Answer
Sep 05, 2025 - 05:50 PM
If your 2005 Nissan Titan is losing power when going uphill or under heavy acceleration, there are a few common things to check:
- Fuel delivery – Weak fuel pump, dirty fuel filter, or clogged injectors can starve the engine when it’s under load. Feels fine cruising, but struggles when you ask for power.
- Mass Air Flow (MAF) sensor – If it’s dirty or starting to fail, it can misread airflow and cause the engine to run lean — especially noticeable on inclines.
- Throttle body or pedal sensor – Drive-by-wire Titans can have lag or hesitation if the throttle body’s gummed up or the sensor’s acting weird.
- Exhaust restriction – A clogged catalytic converter can choke the engine when you're on the throttle hard, like going uphill.
- Transmission – If it’s not downshifting properly, you’ll feel like you’re losing power. Could be a sensor issue or fluid level problem.
- Knock sensor – These trucks are known for false knock sensor readings, which can cause the ECU to pull timing and kill power, especially under load.
Start with a code scan — even if there’s no check engine light, stored codes can help point you in the right direction.
Of course, not much troubleshooting advice we can give you here, given the limited information. For more details like DTC codes, troubleshooting charts, and wiring diagrams, I recommend you grab this 2005 Nissan Titan OEM Service & Repair Manual. It includes step-by-step instructions, clear images, and exploded-view illustrations to help you fix your Titan properly.
