Question about 2003 GMC Envoy

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Change coils on 2003 gmc envoy

Change coils

Posted by Anonymous on


6 Suggested Answers

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Posted on Jan 02, 2017

  • 4 Answers

SOURCE: How to replace the headlights on my 2003 GMC envoy.

The headlights on the envoy are the easiest parts of the car to repair. You just pull the two tabs at the top of the headlights, screw out the bulb containers and you are good to go

Posted on Nov 15, 2008

  • 691 Answers

SOURCE: how do you change brakes on a 2003 gmc envoy

don't need any special tools, standard sockets sets, "C" clams is a must unless your a He-Man and wrench set, plyer or needle nose will do. I assumed being 2003 your rotor never have been turn and i recommend every time you change your bakes is good idea to have your rotor turn. reason is it will make your pad last lot longer, removed any vibration and better even wear on the pad and eliminate any squealing although is not necessary to do so. make sure you get extra break fluid to bleed the brakes. get your self 5 feet long smallest vacum rubber hoses and a glass jar to bleed your brake fluid in. the rubber vacum hose you going to use to fit on to the bleeding nipple and run the other end of line to your the glass jar to save the brake fluid when you bleed the brakes. when removing caliper, check inspect make sure the rubber seals around your piston look good and not crack or deteriorated. before applying new pad make sure you open the bleed valve to reduce the pressure by turning the bleed nipple counter clockwise and leave it open attach that rubber hoses to the nipple because you going to press on the piston back into it housing with the "C" clamp in order for new pad to fit. becareful not to damage the rubber seals around the piston. its going to take lots of effort to push that piston back in so be a bare with it if needs to. once the pad is back in make sure you keep the reservoir full with brake fluid and then bleed the brake. two people is a good idea to do brake. one will do the pumping the brake and holding it down and other will bleed the nipple. I bleed it 2-3 time will do the job. good luck!

Posted on Jul 17, 2009

  • 20 Answers

SOURCE: 2002 GMC Envoy Coil Packs / Coil Module Assembly's going bad

swap it with another and check the code again to ensure that it is coil pack 3. This car doesn't have adiquate sensors to diagnose this properly and may indicate the wrong coil. Yes this is comon, its happened to me and I have the same make and model.

Posted on May 30, 2010

  • 5763 Answers

SOURCE: where is coolant temp sensor located on 2003 gmc

heres a diagram to show you where the coolant temp sensor is located, its behind the alternator on the left side (driverside),the sensor just unplug the connector and then unscrew it and out it comes.

Posted on Jun 21, 2010

  • 6826 Answers


Fuel Filter Removal & Installation 2002-2004 To Remove:
NOTE: If a fuel filter is restricted, clean and inspect the inside of the fuel tank.

  1. Relieve the pressure in the fuel system.
  2. Lift the vehicle.
  3. If necessary, remove the fuel tank shield from the frame.
  4. Make sure the fuel pipe and hose connections, as well as the surrounding areas, are clean.
  5. Disconnect the fuel pipes from the fuel filter; keep the retaining clips with the filter.
  6. To avoid fuel loss and fuel system contamination, cap off the fuel pipes. Fuel filter removal and installation gm-05-00-1542.gif

  7. Remove the screw from the fuel filter bracket.
  8. Remove the fuel filter from the fuel filter bracket.
To Install:
  1. Install the fuel filter into the fuel filter bracket.
  2. For vehicles with a 4.2L engine, install the screw into the fuel filter bracket. Torque the screw to 13 in-lb (1.5 Nm).
  3. For vehicles with a 5.3L engine, install the screw into the fuel filter bracket. Torque the screw to 106 in-lb (12 Nm).
  4. Uncap the fuel pipes.
  5. Connect the fuel pipes to the fuel filter.
  6. Turn on the ignition for 2 seconds, with the engine off, and then turn off the ignition. After 10 seconds, turn the ignition back on with the engine off.
  7. Check for leaks in the fuel lines.
  8. Lift the vehicle.
  9. If previously removed, install the fuel tank shield to the frame.
  10. Lower the vehicle.
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Posted on Jul 08, 2010

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Related Questions:

1 Answer

Changed spark plugs now no spark 2003 envoy

Coil packs was the problem in the first place. When a spark plug misfires, the high voltage goes no where and the coil starts to deteriorate. After prolonged misfire the coil will not make the hi voltage necessary to fire the plug. Replace the coil packs.

Jul 07, 2014 | 2003 GMC Envoy

2 Answers

Cylinder 3 location on a 2004 gmc envoy

The coil pack will be numbered. Find coil #3 and follow the spark plug wire to the spark plug.

Jun 15, 2014 | 2003 GMC Envoy

1 Answer

My 2003 gmc envoy has p0303 error code. I have since changed the plugs but the code is still there. What else should I look at before changing the expensive coil on cylinder 3?

To find out if it is the coil pack, swap #3 pack with another cylinder and see if the fault changes. If not, you should check the compression on cylinder #3. If that is OK, I would suspect a bad injector.

Dec 28, 2012 | 2003 GMC Envoy

1 Answer

Changed spark plugs on 2003 gmc envoy 4.2lno runs bad

First of all, did you use AC Delco Iridium plugs part number 41-103? These are the best plugs for this engine.
Second, did you firmly seat the coil pack when reinstalling them on each plug?
If it is running bad, are you getting the Check Engine light coming on? If so, what is the code?
When you changed the plugs, did you disconnect the battery? If you did, the rough running could mean that the throttle body should be cleaned.

Nov 11, 2012 | 2003 GMC Envoy

1 Answer

Were are the spark plugs on 2003 gmc envoy 6 plugs

The spark plugs are located on the top of the engine, you have to remove the airbox to access the coil pack (1) and then the plugs (5) (see picture)


May 29, 2012 | 2003 GMC Envoy

1 Answer

I recently purchased a 2003 envoy and I was used to driving a chevy van for work which has more responsive steering than the envoy. Is there any suspension components that I can change to make the envoy...

Changing the struts and coil springs will only change the ride of your vehicle, not the responsiveness. In order to change the responsiveness you'll need to change out the steering gearbox and a more responsive gear box may not be available. The gearing in your gear box can be changed but it will be very expensive to do and time consuming, as this is a very difficult job. I'm sorry this is not a positive answer but I want you to be aware of what you're up against.

Nov 26, 2010 | 2003 GMC Envoy

1 Answer

Is it hard 2 change a coil pack on a 2003 6cly gmc envoy

Not really. You have to remove the plastic air intake.

Mar 27, 2010 | 2002 GMC Envoy

1 Answer

Where are the sparkplugs on a 2003 gmc envoy

You have a 4.2L inline 6 cylinder, on top of engine you'll see six coil pack's running front to back on top of the motor, disconnect harness on each one remove small bolt's pull all six coil pack's out, spark plug's will be in there.Don't worry you don't have to put the coil pack's back in the same hole.

Dec 12, 2009 | 2003 GMC Envoy

1 Answer

2003 gmc envoy tune up??looking for the wires??? and lookking for the plugs

The engine has a coil on plug design. You will have to remove the black housing connected to the throttle body, then remove the coils to get the spark plugs out.

Nov 01, 2009 | 2003 GMC Envoy

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