Well I got the knocking sound and then a #6 misfire. Opened up the valve cover to find that my #4 exhaust lifter looks like it came apart inside. Gonna have to pull the head to see how bad things are. Anyone else seen this? These are as good as I could get with the scope I have.
The cam lobe looks much better than this roller. Gonna take a chance and run it. Replacing my injectors while I am this far. They look pretty bad. Do I need to replace the high pressure fuel pump, or any other lines seals in the fuel line? I am replacing the 2 lines that feed from the HPFP to the rails, but not sure if the pump is a replace if removed item. I have my computer back from LS1, so I am hoping my family car will be running in the next few days.
It won't be long before you have a noise from the cam being damaged. Those camshafts in the LT based engines are very soft. Unfortunately when you look at the cam lobe from The lifter side it will play tricks on your eyes. It will look like it's in better shape than it is. I'd rather see you do a full delete and skip out on having the heads machined then to just replace the bad lifter and hope that it holds up for a little while. See my last comment I just left before this one. Due to my delayed response I'm replying to both your comments now.
I haven't in personally experienced it yet but I did see it at the dealership once and have heard of it several times. My guess is this is a newer direct injection engine. It doesn't happen that often but when it does it typically bends the pushrod as well as damaging the lifter. I often tell people if they have a bent to pushrod to make sure that they check the top of the lifter to make sure it's still intact. It can be caused from a couple different things, one could be the pushrod interfering (newer 2014+) and I sell a replacement for that on my website. The other option is that the VLOM is leaking and partially activating the lifter causing it to fail thus causing the pushrod to hammer against it unevenly which eventually damages it. When that happens it's best to install the VLOM plug and a disable AFM in the tune
Got it apart. Everything else looks ok, but the #4 exhaust lifter definitely blew up. It broke at the bottom of the spring cup where it connects to the top of the lifter. Roller and cam love have scuffs on them where I imagine there was some bouncing. Kinda tight on money, do you think a new lifter will be alright on the old cam lobe? It looks like the roller in the picture.
Definitely time for a full delete unfortunately. If you need me to put together a budget friendly delete kit for you I probably could. I have most the parts on hand just need a few more. It would give you time to save up while I put it together. Sorry for the delayed response I had a busy week last week.
The cam lobe looks much better than this roller. Gonna take a chance and run it. Replacing my injectors while I am this far. They look pretty bad. Do I need to replace the high pressure fuel pump, or any other lines seals in the fuel line? I am replacing the 2 lines that feed from the HPFP to the rails, but not sure if the pump is a replace if removed item. I have my computer back from LS1, so I am hoping my family car will be running in the next few days.
I haven't in personally experienced it yet but I did see it at the dealership once and have heard of it several times. My guess is this is a newer direct injection engine. It doesn't happen that often but when it does it typically bends the pushrod as well as damaging the lifter. I often tell people if they have a bent to pushrod to make sure that they check the top of the lifter to make sure it's still intact. It can be caused from a couple different things, one could be the pushrod interfering (newer 2014+) and I sell a replacement for that on my website. The other option is that the VLOM is leaking and partially activating the lifter causing it to fail thus causing the pushrod to hammer against it unevenly which eventually damages it. When that happens it's best to install the VLOM plug and a disable AFM in the tune