Crank but No start after replacing the water pump?

JEREMYM

MEMBER
2003 GMC YUKON
6.0L
V8
4WD
AUTOMATIC
240,000 MILES

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.

Saturday, February 8th, 2025 AT 5:57 PM

1 Reply

KEN L

MASTER CERTIFIED MECHANIC
51,841 POSTS

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.

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Sunday, February 9th, 2025 AT 10:49 AM