Question about 2004 GMC Yukon

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Can't get metal spark plug covers back in to place

Hi, I have a 2003 GMC Yukon and I'm trying to change the spark plugs. The spark plugs have some kind of metal tube over them that comes out when I pull off the spark plug wire. What are the metal covers? Do I need to put them back on? If so, how do I get them back in? Also, they have a small spring on the end facing the engine. Thanks, Jeff

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How to take spark plug wires off 2003 yukon xl

Posted on Oct 14, 2009

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There is a GM special tool for removing these heat shields, without the tool you will destry the plug boot getting them off.

Posted on May 15, 2009

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The "method" for removing the plug wires and heat shield from a 2003 Yukon is a half turn to the right and then again to the left. This will "release" the plug wire and they should then pull free like any other wire. "special tools" are for special tools. Replace these wires in the same manner in which they came off. Attach and then gently press as you turn them half a turn left and then half a turn right.

Posted on Nov 15, 2012

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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

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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

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2003 yukon cut off but start right back up

sometimes the idle is low or the engine still cold or possible low charging system.clean your spark plug make sure 30 thousand miles...or every 25 to 30 thou to change.

Apr 04, 2011 | 2003 GMC Yukon

1 Answer


Remove the wire from the top of the spark plug by twisting and pulling on the boot part. Then you will need a 14 milimeter plug scocket wrench, turn the wrench counter-clockwise to remove. You install them by doing the steps in reverse. A note of caution: the tightening force is 15 foot pounds of torque whitch isn't a lot of force.
The original spark pulgs are good for at least 100,000 miles unless it's had a problem to cause them to fail. Also installing a different type plug then original equipment has lead to poor performance at times.

Feb 13, 2011 | 2003 GMC Yukon

1 Answer

Replacing sparkplugs on a 2003 YukonXL 5.3 Litre

Here's how to remove the spark plugs.

  1. Remove the engine sight shield, if necessary.
  2. Disconnect the spark plug wire from the spark plug. • Twist each spark plug wire 1/2 turn. • Pull only on the boot in order to remove the wire from the plug.
  3. Loosen the spark plug 1 or 2 turns.
  4. Brush or air blast away any dirt from around the spark plug.
  5. Remove the spark plug. If removing all the plug at one time, place each plug in a tray marked with the corresponding cylinder numbers.
Installation Procedure
  1. Inspect the spark plug gap. Adjust the plug as needed. Specification
    Spark plug gap: 1.524 mm (0.060 in)
  2. Hand start the spark plug.
  3. Tighten the spark plug. Tighten • For used heads tighten the plug to 15 N·m (11 lb ft). • For new aluminum heads tighten the plug to 20 N·m (15 lb ft). • For new iron heads, tighten the plug to 30 N·m (22 lb ft).

Aug 12, 2010 | 2003 GMC Yukon XL

1 Answer

Change sparks plug wires on my 2002 yukon denaili


Jun 30, 2010 | 2002 GMC Yukon Denali

1 Answer

Difficulity removing spark plug caps to replace spark plugs in 2002 GMC Yukon

This is normal for the boots to be stuck on it is a very tight fit to begin with and the heat that is generated around them cause them to stick. Try rotating the boots back and forth twisting action as you pull up.If this doesn't work there is a tool available to remove spark plug boots at most autoparts stores.

Jun 06, 2010 | 2002 GMC Yukon XL

1 Answer

I have a p0303 code on my 2003 yukon. i have changed my spark plugs and wire and the problem still exist. can any one help. thanks


May 18, 2009 | 2003 GMC Yukon Denali

1 Answer

2003 yukon xl 5.3l flexfuel all plugs lean on passenger side

P0131 - Heated Oxygen Sensor (HO2S) Circuit Low Voltage

P1133 - Heated Oxygen Sensor (HO2S) Insufficient Switching Bank 1 Sensor 1

Bank 1 Sensor 1
P0300 - Engine Misfire Detected

I would check for vacuum leaks, maybe intake or brake booster

Dec 16, 2008 | 2003 GMC Yukon XL

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