This topic contains 3 replies, has 2 voices, and was last updated by 
-
Posts
-
My 2015 Silverado lost compression in the number 4 cylinder. After doing some research, it appears to me that the AFM lifter has collapsed. It still doesn’t make any sense that the cylinder would lose compression. It doesn’t hold the valve open. Can anyone explain to me why this happens? Thanks, Scott
-
After pulling the valve cover, we noticed a bent push rod. We replaced it and still no compression and no rocker arm movement. I guess the next step is to pull the head.
-
We discovered that number 4 lifter on the AFM has collapsed. I have had the heads cleaned resurfaced and tested. No problems. I have ordered a AFM delete cam kit and a programmer. AFM is going away…
-
This is a common problem that GM should Recall along with the transmissions.
You must be logged in to reply to this topic.