Question about GMC Envoy
I have an 03 envoy was running fine but almost out of gas,drove 27 miles to a job interview was a little early so went and filled it up with gas drove about a mile to the interview.Came out an hour later drove a mile when the thing shut off and would not start,battery drained from tryimg to start left it set for an hour and a half jumped it ran fine started fine until the next day was leaving in it and it shut off again and has not started since.does that sound like fuel pump issue or crankshaft sensor issue ro any ideas?
Do you hear the pump come on briefly with key in run, not start? You should check fuel pressure-some parts stores rent a fuel pressure tester for small fee. Or try this: spray some starting fluid into the air intake when trying to start. If it starts and runs a few seconds, you know you have a fueling problem- pump or injectors or something with the fuel.
Always check for trouble codes with a no start. If checking for spark and have no spark to the plugs, then it could be the crank position sensor. That sensor is crucial for the computer to figure spark timing. But if no spark, it could be other things as well, like the cam position sensor, ignition control module, or a problem in the circuits for all these. The crank sensor is just an educated guess for no spark-not a certainty.
Since it won't run, you can't go to have the computer scanned for free at a parts store-do you have any friends or relatives with an OBD-2 hand held scanner? Just to check for any trouble codes, but do check for fuel and spark.
Posted on Feb 16, 2014
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Posted on Jan 02, 2017
you are right, its probably the fuel filter. wow 113120 miles without changing the fuel filter. also, change the air filter and have your intake manifold cleaned. this will greatly improve acceleration and fuel economy. best wishes - hotratchet
Posted on May 01, 2009
SOURCE: I have a 1998 K2500
Hate to say after the fact, just maybe non of the pumps were bad
I would only work on that issue when I had a complete vehicle wiring diagram to study,or at least all of the fuel system.
Relay,bad or loose grounds,almost anywhere that drops something effecting to fuel system,any modules if applicable.
Kind of a logic problem,with a twist of testing. Can't do anything without a window into your issues (The Wiring Diagram)
A loose wire on the ignition switch,pulled out of it's terminal. Any other things stop working. See why I want all the wiring schematics!
Posted on Sep 29, 2010
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