Possible lifter knock
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Member
Joined: Dec 2015
Posts: 91
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From: Maryland
Probably the first thing you should do is check for a loose plug. Plugs in these engines tick just before blast off. It's too common to ignore. Lifters were used in push rod engines, none existent in this Modular SOHC engine. We know what you mean though....these use lash adjusters. Torque the plugs down to about 28' lbs or 1/2 - 3/4 turn after seat. Then post up what your using in the crank case and what's filtering it. 
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Joined: Sep 2013
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From: Behind You
Yeah, it could be a warped exhaust manifold. Remove the manifold and check it's flatness.You could also use soap & water to detect the leak in the exhaust manifold when the engine is cold.
You should not hear any valve train noise unless there is a vacuum & exhaust leak. SOUND NEEDS AIR TO TRAVEL
You should not hear any valve train noise unless there is a vacuum & exhaust leak. SOUND NEEDS AIR TO TRAVEL
Last edited by w0lvez; Sep 3, 2016 at 12:56 PM.
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Ummm....the valve cover resonates it from the air inside to the air outside.
You can use a broomstick handle or auto stethescope on the valve cover to see if you can better ID the source.
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Joined: Sep 2013
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From: Behind You
Thread Starter
Member
Joined: Dec 2015
Posts: 91
Likes: 4
From: Maryland
Ok guys it's definitely the exhaust manifold, passenger side. Good thing is the nuts don't look too awfully rusted. I think the sound that people thought was a lifter is actually something in the a/c system, as it only happens when a/c is on. I'll have to do some research on that. Thanks for all the help everyone. Hopefully I can find some time where I don't need the truck for a day or two to get this done.