Ok guys, i assure you that before posting this, i have done lots of research and im hitting dead ends. Here goes;
New to me 07 avalanche with a misfire on cylinder 6 (please keep reading before saying AFM issues, maybe it is, but Im not there yet). So the misfire only happens once a day if i drive consistently or after being parked for over 2 hours. Typical scenario- back up from my driveway with no issues, drive for about 2 miles, and flashing check engine light with light engine shake, it blinks for about 2 or 3 minutes then back to normal, sometimes the check engine stays on, sometimes it turns off, i do get the stabilitrack warning light as well. After that, no issues, and never a lifter tick even when its misfireing, engine has about 20k miles acording to previous owner, truck has 195k miles.
This is what I have done so far:
1. Moved coil from cyl 6 to cyl 3
2. Move injector from cyl 6 to cyl 2
3. Replaced all spark plugs and wires (only because they were Autolite and figured AC Delco would be better)
4. Checked for vacum leaks with carb cleaner and nothing found.
5. Ordered a Range to keep it in 8 cyl mode. I will receive that today, so I have not installed it yet. I will update when i test it.
Misfire cyl 6 still coming up, no other codes.
Like I said, no lifter tick and the problem goes away after just driving.
What would you check next? Any sensors? Wiring maybe? Drive it off a cliff? You tell me.
Thanks in advance!
New to me 07 avalanche with a misfire on cylinder 6 (please keep reading before saying AFM issues, maybe it is, but Im not there yet). So the misfire only happens once a day if i drive consistently or after being parked for over 2 hours. Typical scenario- back up from my driveway with no issues, drive for about 2 miles, and flashing check engine light with light engine shake, it blinks for about 2 or 3 minutes then back to normal, sometimes the check engine stays on, sometimes it turns off, i do get the stabilitrack warning light as well. After that, no issues, and never a lifter tick even when its misfireing, engine has about 20k miles acording to previous owner, truck has 195k miles.
This is what I have done so far:
1. Moved coil from cyl 6 to cyl 3
2. Move injector from cyl 6 to cyl 2
3. Replaced all spark plugs and wires (only because they were Autolite and figured AC Delco would be better)
4. Checked for vacum leaks with carb cleaner and nothing found.
5. Ordered a Range to keep it in 8 cyl mode. I will receive that today, so I have not installed it yet. I will update when i test it.
Misfire cyl 6 still coming up, no other codes.
Like I said, no lifter tick and the problem goes away after just driving.
What would you check next? Any sensors? Wiring maybe? Drive it off a cliff? You tell me.
Thanks in advance!