Question

2000 Infiniti G20 with engine code P1440, what could the right part to fix the problem? with my car, it jerks when I drive it and it has struggle going up hills.

Answer 1

You might have a loose or bad gas cap which is the first thing to check/replace

you can also check for intake leaks near the EVAP system and engine bay.

Possible causes

- Incorrect fuel tank vacuum relief valve

- Incorrect fuel filler cap used

- Fuel filler cap remains open or fails to close

- Foreign matter caught in fuel filler cap

- Leak is in line between intake manifold and EVAP canister purge volume control solenoid valve

- Foreign matter caught in EVAP canister vent control valve

- EVAP canister or fuel tank leaks

- EVAP purge line (pipe and rubber tube) leaks

- EVAP purge line rubber tube bent

- Blocked or bent rubber tube to EVAP control system pressure sensor

- Loose or disconnected rubber tube

- EVAP canister vent control valve and the circuit

- O-ring of EVAP canister vent control valve is missing or damaged

- EVAP canister is saturated with water

- EVAP control system pressure sensor

- Absolute pressure sensor