Fuel trim is set by the ECM during running operations and is not adjustable unless you have the computer and program to reset the parameters for the ECM
maybe if you ran the fault codes first and replace any faulty sensor found then the ECM could get on with the job of adjusting the fuel trim
SOURCE: 2005 GMC Envoy SLE blower fan speed #5 is not working
More than likely this should just be your resistor. You have different sized coils on the back of your resistor for all the different fan speeds. if one of them burns out or breaks then that certain speed will not work.
SOURCE: Fuse Box Location 2006 GMC Envoy
Under the rear seat, drivers side.
Black box you will need to remove the cover.
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SOURCE: 2006 GMC Envoy and the A/C fan wont work in number 5 position
replace the resistor 4 the blower motor that should slove that hope this helps
SOURCE: gas gauge on 2006 gmc envoy says empty after fill up
this is a giant comon problem right now with gm vechiles it is in the fuel sending unit the unit needs to be replaced ( about 400$) and the gas tank needs to be dropped out to get to it for many more people with the same proble go to topix.com there is about 96 of us with the same problem
SOURCE: The blower speed switch only works on 5. The
this problem is caused by a defective blower speed control resistor, it is located near the blower motor, very cheap to replace, part is around $35
Testimonial: "Thanks I thought it might be that. Good info!"
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