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Envoy

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Question
When i slow down my GMC Envoy shuts off and makes a humming noise like a toy car, told to replace the engine, noise is still there
If the humming noise occurs when the car is stationary with the engine on at any RPM, then it is engine or transmission related but the noise could originate from an accessory drive on the engine. However, if the noise...
Question
Transmission fluid leak
Hello. If you have transmission fluid coming from the front of your vehicle, then you either have a ruptured cooler line or the radiator has cracked where the cooler lines go. I would start by getting under the vehicle to...
Question
Stuck in reverse
Hi there, thanks for writing in. Sounds like you may need to check the shift linkage. It most likely came off at the transmission shift control arm. The plastic bushing for the shift cable falls apart over time, and then...
Question
Oil Pressure Gauge
This light will usually come on when one of two things are happening. Either the motor is in fact low on oil or the oil pressure sending unit is not working properly and may be producing a faulty reading. I...
Question
My truck is running rough
Having a rough running vehicle is never a pleasant experience. Unfortunately there can be quite a few reasons as to why your GMC is running rough for you. With the limited information, and not being in front of the car,...
Question
My check engine light is on
A vehicle that has a problem with the engine or power train can turn on the check engine light and set a code in the computer. The list of possible codes and problems are in the hundreds. You will need...
Question
Knocking from engine.
Unfortunately without more information it will be difficult to narrow down why you are experiencing a knocking sound in your vehicle. In my experience Envoys have had many different reasons that could duplicate an engine knock. The most common is...
Question
Key not turning in the ignition.
It is a common problem with this car to have the key wear down and not trigger the tumblers in the key cylinder. The only fix will be to replace the key assembly and switch. I would suggest having a...
Question
Fuel gauge not working.
Hello. This is a common concern typically caused by a failing fuel level sensor. The fuel sending unit is the term used to describe this component, and is generally found inside the fuel tank. The level sensor and fuel sending...
Question
Car won't go into gear.
When you shift through the gears does your car want to roll freely at all? If the car will roll this is indicative of a failure of your automatic transmission that would need to be diagnosed by a certified transmission...
Question
AC blowing out warm air again
If this happened right after the work was done then you either have a leak in the system that allowed the refrigerant to come out or there is an electrical issue. It is possible that this was overlooked if the...
Question
Rough idle, dip in idle, no acceleration power, replaced cam postion senor, cleaned pistons, spark plugs, and vvt what else?
You should have the computer scanned for misfire codes to see if one or more cylinders are misfiring and may have a bad coil or plug wire boot. Also check for vacuum leaks in the intake gaskets since any of...
Question
Fuel pump fuse blowing
One of the most common causes for fuses to blow consistently as a shorted wire. There is either a short to positive which means that one wire that has power is shorting with another wire that has power. You could...
Question
2003 gmc envoy ignition got broken from someone and i need to drive it how can i bypass the anti-theft locking system???
The anti theft system is integrated in the engine and body computers and cannot be bypassed. You will need to replace damaged component and if you have original key the system will start with old key held next to new...
Question
2003 GMC Envoy has oil in the throttle body
Oil in the air intake and throttle body indicates blow-by. Blow-by refers to the combustion gases that leak past piston rings during engine operation. The positive crankcase ventilation (PCV) system is designed to prevent these gases from leaking into the...
Question
My gear when in park doesn't allow ME ro take my key out I have to push up real hard to take out the key..
Hello, thank you for writing in. We need to determine if the key is getting stuck in the ignition cylinder, or if the shifter is not registering as being in park. First, make sure nothing is stuck in the way...
Question
Hello ! I have a problem with my ac compressor clutch, it won't engage unless I push it manually
It sounds like you may have a damaged AC compressor clutch. As you may know the AC Clutch is the pulley that spins with the Belt. There are two ports on the rear of the Compressor. One is a Suction...
Question
I took my 04 GMC Envoy to better brakes for less as I needed to have it pass smog and the check engine light was on. They said I n
Inasmuch as YourMechanic is mobile, you need not bring the car anywhere as the certified mechanic will come to you and take care of the radiator replacement. If you desire mobile replacement, please simply use YourMechanic's radiator replacement service page....
Question
Reduced engine power on GMC Envoy 2003
The issue you are writing in about is common enough that a specific diagnostic, namely a Reduced Engine Power Warning Light Diagnostic is performed by technicians dispatched by YourMechanic. If you request that diagnostic, the responding certified mechanic will get...
Question
How do you remove the torque converter bolts off the flywheel? 2005 GMC Envoy Denali
Hello - with the vehicle safely supported to provide clearance underneath - in between the engine oil and transmission pan, there is a large, funnel-shaped aluminum casting (called the bellhousing), that physically mounts the engine to the transmission. At the...

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