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L6-4.2L

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Question
When I turn left clunking sound and when steered right a rubbing sound abs and stabilitrak light is on
Hi Adele. Thanks for contacting us today. There are several possible reasons why your warning lights are illuminated, and likely are the source of the noises you're hearing as well. Some of the possible sources include worn tie rod ends,...
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
Why is my car making a rattling noise when i accelerate
Hello, thank you for writing in. The vehicle may be having a catalytic converter issue. When the catalyst inside of the unit fails, it can chip off into chunks and rattle around in the case. The sound amplifies when the...
Question
Transmission slipping.
Hello. Fluid pressure is used inside the automatic transmission to convert the engines rotation into working torque. Any major leak inhibits operations, fluid pressure cannot build properly, and the transmission starts to slip as it cannot transfer the power. There...
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
Stuck in reverse
Hi there, thanks for writing to YourMechanic. It can be difficult to drive a vehicle with it stuck in reverse. The problem seems to be a plastic grommet that connects the gear shift assembly to the transmission. It sounds like...
Question
Smoke coming out of tailpipe
If the smoke is white, you're burning coolant, if the smoke is blue, you're burning oil, if the smoke is black, you're running rich (too much gas). A qualified technician, like one from YourMechanic, can help you identify the problem...
Question
service engine soon
There is a TECHNICAL SERVICE BULLETIN for the problem and need to reprogram the PCM to a new level. The code is for a cam sensor signal being misread by computer and this TSB needs to be done before replacing...
Question
Power problems
Hi. Other owners have reported similar symptoms with their trailblazers. The first and easiest thing to check would be the 125A mega fuse under the hood. This is located right outside the under hood fuse box and has two big...
Question
Overheating
For the sake of clarity, it is important to distinguish when the car is overheating. If it is overheating when the car is moving, then the fan clutch isn't your only problem. If the car only overheats at a stop,...
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
Engine misfiring
I would suggest checking the timing and checking for vacuum leaks. Misfiring is typical when the timing is not accurate as it relays inaccurate orders to your car's ignition system. Vacuum leaks can also cause this as they can create...
Question
Charging system light on
Hi there. There is a possibility that your alternator or charging system may have experienced a failure. In the case of a charging system failure, the battery's charge cannot be kept and the battery drains during vehicle operation. Once the...
Question
Car won't start
Hello. I usually start by checking the battery. If it is low enough these other systems will work but there will not be enough power to engage the starter. If the battery is fine then most of the time this...
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...

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