Question about 2003 GMC Envoy
DOES EACH SPARK PLUG HAVE ITS OWN COIL
Hope not too late to help. I have changed all plugs 2 times now myself. Mine is a 6 cylinder. The rear 3 plugs are impossible to remove without unbolting the intake manifold and other contraptions like the throttle/cruise control cable
and 4 inch air intake tube. If you have engine work experience, great!
If not, color code every disconnect then match up on the reinstall
including plug cables.
Here is where you might not know what to do. First, the gasket (Planum) is a reusable metal gasket. Their is no replacement at Kia (crazy but I asked everywhere in NC) so be sure to tighten each bolt on the intake alternating and to speck amount, a 12 foot socket 1/4 inch wrench is plenty of torque so don't overdo it. I believe 15 lbs of torque is correct but verify. If you like taking risks just tighten using your wrist only (not biceps mustle) as tight as you can using wrist only now! [Rent a torque wrench or buy for $10 - $20 if you don't own one].
Since your doing all this work, change all plug wires and only use Platinum or better plugs that last at least 60k miles of use. You wont be able to change back 3 wires later by the way so buy 3 OEM Kia wires (not the kit) to save money if you want. I mixed plugg types and mine ran just fine!!
Plan on 4 meticulous hours your first time. My 2nd time took 1.5 hrs with a short break.
Posted on Apr 02, 2009
they come pre gapped with collars to prevent the electrodes from getting bent .platinum and iridium plugs will have the surface damaged if you were to adjust them with a feeler gauge,like old plugs had to be gapped. ac or ngk plugs come pre gapped in the box.
Posted on Aug 22, 2009
SOURCE: CHANGE SPARK PLUGS
Well first you will want to get the right size spark plug socket , the rigt sized one for your envoy and then next you will want to remove one spark plug wire at a time so you do not cross any of the wires or if you do you will mess up the timing for the envoy now how to remove a spark plug wire, look first at the plug wire and then gentky twist the wire on the end that goes over the spark plug and carefuly pull back but do not break the wire, next with an extention and the socket put the socket over the spark plug and turn the plug counter clock wise until you have removed the plug and then put the new spark plug in and place the spark plug wire back on the spark plug and just repeat the prosses on the rest,agin do them one at a time that is how I change spark plugs and wires and i have been doing it for years.
Posted on Sep 15, 2009
Tips for a great answer:
Jul 07, 2014 | 2003 GMC Envoy
May 29, 2012 | 2003 GMC Envoy
Sep 15, 2011 | 2007 GMC Envoy Denali
May 09, 2011 | 2004 GMC Envoy
Oct 17, 2010 | 2004 GMC Envoy
Sep 12, 2010 | 2005 GMC Envoy
Jun 30, 2010 | 2001 Ford Expedition
Jun 23, 2010 | 2003 Saturn ION
Sep 19, 2009 | 1993 Oldsmobile Eighty Eight
Sep 18, 2009 | 2003 GMC Envoy
Feb 19, 2017 | 2003 GMC Envoy
1,627 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: