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Hummer H3For the Hummer driver who wants the rugged look and off road capabilities of the Hummer, but in a smaller size and with a more fuel economy friendly engine.
if you remove the front oxygen sensor and Put a pressure gauge in its place the pressure reading should be way less then 2 psi even under acceleration idealy you do not want to see any pressures there so ideal would be 0 psi. anything close or over 2psi means there is a restriction. could be cloged cats could be cloged muffler.
you can try cleaning the MAF with MAF sensor cleaner first before replacing.
Last edited by bronxteck; Apr 16, 2025 at 09:50 AM.
if you remove the front oxygen sensor and but a pressuregauge in its place the pressure reading should be way less then 2 psi even under acceleration idealy you do not want to see any pressures there so ideal would be 0 psi. anything close or over 2psi means there is a restriction. could be cloged cats could be cloged muffler.
you can try cleaning the MAF with MAF sensor cleaner first before replacing.
X2 on cleaning the MAF. I also suggest checking your Air Filter Cannister is properly seated and reasonably clean within the Air Filter Box.
I switched coil 5 and 4 around again (boredom) and still a misfire on cylinder 5 and also got code p0106.. was looking to replace the map sensor but there isn’t a ac delco one?? Any suggestions?
Ran seafoam through it and still stumbles when I shift it into gear. The check engine light flashes and it shakes. Any other ideas??
You could go with the basics...
New air filter after good cleaning your throat on your intake pipe and butterfly.
Check your exhaust has good flow thru.
Do a oil and filter change and see if anything looks foul.
Try another fuel treatment with some hot shot injector cleaner.
Anything a good brain storm can discover to find solutions... Good luck and give it a hard run on the interstate.
New air filter after good cleaning your throat on your intake pipe and butterfly.
Check your exhaust has good flow thru.
Do a oil and filter change and see if anything looks foul.
Try another fuel treatment with some hot shot injector cleaner.
Anything a good brain storm can discover to find solutions... Good luck and give it a hard run on the interstate.
all this has been done actually. It has brand new injectors and the rest I already did
