Hi gang, new(ish) member here wanting to say hello and ask for some help. I appreciate any help you all could offer.
My wife's 2006 Envoy 4.2 started acting up a few weeks ago. It's got several things going on that have shown up together:
P2431(secondary air valve sensor out of range)
Intermittent rough idle when the car is hot.
Intermittent stall at stop light
Intermittent bucking or missing while accelerating
I've done a lot of reading here and TV forum and have tried a LOT of solutions. Here's what I've tried so far:
New Plugs and Coils, AC Delco OEM
Throttle body removal and thorough cleaning
MAP sensor cleaning
PCM reset
Tested injectors resistance with multimeter
Tested fuel pressure
Replaced secondary air valve/sensor/gasket, tested relay and fuses
Tested Secondary Air pump, relay, and fuses
The DTC p2431 comes and goes every 3 or 4 times running the engine. The "freezeframe" for the code shows the engine is off (0rpm) when the code is triggered? Maybe that's normal?
Right now I'm questioning the ignition switch. I've replaced it twice several years ago for different symptoms which were resolved.
And possible bad wiring to the SAI valve. PCM issue?
Deleting it isn't an option with emission inspections here.
Any ideas? 😁
Thank you!
My wife's 2006 Envoy 4.2 started acting up a few weeks ago. It's got several things going on that have shown up together:
P2431(secondary air valve sensor out of range)
Intermittent rough idle when the car is hot.
Intermittent stall at stop light
Intermittent bucking or missing while accelerating
I've done a lot of reading here and TV forum and have tried a LOT of solutions. Here's what I've tried so far:
New Plugs and Coils, AC Delco OEM
Throttle body removal and thorough cleaning
MAP sensor cleaning
PCM reset
Tested injectors resistance with multimeter
Tested fuel pressure
Replaced secondary air valve/sensor/gasket, tested relay and fuses
Tested Secondary Air pump, relay, and fuses
The DTC p2431 comes and goes every 3 or 4 times running the engine. The "freezeframe" for the code shows the engine is off (0rpm) when the code is triggered? Maybe that's normal?
Right now I'm questioning the ignition switch. I've replaced it twice several years ago for different symptoms which were resolved.
And possible bad wiring to the SAI valve. PCM issue?
Deleting it isn't an option with emission inspections here.
Any ideas? 😁
Thank you!