Question about GMC Cars & Trucks
2004 GMC Envoy SLT 4.2L i want to check the fuses the engine will turn over but want start no spark at the spark plug boots.
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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
check to see if the starter itself is getting a signal to crank. youll need to use a test light and have someone else try to start the vehicle, while you probe the wire to the starter to see if it is getting power. if not, check the starter fuse to make sure its not blown, as well as the starter relay to make sure that is good too (very common on gm's for bad relays) if the fuse and relay are good, but your not getting signal, it is an ignition switch problem.
Posted on Dec 11, 2008
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