Crank but No start after replacing the water pump?

2003 GMC YUKON
240,000 MILES • 6.0L • V8 • 4WD • AUTOMATIC
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JEREMYM
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The radiator, thermostat and the water pump were replaced only disconnecting the necessary hoses. I reconnected Everything that I took loose, refilled the fluid and reconnected the battery. But it will not start, it will crank urnover, but it will not startup.
Feb 8, 2025 at 5:57 PM
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STRAILER
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Is the security light flashing? If so, this is the problem. You can try a hard system reboot to rest the system. How does the engine sound when cranking normally? Here is a video that will help us:

https://www.youtube.com/watch?v=lXLJbuAZ4CE

If you can upload a short video of the engine cranking over, I can tell if the engine is hurt or not. Also, try starting fluid into the intake to see if that makes a difference. If not, you might be missing spark, this guide can help:

https://www.2carpros.com/articles/no-ignition-spark

Make sure any system grounds that were removed are reconnected as well. Please let us know what happens.
Feb 9, 2025 at 10:49 AM