ShawnQ
Member
2017 110k mile Denali w/6.2
Wife was driving home from a 3hr road trip and when she pulled in for gas, she noted a checked engine light (flashing), a TC light, and a hesitation/miss. She wasn't far from home, so she brought it to the house. I scanned it with a basic code reader and found P0206 (injector circuit) and a P0300 (misfire). The engine didn't make any unusual lifter noises, just stumbling because it was running on 7 cylinders.
So I've done some reading, and done some troubleshooting...in the wrong order! hah.
I pulled the intake, and Ohm tested the injectors - they all read the same on the auto-ranging meter I have, but it's hard to tell exactly what the reading is because the cheap meter doesn't say the range. I'm going to buy a selectable range meter and try them. Regardless, they're all reading the same. Otherwise, I haven't done much else. I was going to pull the rail and inspect injector #6 regardless, but the rail is stuck and I don't have the right pry bar(s) to lift it. I will get back to work on it later this weekend or early next week. I went into this assuming I had a bad #6 injector.
All of the searching and reading I did AFTER tearing it apart makes me worried that it's a DOD/AFM lifter issue and not just an injector. Especially since they ohm out the same on all 8.
In the meantime - should I pull the passenger valve cover and turn the engine over, and watch the rocker on cylinder 6?
I could/should probably do a compression check also before I go much further. Wish I would've done a little bit of reading before I tore the intake off! I may have left it all together and dropped it off somewhere if I had known it was possibly a lifter.
Any further advice/guidance is appreciated.
Wife was driving home from a 3hr road trip and when she pulled in for gas, she noted a checked engine light (flashing), a TC light, and a hesitation/miss. She wasn't far from home, so she brought it to the house. I scanned it with a basic code reader and found P0206 (injector circuit) and a P0300 (misfire). The engine didn't make any unusual lifter noises, just stumbling because it was running on 7 cylinders.
So I've done some reading, and done some troubleshooting...in the wrong order! hah.
I pulled the intake, and Ohm tested the injectors - they all read the same on the auto-ranging meter I have, but it's hard to tell exactly what the reading is because the cheap meter doesn't say the range. I'm going to buy a selectable range meter and try them. Regardless, they're all reading the same. Otherwise, I haven't done much else. I was going to pull the rail and inspect injector #6 regardless, but the rail is stuck and I don't have the right pry bar(s) to lift it. I will get back to work on it later this weekend or early next week. I went into this assuming I had a bad #6 injector.
All of the searching and reading I did AFTER tearing it apart makes me worried that it's a DOD/AFM lifter issue and not just an injector. Especially since they ohm out the same on all 8.
In the meantime - should I pull the passenger valve cover and turn the engine over, and watch the rocker on cylinder 6?
I could/should probably do a compression check also before I go much further. Wish I would've done a little bit of reading before I tore the intake off! I may have left it all together and dropped it off somewhere if I had known it was possibly a lifter.
Any further advice/guidance is appreciated.
