2013 Yukon 6.2 with p0304 code

[mountie]

I just replaced a broken valve spring on my 2013 Denali. Had it towed to a local shop that said they did diagnostics on it and gave me a quote for $5500 to replace the lifters. Told him I’d do it myself and had him tow it to my house. Spent 45 minutes removing the valve covers and found a broken valve spring. Got lucky that there was no damage to the valve or piston and got it back up and running.View attachment 440732

That is an 'ouch'....... I hope my '05 5.3 doesn't do that..... Or is it on your newer engines?

 

[wjburken]

That is an 'ouch'....... I hope my '05 5.3 doesn't do that..... Or is it on your newer engines?

That is in my 2013 Yukon 6.2. Had the same thing happen on my 2007 Yukon 6.2.

 

[Budzy24]

Update: So i pulled the vlom and tried the plug from cpr to block oil to the lifter. While i had the intake off, jumped the starter relay, and the valve would work first 5-6 strokes and then quit moving. I put in the plug and put it back together and still same thing, misfire in 4. I havent messed with it since, had a vacation last week.

I am now researching a delete, assuming i have a bad lifter. Trying to decide if i want to do a stage 1 while i have it tore apart or go back stock.