eheal6520
Member
Hi Guys
My 2012 S10 with 135k miles on it suddenly would not start. I tried all the suggestions here (fuses, WOT, etc.). Checked the diag codes and only get a 14. Finally took it to the dealer for a look see and they confirmed that I have good spark (put in a new set of plugs) and the injectors are working fine (I had pulled, cleaned and tested them). What they did find is a compression problem, "left cylinder has 115 psi and right cylinder has 65 psi should be 96 psi". I would have left it with them but $3200 in labor just to find the problem is a bit stiff. I have not recreated the compression test so I am trying not to suspect the dramatic, bad rings, cracked piston, etc. I decided to check if one of the valves was stuck open causing the low compression. What I found is the exhaust cam shaft way out of alignment to the tune of 4 links on the cam chain. Unfortunately in the case, my general attitude of "if it ain't broke, don't fix it" appears to have gotten me in to trouble.
What I would like to know is, is the book correct or is there some sort of undocumented update. To my untrained eye it looks like it skipped 4 links. I have read about the cam chain tensioner and since mine is OEM I have ordered a new one. See the pictures below. Any advice would be helpful. Thanks
intake cam gear (fyi the chain is loose on the left because I had removed the tensioner before this picture)
intake cam alignment hole
exhaust cam gear - not like the manual
K alignment gear
Page 5-22 from the manual with the alignment
My 2012 S10 with 135k miles on it suddenly would not start. I tried all the suggestions here (fuses, WOT, etc.). Checked the diag codes and only get a 14. Finally took it to the dealer for a look see and they confirmed that I have good spark (put in a new set of plugs) and the injectors are working fine (I had pulled, cleaned and tested them). What they did find is a compression problem, "left cylinder has 115 psi and right cylinder has 65 psi should be 96 psi". I would have left it with them but $3200 in labor just to find the problem is a bit stiff. I have not recreated the compression test so I am trying not to suspect the dramatic, bad rings, cracked piston, etc. I decided to check if one of the valves was stuck open causing the low compression. What I found is the exhaust cam shaft way out of alignment to the tune of 4 links on the cam chain. Unfortunately in the case, my general attitude of "if it ain't broke, don't fix it" appears to have gotten me in to trouble.
What I would like to know is, is the book correct or is there some sort of undocumented update. To my untrained eye it looks like it skipped 4 links. I have read about the cam chain tensioner and since mine is OEM I have ordered a new one. See the pictures below. Any advice would be helpful. Thanks
intake cam gear (fyi the chain is loose on the left because I had removed the tensioner before this picture)
intake cam alignment hole
exhaust cam gear - not like the manual
K alignment gear
Page 5-22 from the manual with the alignment