Question about 2004 GMC Envoy
2004 GMC Envoy SLT 4.2L engine will turn but want start i want to test for injector pulsa but i don't know where it is i believe this vehicle have a throttle body can you send me pictures showing how to test for injector pulsa.
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Posted on Jan 02, 2017
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
SOURCE: charge ac
It is located under the hood in the larger of the 2 AC lines, this large line is the low pressure line, also check on the round can the low side line connects to as it can be on that as well, that part is called the Accumulator/reciever drier
Posted on Apr 26, 2009
SOURCE: 1988 gmc k1500 wont start
hi, check the connections at the ecm,i think it's under pass front seat,i've had a couple of those years loose injector signal at ecm connector,if you have a test light you can unplug injectors and test across terminals ,it's a 12v signal at inj ,if lights flash on both while cranking try plugging in one at a time and see if either sprays, if one does and not the other, you would have a shorted injector
Posted on May 06, 2009
the injectors are fired thru the engine cotrol module but it gets its signal to fire from the pick-up located inside the distributor if you are loosing injector pulse only the ignition module is bad if you are also loosing spark when you loose injector pulse your pick up is causing the problem if you replace the pick-up i recomend you change the ignition module when doing so because they work together and you have to remove the distributor to change the pick-up
Posted on May 31, 2009
electronic dizzy modules do this when they get warm they cut out but can start up again within minutes !
very commen fault!
get it checked or borrow one
Posted on Aug 15, 2009
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