* Alternator: This is the most likely culprit. Even with a new battery, a failing alternator won't recharge the battery. The strained engine sound could be the engine struggling because the battery isn't getting recharged and is rapidly losing power. Have the alternator tested at an auto parts store – most will do this for free.
* Starter: A weak or failing starter motor can also cause a strained engine sound when cranking. If the alternator is good, the starter is the next suspect.
* Battery Cables and Connections: While you got a new battery, ensure the cables connecting the battery to the starter and the alternator are clean, tight, and free of corrosion. Loose or corroded connections can prevent proper current flow.
* Poor Ground: A poor ground connection somewhere in the car's electrical system can cause similar starting problems. This is less likely but possible.
* Plug Wires: While possible, worn plug wires are more likely to cause misfires and rough running *while the engine is running*, not necessarily prevent starting. They're less likely to be the primary cause of your current issue.
* PVC (Positive Crankcase Ventilation) System: A clogged PCV system won't directly prevent starting, but it can affect engine performance over time and contribute to other problems. It's less likely the main cause here.
Troubleshooting Steps:
1. Test the Alternator: This is the most important step. Get it tested at an auto parts store.
2. Check Battery Cables and Connections: Carefully inspect the battery cables for corrosion, looseness, and damage. Clean the terminals if needed.
3. Have the Starter Tested (if the alternator is good): A mechanic or auto parts store can test the starter motor.
4. Consider a Professional Diagnosis: If you're not comfortable doing the above checks yourself, take the car to a mechanic for a proper diagnosis. They have the tools and expertise to pinpoint the problem more quickly and accurately. Describing the symptoms (needed a jump last week, new battery, strained engine sound) will help them.
Don't keep trying to jump-start the car repeatedly, as you risk further damaging the battery or other components. Focus on identifying the underlying cause of the problem.
