Question about 1999 GMC Sierra 3500
Posted by Anonymous on
You can have someone stand by the truck and they should hear the pump kick on when you turn the key in the on position. Can you spray fuel into the throttle body and will it start that will tell you if the ignition is ok or not and also tell you if you have fire to the cylinders. If it start right up and shuts off you either have a bad fuel filter, fuel pump or a plugged catalytic converter in the exhaust system.
Posted on Jun 10, 2017
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Posted on Jan 02, 2017
You may have a problem with the contacts in the ignition switch (not key part), when you crank the engine a signal is sent to the fuel pump to run, when it starts and you let off the key another set of contacts keeps the pump getting power Through a relay), these are known as crank and run modes.
Posted on Aug 04, 2008
Hey there boatright33,
A few things things immediately come to mind.
There may be a problem with the engine controller. You could check the ODBII onboard diagnostics. Auto part stores will usually do this for you at no cost.
When you pulled the ones that were/went bad, how did the filters look? Could there be particulate matter still in the tank causing them to fail.
I always put this one off until last. Check the injectors. Are they gummed up?
Let me know what you find out
Posted on Aug 12, 2008
SOURCE: 2000 GMC Jimmy will not start
The oil presure switch does have some bearing on the problem but my suggestion is to change the coil. I had a the same problem with an astro van. I changed everything that you have described and it fixed the problem just for a little while and then all of a sudden did it again. I changed the coild and the cold start swithch and never had the problem again.
Posted on Nov 29, 2008
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