I have a 03 hummer h2 with 102,000 miles on it. Been having multiple issues with it from multiple misfires, 02 sensor running lean, 02 sensor running rich, press the pedal down n truck won’t go sluggish with high rpm’s until I press the pedal down a few times then it blows itself out n goes normal till I slow the truck down n it starts all over again, rough idle like it wants to stall but don’t, also the ac blows cold when driving but when at a idle blows hot air…. Please help
I’ve changed the 4-02 sensors, starter, alternator, battery, pass side exhaust manifold, muffler, fuel pump, fuel filter, 4 complete tune ups in 6 months with plugs wires/coil packs, new bcm, new radiator, Every mechanic is telling me something different and I can’t keep replacing parts
Sorry codes P0137, P0135, P0155, P0300 and usually 2 others for 02 sensors sometimes running lean and sometimes running rich but not on same side
What are the current codes?
yaser I add the codes if you have an idea
Did you use OEM oxygen sensors?
For the random misfire, look into FAQ on this forum.
Yes I use the ac delco
I’m just thinking out loud. I don’t know the solution to your problem. Assuming the oxygen sensors are good.
The way I would go about it is to trace the path of the oxygen sensors, and see which systems are in between each one. Find out which sensors are giving the bad readings. And it could be the system close to that sensor that needs attention.
If a ton of them have bad readings, I would look at the tail end of oxygen sensors.
Other systems to consider would be a dirty/bad EGR. Or even a dirty/bad catalytic converter.
obd-codes.com
It still sounds like a bunch of bad 02 sensors. I would check them for specified resistance and function.
Where did you get these supposedly OEM sensors from?
Advance auto