ShawnQ
Member
Good evening, folks.
Trying to get a CEL fixed, and having issues diagnosing it. The DTC is P0174...I have searched and read a TON.
The truck is a 2017 Denali, 6.2, 125k miles.
It had the injectors and intake gaskets changed about 20k miles ago, as well as AC condenser...but not likely an issue.
It seems to run fine, but my LTFT on Bank 2 is in the +20s...
I do not have an injector fault code.
I do not notice any major intake/vac leaks with the brake cleaner test.
I do not see/notice any major exhaust leaks.
The O2 sensors seem to be even on both banks, with voltages fluctuating as I'd expect...so I don't think it's an O2.
Im leaning towards a bad injector or an intake leak. Any obvious ways to verify? I would just expect a code if an injector was dead, or horrible power, or economy. Seems to run pretty good and mileage is about normal.
I was thinking about pulling plugs first and going from there...maybe one is obviously cleaner than the other. With a LTFT reading +20, I expect a major issue...but I'm only seeing that one DTC.
Thanks in advance
Trying to get a CEL fixed, and having issues diagnosing it. The DTC is P0174...I have searched and read a TON.
The truck is a 2017 Denali, 6.2, 125k miles.
It had the injectors and intake gaskets changed about 20k miles ago, as well as AC condenser...but not likely an issue.
It seems to run fine, but my LTFT on Bank 2 is in the +20s...
I do not have an injector fault code.
I do not notice any major intake/vac leaks with the brake cleaner test.
I do not see/notice any major exhaust leaks.
The O2 sensors seem to be even on both banks, with voltages fluctuating as I'd expect...so I don't think it's an O2.
Im leaning towards a bad injector or an intake leak. Any obvious ways to verify? I would just expect a code if an injector was dead, or horrible power, or economy. Seems to run pretty good and mileage is about normal.
I was thinking about pulling plugs first and going from there...maybe one is obviously cleaner than the other. With a LTFT reading +20, I expect a major issue...but I'm only seeing that one DTC.
Thanks in advance
