Changed water pump and timing belt now a 2.4 liter will not fire?

If your 2.4-liter engine won't fire after changing the water pump and timing belt, it's possible that the timing belt is misaligned, causing the engine's timing to be off. Check to ensure that the timing marks on the crankshaft and camshaft are correctly aligned. Additionally, verify that all electrical connections, including the ignition system and fuel injectors, are properly reconnected. If everything appears correct, consider checking for fuel delivery and spark to diagnose further.