I have completed the hutch mod as suggested in a previous thread about my truck but the truck still makes a knocking noise.

the noise was not there when i bought it. i am sure of it.


i poked around with a stethoscope and the noise is definitely loudest touching the passenger exhaust manifold. second loudest on passenger valve cover. everywhere else just sounds like normal engine noises.

it knocks like that at idle. and light loads. if i am coasting, i dont hear a thing. if i am under a good load, say over half throttle, with boost anyways, i dont hear a thing.

at part throttle cruising speed it sounds like gurgling or air escaping a water jug??? really dont know how to describe it.

its not loud, if i have the radio on at all, i cant hear it, but im **** about my truck.

rpms also seem to wander at idle, no idea if related.

i think it started about two months ago.
1 month ago, i put injectors in it and it did not change the sound whatsoever.
did the hutch mod yesterday and it did not change the sound one iota (which is why i felt comfortable posting the video from before i did it)
truck does not use oil at all.
truck really has no blow by to speak of.
does not seem to miss.
not short on power.

this noise is not NEAR loud enough to be a rod in my opinion.

am i dealing with a injection pressure issue?
wrist pin?
bad lifter?

am i being a complete tool? and there is nothing wrong?

 

I have chased intermittent knock on Stinky for two years, and I talked to many experts about this issue. The general consensus is: Sometimes these things knock, and it does no harm. I've heard of many owners just rolling with it and the engine just keeps going for many miles.

I'm not saying get over it... I'm saying you may end up in that camp.

Causes of knock that I've experienced:

• Aerated fuel
• Aerated oil.
• Loose injectors.
• Bad cushion ring on an injector.
• Tired oil.
• Mixing oil types (changing oil brand, but residual oil still in the rails).
• Hot outside temps or long hauls (the root cause of this one is still a mystery to me).
• Faulty reman injectors.

There's ****, then one notch above that (or below... depending on your point of view), you'll find me.

 

I think that you are wise to be concerned-but know that not all the noises you hear are easily solvable.

 

sorry guys, this just really bugs me.

 

That's the very one I'm wrestling with right now. Theoretical sources:

• Air introduced into the LPOP from a leak in the pickup tube (inside the oil pan)
• Maybe a bad seal on the vacuum side of the LPOP housing
• LPO system not really keeping up with HPOP (oil filter restriction, weak LPOP, pressure regulator failure, etc...)
• Valve guide leaks blowing a lot of air/exhaust into the oil up top

I'm about to make one more stab at the fuel system this weekend, parts are on the way. Stinky has a jaded past, and I have some different theories on what has resulted from his temper tantrums.

I forgot to mention fuel additive (with lube and cetane boost) has helped many members - everybody has their favorite product.

Whatever my issue is, it's been there for many tens of thousands of miles and it's not getting worse - but there are good days and bad days.

 

the valve guide theory seems to be somewhat of a stretch to me. they would have to be leaking a good amount to introduce aeration, wouldnt they? and the oil is not in suction or pressure there. just gravity return.

also. if they were leaking, you would get carbon build up under the valve covers? wouldnt you get pressure in the crankcase if it was that bad as well. something that would look similar to excessive blow by seen through the oil fill hole or dipstick tube?

 

Exhaust leak from passengers side manifold? Do you see any soot? Particularly around #7?

Mark

 

It's a stretch, but I saw #2 making foam and sending the foam down the hole. I don't think I got it on vid... maybe next time. I do, however, have this:


You can't see this under normal circumstances, but I have a warm-up tune with the EBPV closed. This puts 15 PSI backpressure on the exhaust system at idle, and I can see the leaks.

 

Mark made a good suggestion, check it out. Then I would go back under the valve cover on that side and check the torq. It really sounds like one bad injector to me. I had number eight do that to me and you could here it mostly at idle till it got really bad. Changed it out along with the FRX and its gone.

 

The truck has no signs of an exhaust leak. It has no soot on or near the manifolds, up pipes, turbo etc. not even a little bit.

Believe me, i have tried to find an exhaust leak because thats kinda what i wanted it to be. i can learn to ignore an exhaust leak.

I may bust the valve covers off once again in the next couple of days if i get the motivation.

In the meantime. what i have noticed is bubbles on the dipstick after it has been running. ill post some pictures.

Disclaimer: i had a really hard time getting my phone to focus on something that close and i do not have a proper digital camera. so there were "opportunities" for better pictures with even more air but my phone would not focus without some fuss.




before i started the truck. sat over night.







Here, I started the truck and immediately walked to the front and pulled the dipstick. (5-10 seconds of running) those dots are not dirt or bearing material but in fact a ton of tiny air bubbles. debris does not pop and disappear like this.





These last three were after 2 or 3 minutes of idle. no revving. no driving.





More bubbles.





Had the stick out for a while at this point fighting with camera focus and watched a lot of the pop, run to the surface before this one took.

I dont know if that is a "normal" amount of bubbles. or if i am dealing with true aeration. but i have never seen any of my gas engines do that.

 

Couple things I would do if for no other reason than the Detective inside me.

1. Is the correct oil being used? There are oil additives that will reduce / eliminate foaming. Although, that's not bad.

2. An oil analysis would provide some information as to the general condition and what it contains. That would be the best evidence since we can't see exactly what going on inside the engines lubrication system.

3. A wrist pin knock (actually slap) is not the end of the world and certainly not too advanced in your case if the audio is good.

4. A fuel stabilizer / treatment may assist with air in the fuel if in fact it is cackle.

 

Never seen that in my oil. Do an oil analysis at black stone and see what happening. Its cheap enough. It has to be pressurizing some where, blocked CCV may be. That or your using the wrong oil.

 

The oil im using is Rotella-T SAE 15w40. has been the whole time ive owned it anyways.

can the CCV even get blocked on these engines?

how do i go about an oil analysis? does it show anything about foaming anyways as it all bubbles out. or would it show a reason for the foaming?

 

Google Black Stone and they will send you free sample jars and you send them in. It's about 30 dollars. And yes the CCV can get blocked. Is yours stock? If not it is usually the hose out to the back that get plugged.

 

my CCV is stock. i have not done that mod thing.