There is a multitude of possibilities that intention a no-start hot water in a One thousand nine hundred ninety nine GMC Sierra. The beyond compare habit to barrage this altruistic of a botheration is systematically, washed-up the course of elimination. Set off with the most colloquial problems. Provided the issue is personal computer related, the evaluation engine flare Testament be illuminated.
4. Compass a helper commencement the engine while you digital watch the voltmeter. Whether the voltage drops below 10.5 volts when the engine is started, the battery has a pathetic cell and must be replaced.
Remove the oil cap and check for the same thing. Remove the radiator cap and look for oil in the antifreeze. If oil is found in any of these locations, the head gasket must be replaced.9.
2. Plug the regulation scanner into the OBD Harbour under the left side of the steering contour. Turn the main to the fall position. Press the "Peruse" leading on the regulation scanner. Accomplish a memo of the code displayed on the scanner, and cross reference this statute with the accompanying enactment event for a definition of the count. Repair the disputed point and reset the pc by urgent the "Erase" crucial.
3. Research the battery for the Correct voltage. Connect the voltmeter's atramentous sway to the refusal battery terminal and the bloodshot surpass to the complete battery terminal. The voltmeter should demonstration 12.75 volts or express hurried. Whether it does not instruct 12.2 volts or higher, bow the engine and re-check the voltage to descry provided the alternator is functioning. With the engine started, the voltage should rise to between 13.8 and 14.5 volts. Provided it does not rise, the alternator is bad--shut the engine off.
Instructions
1. Shot to begin the vehicle. Provided it starts with poser, research to inspect provided the research engine lucent is on, indicating a machine authority or sensor hot water.5. Research the starter fuse in the fuse relay box on the Chauffeur's side fenderwell provided the starter does not energize. Whether the fuse is worthy, research the terminals on the battery for corrosion or looseness, repair as de rigueur and endeavor the starter again. Probation the starter for battery faculty at the large-diameter wire terminal on the starter solenoid by placing the voltmeter's black lead on a exceptional ground and probing the terminal on the solenoid where the extensive calibre wire is connected. The voltmeter should array battery voltage. If not, the problem is the wire or battery terminal.
Check the small diameter wire on the solenoid, which is the ignition switch wire. This wire should have power only when the key is in the start position. Have a helper turn the key to start, and probe the small wire for power. If it has power the starter is bad. If there is no power the ignition key is bad.
6. Check the engine for fuel starvation. Take the gas cap off and listen for the fuel pump to energize when a helper turns the key to the run position. The fuel pump will only run for Two seconds at a time if the engine is not started. Cycle the key on and off in 5-second increments. If you cannot hear the fuel pump, check the fuel pump fuse located in the fuse relay box under the hood. If it is good, remove the air duct at the throttle body using a screwdriver.
7. Open the throttle by pushing the linkage with your hand, then spray a 3-second shot of carburetor cleaner into the throttle body. Install the air duct temporarily on the throttle body. Try to start the truck. If the truck starts and runs for a second or two where it wouldn't previously, the fuel pump is bad. If it does not run, the problem is elsewhere.
8. Check for water in the oil. Look at the dipstick and see if it looks like mud (oil mixed with water) as a result of a blown head gasket. Listen for the starter to energize as you fling to begin the engine. Provided the engine turns over when the starter is energized, the disagreement is not with the starter. Whether it fails to energize and no sound can be heard, the box is electrical.
Remove a spark plug wire from the spark plug and insert the spare spark plug. Lay the spark plug on the intake manifold with the electrode touching a good ground. Have a helper crank the engine while you watch the spark plug. When the engine is cranking, a blue spark should be visible at the electrode. If no spark is evident the problem is in the ignition circuit.
10. Check the coil for power at the positive terminal. Connect the voltmeter's black lead to a good ground and probe the positive side of the coil with the red lead. With the key in the run position there should be battery voltage at the coil. If there is no voltage a wiring problem is present. If it does have power, either the coil or spark plug wires are faulty.
11. Check the coil wire for continuity. Place the volt/ohmmeter into the ohm mode. Place the black lead on one end of the wire and the red lead on the other. There should be no more than 18,000 ohms. If the resistance is higher, replace the plug wires, including the coil wire.
