Question about 1998 GMC Sierra
Testing of the fuel and ignition systems is in order. Intermittent problems need testing when the problem is present, otherwise it won't help find the problem.
I would start by checking for spark on a spark plug wire (or two or three plug wires, in case it may be a bad coil), during those times when it won't start. You need to see a blue, snapping spark to verify ignition system is working.
To check the fuel system, have the fuel pressure checked, and the injector circuit checked. Good that you hear the pump, but you don't know if fuel pressure is correct, or if fuel is getting into the cylinders. One short test is to spray starting fluid or carb cleaner into the intake while engine is cranking. If engine fires up for a few seconds, you know it is a gas related problem.
If ignition system is the intermittent problem, could be failing coil or coils, ignition module, crank position sensor, even the computer, or a wiring problem like a bad connection. Testing of each component will be required, or you could start throwing new parts at it, like many people do, until you find the bad part. Find a reputable mechanic-there still are a few, lol.
Posted on Jul 30, 2013
Testimonial: "it is fuel I have spray starting fluid and it rans and some time it start and rans great and other times it just cranks over and over then some time it starts and rans great has full power and then I shut it off it could start or it could just cranks over could it be FUEL PRESSURE SENSOR or the fuel pressure regulator or FUEL FILTER and thanks for all your help man"
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Posted on Jan 02, 2017
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: i have a 1999 gmc
If i understand you right the truck has been sitting for two years.If it has been sitting that long without running or moving the gas has turned to varnish...I suggest that you drain and refill the fuel tank,and replace the fuel filter located on/in the frame rail on drivers side.
Posted on Jun 18, 2011
If you are at or near the 100,000 mile mark then your fuel pump may have failed. If you remove the fuel filler cap and listen carefully at the filler neck while someone turns the ignition key to "run" [don't actually crank the engine] you should be able to hear the fuel pump buzz for about a second and a half as the key is turned On. If you don't hear the pump buzz then odds are your pump is dead. Your pump may have actually failed making it appear as though you ran out of fuel. Not to uncommon. Hope this helps and good luck!
Posted on Nov 03, 2011
THAT PART ABOUT BARELY GETTING HOME BOTHERS ME LOW VOLTAGE TO COMPUTER CAN BURN IT OUT HAVE IT TESTED GOOD LUCK CHECK RED FUSES
Posted on Jan 31, 2012
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