2008 Acadia original owner.
3.6L V6 engine, LY7 engine, VVT on 4 cams, 275 HP
Lots of very mellow 2 mile commute/store drives. Not much (2-3 per year) short drives with throttle down and RPMs up.
82,000 miles. Conventional oil changed by oil life indicator or 1 year, so about every 6,000-8,000 miles. Oil usually checked between & before oil changes, rarely needed, I don't believe it has ever been a full quart down.
Had occasional CEL becoming more regular, then constante after about a year (accompanied by Traction Control/Stabilitrak message). But running great, MPGs same, so easy to ignore. Followed some random posts about Stabilitrak. Checked fuses. Went to clean Intake/Mass Air Flow Sensor, but found it clean enough to eat from. Did find poorly connected crankcase breather tube, I think that cured Stabilitrak message (mostly).
Got my own scanner. Code P0014 and often P0017 with it. If cleared, would come back, 0-3 days.
Checked all harness connections to cam sensors and solenoids.
Code P0014 = Camshaft Position “B” - Timing Over-Advanced or System Performance (Bank 1)
I changed that sensor and solenoid. The solenoid was covered with a dry brown color. I wouldn't describe as sludge or a film, looked like it had been in a meat smoker for an hour. I had seen signs of sludge in the engine. No changes in codes. I bought Crankshaft Sensor, but dot think I can get to it without a lift.
The previous oil change was about 1,000 miles prior.
I removed a quart of oil, and added a quart of Diesel, for a flush. Drove around the block and changed oil and filter. I used 5W-30 Synthetic, also added Seafoam with new oil.
About 1 month and 500 miles later. I think the P0014 has come on twice. I'm checking and clearing the codes almost daily. Stabilitrak message come on for one drive.
The Code P0017 comes on 95% of the time, 3-20 seconds after starting the engine, usually the RPMs will dip 100 RPMs and instantly recover at the exact same time. It doesn't seem to matter, cold engine, hot engine, 30˚ weather, 60˚ weather, long time sitting, short time sitting. Then if doesn't come on, or if I clear the code, it will not come on during the drive. Light to very hard acceleration, deceleration by downshifts, 50 miles on freeway, manually putting in a high gear and lugging it down on a hill. And it's running great through all of this, good power, no noises, and just purrs at idle.
My plan is to do 1-2 more 1000 mile oil changes (and wish hard). I have trouble believing a real timing issue wouldn't be triggered by some driving condition.
Any thoughts shared will be greatly appreciated.
3.6L V6 engine, LY7 engine, VVT on 4 cams, 275 HP
Lots of very mellow 2 mile commute/store drives. Not much (2-3 per year) short drives with throttle down and RPMs up.
82,000 miles. Conventional oil changed by oil life indicator or 1 year, so about every 6,000-8,000 miles. Oil usually checked between & before oil changes, rarely needed, I don't believe it has ever been a full quart down.
Had occasional CEL becoming more regular, then constante after about a year (accompanied by Traction Control/Stabilitrak message). But running great, MPGs same, so easy to ignore. Followed some random posts about Stabilitrak. Checked fuses. Went to clean Intake/Mass Air Flow Sensor, but found it clean enough to eat from. Did find poorly connected crankcase breather tube, I think that cured Stabilitrak message (mostly).
Got my own scanner. Code P0014 and often P0017 with it. If cleared, would come back, 0-3 days.
Checked all harness connections to cam sensors and solenoids.
Code P0014 = Camshaft Position “B” - Timing Over-Advanced or System Performance (Bank 1)
I changed that sensor and solenoid. The solenoid was covered with a dry brown color. I wouldn't describe as sludge or a film, looked like it had been in a meat smoker for an hour. I had seen signs of sludge in the engine. No changes in codes. I bought Crankshaft Sensor, but dot think I can get to it without a lift.
The previous oil change was about 1,000 miles prior.
I removed a quart of oil, and added a quart of Diesel, for a flush. Drove around the block and changed oil and filter. I used 5W-30 Synthetic, also added Seafoam with new oil.
About 1 month and 500 miles later. I think the P0014 has come on twice. I'm checking and clearing the codes almost daily. Stabilitrak message come on for one drive.
The Code P0017 comes on 95% of the time, 3-20 seconds after starting the engine, usually the RPMs will dip 100 RPMs and instantly recover at the exact same time. It doesn't seem to matter, cold engine, hot engine, 30˚ weather, 60˚ weather, long time sitting, short time sitting. Then if doesn't come on, or if I clear the code, it will not come on during the drive. Light to very hard acceleration, deceleration by downshifts, 50 miles on freeway, manually putting in a high gear and lugging it down on a hill. And it's running great through all of this, good power, no noises, and just purrs at idle.
My plan is to do 1-2 more 1000 mile oil changes (and wish hard). I have trouble believing a real timing issue wouldn't be triggered by some driving condition.
Any thoughts shared will be greatly appreciated.