popping through exhaust

8lugchug

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7.3 idi non turbo zf5 trans .Need some help ... having a loud popping sound through the exhaust. Anybody with same experience? Valves ?
Where to begin
 

DaveBen

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When do you hear the popping? At start up or after it is hot?
 

8lugchug

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Seems to be after it warms up it gets louder
Kinda just sounds like it’s running rough when you first start it
But popping def gets louder after driving a little
 

8lugchug

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Update .. I pulled the valve covers and checked the valves/rockers etc
Found one valve that had some play in it
Seems to me like the spring is either broke or wore out def not seating completely
Also found a lot of wear on the rockers(valve side )
Is there anyway to flush these engines
I had quiet a bit of build up in it
 

IDIBRONCO

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You can flush these engines out, but I can't remember what others have used right now. What kind of build up? If it's sludge, then that's "normal". If it looks like charcoal, then that's a sign of bad valve guides.
 

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