20 Most Recent 2003 GMC Envoy Xl - Page 4 Questions & Answers

You need to replace the blower motor resister to get the other speeds back.

Sounds like your throttle body. Try cleaning it out real good with carb. cleaner. You might need the throttle body.

heve utried adjusting the trottle , just put your foot on the accelerater and hold at just under 1000 revs if shaking goes then thats your problem should idle at just under 1000rpm

My wife drives a 2003 GMC Envoy and has been complaining about this same creaking noise upon breaking or going over speed humps. I researched this topic on the internet high and low and tried everything I read to no avail. I was about to give up and then realized it could be the motor mounts since when you break or go over bumps the engine does have some movement. Sprayed the most interesting looking motor mounts I've ever seen with silicone spray and the noise was gone! My wife has been complaining for years about this noise and now looking back what a simple solution!. By the way my motor mounts where not worn out, the rubber portion of the mount just needed a little lube.

If it is a tinny rattle, I would suspect a loose heat shield on or above the exhaust. When it is cool, hit the exhaust with your hand at various points until you hear the rattle. If it is a heat shield attached to the exhaust, it can be repaired with a large hose clamp placed around it.

disconnect the shift cable and move shifter to park pull cable hard andreattach also check the switch behind the brake pedal

Hi Norman, Please contact <[email protected]> Regards John

95% of all Oxygen Sensors are in two placesThe Front or Upstream Sensors,the ones that do all the work,reporting oxygen in the exhaust converter,are in the converterinlet & if not, in the pipe just before itSome Foreign Vehicles have them next to the motor but in theexhaust manifoldYou also have Rear or Downstream Sensors called Monitorsthey are in the converter outletThe front ones get replaced at 100,000 miles in my worldor before, if they failThe rear monitor do not get changed ,as they do not do mucheg: they do not constantly switch voltage, as they only look at converter efficiency,the converter should last 12 to 14 yearsIf it does not,then the car has been running with all sorts ofproblems for years90% of all sensors use a 22mm or 15/16" wrench or a similarO2 Socket/WrenchJust because you have a code does not mean you change partsNo Codes tell you what is wrongNo Codes tell you to change somethingI'm guessing after 9 years or more you could meet my100,000 mile rule & change the front 2 if you have 2You won't have the test equip & experience to scope them& watch Voltage or Switching times or Scan Tool Data & Fuel Trim &all that stuffYou go to Rock Auto.Com & buy the best parts avail & cheaperthan the auto parts store even with the shippingGet NGK/NTK or BoschThey may have a different color plastic wire connectormore wire than the OE onesJust loop the wire & wire tiePlastic wire ties are at Wal Mart & Home Depot

Copy and past this link in your browser. You will need this part. My 2003 Silverado did the same thing. Bought this part and its pretty easy to install. Blower motor resistor....this applies the resistance to each speed to allow the fan to have 1, 2, 3, 4, and 5http://www.ebay.com/itm/Acdelco-15-81728-Blower-Motor-Resistor-Power-Control-Module-89019351-/310403498123?pt=Motors_Car_Truck_Parts_Accessories&fits=Year%3A2003%7CModel%3AEnvoy&hash=item48457d808b&vxp=mtr

With the engine running check the voltage at the battery. You should see more than 13.8 volts and better yet more than 14 volts. If you have 12 volts or less than its pretty likely the alternator is no longer charging. I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

I think you should try to check the sending unit for short unplug and see if it moves and look for corrision on plug you may need a new sender.CAT Adapter III