Archived Whump,whump, Help!

[cluckmaster]

Well, got my transmission in Sun, and yesterday hopped in the truck to grab some lunch and noticed a WHUMP, WHUMP, WHUMP sound coming from the passenger side of the engine bay. Popped hood, and it sounded like it was coming from the Scotty intake. I put my hand on the housing and you could feel the vibration matching the sound. It sounded similiar to when my #6 exhaust valve was out of adjustment when I first put the engine back together this summer. No white smoke. No loss of boost really. Temps in normal range. I pulled the valve covers and double checked the valve lash. Fired it up and watched the rockers and lifters work. Nothing seemed amiss. I don't think it's a pushrod.



-Could a burnt valve be the culprit? Do i check that w/ a diesel compression gauge, and where can I get one?

-Could it be a weak or cracked valve spring? I had them tested prior to putting the engine back together but that was 6 mo ago. Could the 3GSK and cam together hurt the stocker springs? And would it hurt for nme to run the truck w/ a bad spring until I can get another set?

-Could an injector gone bad cause a sound like that?



Thanks! -Josh

 

[AKAMAC]

Could be a bad intake valve. You could pull the air horn off and check for blow-back thru the intake at idle only. Watch for debris that can enter manifold.

 

[cluckmaster]

Forgot to mention that I cracked all injectors, one at a time, and each cylinder missed when that injector line was cracked. The noise continued throughout the procedure. This would indicate to me that it would not be a faulty injector, and also that there isn't a breech in the headgasket between cylinders. I could be wrong.



Thanks.