm no carb guy, but that sounds like a heat shield/exhaust component noise to me. I can make my 80 either do that or not do that while wheeling, just based on how much gas I'm giving it, and my theory is it's the twisting of the engine that's varying.


Can you make the sound happen while stopped? If so show your brother how to do it, then lie under the truck and look for the noise.. poking around with a 2x2 or something.
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Last edited by nakman; 01-25-2010 at 09:14 PM.
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  #12  
Old 01-25-2010, 05:13 PM
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Yeah, I had a 20R with a manifold heat shield issue just like that...
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Old 01-25-2010, 05:38 PM
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Yeah, I had a 20R with a manifold heat shield issue just like that...
Prior to going to a header this is the exhaust heatshield on my truck that vibrated occasionally. It was a pretty obvious rattle, particularly with the hood up. Sounded like if you sat a pie pan on the valve cover, a very distinct metallic buzz/vibe. It was tough for me to solve because I like to anti-seize everything. But being attached to the exhaust manifold bolts' tendency were to want to start rusting in place after cooking off the anti-seize. So I ended up using copper anti-seize (which is what I use on my spark plugs BTW because it's conductive) and snugging the bolts when they'd work loose.
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Last edited by DaveInDenver; 08-26-2010 at 09:14 AM.
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Old 01-25-2010, 07:28 PM
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All great suggestions - you should check the nut that holds on your air cleaner. I hear that if it is loose in can make the noise you are hearing...
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Old 01-25-2010, 07:51 PM
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All great suggestions - you should check the nut that holds on your air cleaner. I hear that if it is loose in can make the noise you are hearing...
Wow......quite a variety of opinons here...but all very interestingly good suggestions...these outta keep you busy for a few days Rick! Hopefuly its one of the simple ones thats the fix.
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Old 01-25-2010, 10:09 PM
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The old man beat me to it, but it took me about 30 seconds to diagnose once I popped the hood in the daylight. I appreciate all the wisdom being shared here, I'm sure I won't be the last one to go noise chasing and I hope this thread can be a good reference for those who have similar issues in the future to discover.
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  #17  
Old 01-26-2010, 07:40 AM
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All great suggestions - you should check the nut that holds on your air cleaner. I hear that if it is loose in can make the noise you are hearing...

Glad it was an easy fix.
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Last edited by MDH33; 01-26-2010 at 08:51 AM.
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  #18  
Old 01-26-2010, 08:42 AM
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Yabut... what was it??
Loose nut behind the wheel?
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  #19  
Old 01-26-2010, 08:42 AM
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Don't go be thinking I'm all that sharp, Rick figured out yesterday with your guys help. He brought me up to date when I got home last night and I could not resist putting my post up.
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  #20  
Old 01-26-2010, 08:44 AM
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Quote:
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Yabut... what was it??
Loose nut behind the wheel?
The nut that holds on the air cleaner cover was not snug and at higher RPM the washer would vibrate resulting in the noise.
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