Question about 2004 GMC Envoy
Posted by Anonymous on
Sensors for the engine control module or the module itself change timing . If something goes wrong, the module goes into what's called the limp in mode. It keeps the engine running so you're not stranded. It only allows limited driveability, just enough to get you home or to a repair shop.
Posted on Jul 24, 2016
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Posted on Jan 02, 2017
The plugs are accessible from the top of the engine, there is an individual coil pack over top of each spark plug (they are kinda egg shaped and they have a little heat sink in them) just pull these out and below you will find the spark plug. you may have to remove the air intake to gain access to them.
Posted on Nov 02, 2008
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
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