Lifter issue

[bobradley4]

 I was hoping someone could shed some light for me. I have a 2014 Silverado L83 engine. Came in ticking and skipping. All the basics were in tip top shape. So we removed the heads and found a non dod lifter on number 8 to have locked up and ate the cam up. Customer not wanting to put a performance cam in it so we replaced cam and all lifters back to OE. We also had the ecm shipped off and the afm deleted from it. We got it back together and started the engine. It has a skip on number 6 which is a dod cylinder. We removed valve cover and Started it. The valves worked fine until oil pressure builds up and then both rockers stopped moving. Contacted the guy who deleted the afm from ecm and he said it has to be the VLOM. So I purchased a new VLOM from the dealer. Started it back up and doing same thing. I know it isn’t the computer turning it off because I have the 5 pin connector that plugs into the VLOM disconnected. Would anybody know what’s causing this? 

[1SLOW1500]

I know. People. Like answers not comments but honestly.... If you know the truck is getting a dod/afm the "right" way to do that is a delete kit. Also customer states didn't want a performance cam and that's fine but a non dod cam is a must at the point your at.
Rule of thumb we swap out lifters to non dod int the kit install anyways. And and least check the push rods for damage or bend.
When you say skip. You mean miss fire? If so check codes then drive and record so you can see if it is in fuel or spark. You can remove spark plug on that cylinder and valve cover and check TDC against the valve.
If tune is hpt I would suggest you request the tune. You don't have to get the customer the file but just for. You knowledge and reference. Not that it is hard to push one button in tune. Dod/afm disable. But still.


Sent from my SM-N960U using Tapatalk

[bobradley4]

The ONLY way to do a delete on an L83 engine is a performance cam. You can’t just delete it and use the stock cam because the lobes on the stock cam dod cylinders on an L83 engine are ground differently than any engine before it’s date. Meaning the exhaust lobe is ground different than the intake lobe and if you just put regular lifters in it it will have 25psi compression difference from a non dod cylinder causing it to misfire at idle.  From what I’ve been told is that they don’t make a stock non dod cam for the L83 and that’s why you can’t just take one out of a non dod engine to use it. I could be wrong. This is just what all I’m told. I was also told that I could put it back all stock and get the afm option deleted and that would help a lot. So I did. It is now stock and having only the option of afm deleted but number six dod is staying dead. It’s not the VLOM because I have it disconnected. I even replaced it. For some reason though is that cylinder is shutting down MECHANICALLY only when oil pressure is built up. But it’s misfiring because the dod lifters on that particular cylinder are shutting down after oil pressure builds up. It’s getting fuel. It’s getting spark. My problem is the valves aren’t opening at all on that particular dod cylinder. It was not tuned. The ecm was sent to have just the afm deleted. Meaning no more 4cyl mode. That option has been taken out of the software. Oh and there isn’t a non dod cam for this engine “yet” unless you get a performance cam