High cam deviation

[CapeCoral944]

2000 C2 6 speed, 82K miles. I’ve had for almost 6 months 3k miles. CEL P01128 the other day. Only other previous codes were P01128, P01130, and P0327. I cleared these back in December to see if they would repeat.  When I was checking the FRA and RKAT, I also decided to check the cam deviations. Bank 1 showing over 12 and bank 2 over 4 at time of CEL. I cleared and rechecked, those values stay steady, coming down slightly (11 and 3) as the car heats up. Car drives fine. I changed the oil shortly after purchase, nothing in the filter. Can tensioner pads being worn allow that much deviation? I’ve read about the possibility of the tensioner being issue, is there a way to test? Anything else that could be causing this problem? 1st thing I did after purchase was IMSB replacement so that is good.

[JFP in PA]

40 minutes ago, CapeCoral944 said:

2000 C2 6 speed, 82K miles. I’ve had for almost 6 months 3k miles. CEL P01128 the other day. Only other previous codes were P01128, P01130, and P0327. I cleared these back in December to see if they would repeat.  When I was checking the FRA and RKAT, I also decided to check the cam deviations. Bank 1 showing over 12 and bank 2 over 4 at time of CEL. I cleared and rechecked, those values stay steady, coming down slightly (11 and 3) as the car heats up. Car drives fine. I changed the oil shortly after purchase, nothing in the filter. Can tensioner pads being worn allow that much deviation? I’ve read about the possibility of the tensioner being issue, is there a way to test? Anything else that could be causing this problem? 1st thing I did after purchase was IMSB replacement so that is good.

 

Unfortunately, this is a common sign of wear on the chain pads between the cams, which requires replacing the pads and retiming the cams:

 

[CapeCoral944]

Thank you, I’m sure your right about the pads. Do you think the hydraulic tensioner might be bad as well?

Edited February 8, 2021 by CapeCoral944

[JFP in PA]

4 minutes ago, CapeCoral944 said:

Thank you, I’m sure your right about the pads. Do you think the hydraulic tensioner might be bad as well?

 

It could, but failing hydraulic tensioners typically cause excessive start up noise, not deviation value problems.  As you would be removing the hydraulic tensioners to replace the pads, it would be a good time to update them, just be careful as the tensioners are not all the same and cannot be interchanged.