- 0
2009 6.0L AFM delete
-
Recently Browsing 0 members
- No registered users viewing this page.
-
Forum Statistics
246k
Total Topics2.6m
Total Posts -
Member Statistics
-
Who's Online 28 Members, 1 Anonymous, 2,004 Guests (See full list)
By using this site, you agree to our Terms of Use.
Question
Tunnelgas
Good afternoon. First post to thread. Thanks in advance for any assistance and guidance.
A little background...my apologies in advance if I do not explain everything properly as I am not a mechanic...rather a tinkerer with what I would like to think is some common sense and understanding.
I have a 2009 Suburban 1500LTZ 4x4 with a 6.0L. It has 160,000 miles give or take and has been an excellent vehicle for our family. At around 150,000 miles it dropped a lifter. At that time, I pulled it down and replaced just the one lifter, put it back together and it ran fine for about 10,000 miles until it recently lost another lifter.
I spoke to an engine shop around town and they suggested that I should have gone ahead and replaced all of the lifters and the cam when I pulled it down the first time and that I should do that now. They also suggested I do away with the AFM. I did a little research and found that some had done this with good success. I reached back out to the engine shop and they indicated that they sold a kit for this. The kit included new replacement valley plates, new LS7 solid lifters, etc. I confirmed with them that a stock cam could be installed and I ordered that directly from Chevy. I also ordered a new oil pump.
I methodically went through everything, buttoned the engine back up and started the engine. It had a knock in it but it had not been tuned yet so I didn’t think much of it. I trailered the vehicle to that engine shop to have the AFM tuned out of the ECM. They commented there that they thought the knock was a piston issue. I had a hard time believing this since it was running perfectly prior to loosing the lifter, but the knock is bad! I have checked compression and it is good in all cylinders. I made up a test plate to check oil pressure coming out of the oil pan and put another gauge in line at the sending unit. I am getting a fairly steady oil pressure of 30lbs at the bottom (seems a little low) but it fluctuates between only 7-12lbs on the other gauge. I pulled the engine back down and checked the lifters and cam...they seem fine. I checked the bottom end when I pulled the oil pan and everything seems fine there as well.
For the life of me I cannot determine the cause or source of the knock. It does not get better when it is warmed up. I have driven it a little just to see if anything else presents itself as a problem. The engine is not missing at all, accelerates fine, etc.
Any ideas on where I should look or what I should do? In hind sight, I guess I should have just replaced the lifters and cam with stock parts but from what I was reading the AFM delete was pretty straight forward and when the engine shop told me they sold a kit I thought it would be a good time to simplify things. I am now wishing I hadn’t but remain hopeful that there is some experience that I lack that can help me get things back in line.
Thanks,
Steve
Link to comment
Share on other sites
6 answers to this question
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.