Question about 1998 GMC Sierra
If you have the spider fuel system, I always check that first. That fuel system is noted for problems. In the past, I saw a service bulletin about hard to start after setting overnight. Once you got it started, it would do fine the rest of the day. The next morning, the same thing. The injector poppets were sticking after the vehicle set overnight. The fix was a cleaning procedure, the procedure I saw was a shop procedure.
I can't rule out moisture issue? Engine running, raise the hood in the dark, can you see fire running everywhere or jumping. Did you check for moisture in the dist cap?
Posted on Nov 06, 2017
Do you own a professional type scan tool that show's engine sensor data ?
048 Engine Hard to Start or No Start Scan Data for Starting Problems
003 Fuel System Tests Scan Data Tests
Posted on Nov 06, 2017
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Posted on Jan 02, 2017
Defrost is the default position. Is the control a autyomatic temperture control unit? ( you set the temp and select automatic) if it is the system is completely electronic. You push the buttons and the control still says defrost or can you select something else and the control shows it but it just keeps coming out the defrost? If the control changes and the air comes out the defrost anyway and the cheack engine light isn't on, then the problem can be blown fuses or an air door actoater not working. Does the dash emit a clicking sound? if it does with the covers off the bottom of the dash reach around touching the different pieces till you touch the idem that is clicking. this is an acutor motor, or blend door motor. they have gears in them that wear out and break the motors aren't repairable and you just replace the ofending motor. the door that is moves can be stuck. and may have to be freed up with blaster, WD40, or other rust buster till it moves easy. maybe after getting the door to move smoothly you can get the old motor to move the door wiithout having to install a new one.
Posted on Jan 06, 2010
COULD BE BAD IGNITION COIL OR MODULE.IT COULD BE BAD FUEL INJECTOR OR INJECTORS.CLOGGED FUEL FILTER. A BAD DISTRIBUTOR CAP ROTOR + BAD PLUGS AND WIRES WILL CAUSE PROBLEMS AND BAD FUEL WITH WATER IN IT.
Posted on Mar 01, 2010
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