I am going to look at an 08 Z71 (with 140k on it) and want to make sure I have the right things to look for in trying to determine if the AFM has caused any non-catastrophic issues and this is my plan:
1) Check the plugs on #1 & #7 against #3 and #8. All 4 should be the same if all things are fine. If plugs 1 & 7 are fouled (since 1,4,6,7 are the shut down cyls, right), there is an issue.
2) If the plugs were possibly changed, there could still be cyl wall or ring damage. So pressure testing cyls 1,4,6,7 against 2,3,5,8 should be able to show any issues as well. (pressure on a flex fuel should be lower as it's the alum engine as opposed to the iron / non-flex model, right?)
If these all pass and the engine is fine for now, I will turn off AFM and life should be good.
If I choose to leave AFM on, I should change the value cover and add the baffle and do a good cleaning of the cyl with the cleanser fluid.
Does this sound like a solid enough plan to give me a pretty reasonable idea of the condition of the engine?
I of course will not be able to test drive it long enough to monitor the oil use, so I am hoping that these checks will provide some good information.
I will continue my research and post followup info here as well.
Thanks.
1) Check the plugs on #1 & #7 against #3 and #8. All 4 should be the same if all things are fine. If plugs 1 & 7 are fouled (since 1,4,6,7 are the shut down cyls, right), there is an issue.
2) If the plugs were possibly changed, there could still be cyl wall or ring damage. So pressure testing cyls 1,4,6,7 against 2,3,5,8 should be able to show any issues as well. (pressure on a flex fuel should be lower as it's the alum engine as opposed to the iron / non-flex model, right?)
If these all pass and the engine is fine for now, I will turn off AFM and life should be good.
If I choose to leave AFM on, I should change the value cover and add the baffle and do a good cleaning of the cyl with the cleanser fluid.
Does this sound like a solid enough plan to give me a pretty reasonable idea of the condition of the engine?
I of course will not be able to test drive it long enough to monitor the oil use, so I am hoping that these checks will provide some good information.
I will continue my research and post followup info here as well.
Thanks.