Engine knock?

Hey guys looking for an opinion. I started my truck this morning and immediately made a knocking noise I have never heard. I restarted it and it continued for a min or so and then died off quickly to a light tick and then a few min later it went away completely. Now it purrs like a kitten. Checked and I have proper oil level although it looks kinda black. I am thinking stuck lifter? I have a supercharger and no catch can. Wondering if this is a result of 80k miles without one. Sorry for lack of info, on my phone.

 

It won't be a stuck lifter, since these engines use a solid bucket style lifters, not hydraulic lifters that can collapse / stick.

 

At first I thought it was a connecting rod or something, but that would not go away. I'm not familiar enough with the insides of these engines.

 

Also this was a cold start this morning. Ambient temp about 38F.

 

I get that too but not as severe. Start up once in a while, lil knocking noise for 10 seconds and goes away. Was thinking lifters myself

 

This is the first time it has done it. And the fact it went away makes me think something was stuck somewhere.

 

Its done it a cpl times to me. Changed oil and no difference. Temp outside below 40 degrees. I saw in manual at the 60,000 mile service to check tightness on lifters but if lifters were loose it would do it all the time right?

 

I also thought that the starter stuck at first, it was around the same time I changed my dead battery.

 

I am not s/c but did put on an oil catch can 800 miles ago. Through 2 oil samples found gas in my oil. Dint know if catch can will help this or not but I'll give it a try.

 

Hmmmmm. I will check about the adjustment on the lifters.

 

Like said above lifters are a shim and bucket type. If you had lifter noise it should be a consistent ticking noise. Not something that would disappear. Adjustment would be made by measuring and replacing shims to correct thickness.

 

My '15 V6 had a bad rod bearing at 10k miles, sounded fine at startup, once it got warm and oil thinned up it made a nasty noise. Ended up with a new short block.
I'd lean more toward valve train for a startup noise, but go get yourself a mechanics stethoscope and see if you can tell where it's coming from before thinking about taking anything apart.

 

piston slap

 

This doesnt sound like any piston slap i have ever heard.

 

Sounds like a timing chain tensioner.

 

yeah......me neither

 

Guess i will see tomorrow morning. I let it sit for 3 -1/2 hours today in 40deg weather and it was fine at startup. Hopefully tomorrow if it repeats itself i have something to go on.

Ill take a video this time.

 

Let me guess, you have the 4.0 V6?

 

That is correct.

 

Cold start up today.....everything was fine.