Hello - Hoping someone smarter than i can help me decode symptoms and data. '99 Suburban K2500 7.4
New to me rig - yesterday I replaced the spark plugs (just maintenance) and all 4 O2 sensors (had P0141 and P0161). After, upon restart, it was running incredibly rough and exhaust reeked of gas. there are no codes (other than steering speed sensor, which I already replaced, but that's another topic).
I have a Blue Driver and attached screenshots of logs I pulled - I don't know how to interpret these, but stuff that seems suspect to me are the fuel trims (high?) and timing (not sure what to expect, but it didn't change much from idle to ~2200 RPM). Also, the Mode 6 data (no clue what this is) shows two test failures, but cannot find anywhere to translate what sensors these are.
I also checked the coolant temp log and it looked fine.
After running and revving the engine a bit, the exhaust smelled different - almost like a mild burnt hair smell....
I don't know what to make of all this. Obviously the supposedly failed sensors would be the place to start if I could translate that. And that this occurred when I replaced the O2 sensors seems pertinent as well, but i don't know what to make of it.
Any ideas?
New to me rig - yesterday I replaced the spark plugs (just maintenance) and all 4 O2 sensors (had P0141 and P0161). After, upon restart, it was running incredibly rough and exhaust reeked of gas. there are no codes (other than steering speed sensor, which I already replaced, but that's another topic).
I have a Blue Driver and attached screenshots of logs I pulled - I don't know how to interpret these, but stuff that seems suspect to me are the fuel trims (high?) and timing (not sure what to expect, but it didn't change much from idle to ~2200 RPM). Also, the Mode 6 data (no clue what this is) shows two test failures, but cannot find anywhere to translate what sensors these are.
I also checked the coolant temp log and it looked fine.
After running and revving the engine a bit, the exhaust smelled different - almost like a mild burnt hair smell....
I don't know what to make of all this. Obviously the supposedly failed sensors would be the place to start if I could translate that. And that this occurred when I replaced the O2 sensors seems pertinent as well, but i don't know what to make of it.
Any ideas?