2003 Dodge Neon SXT Evaporative Emission System Leak: Symptoms, Codes, and Fixes
A few weeks ago, my 2003 Dodge Neon SXT began experiencing power loss while driving uphill. The RPM gauge would surge, but the car failed to gain speed—this only occurred on the return trip from shopping; no issues were present during the outbound journey or the first 20 minutes of the drive home. After checking transmission fluid and engine oil (oil was low, so I topped it off), the vehicle ran normally in town until a few days ago. Recently, I noticed a new swishing sound coming from near the front of the car. This noise appears even when the vehicle is idle in the driveway. I tested the car by driving around a circular drive three times without any issues, then parked and let it sit for about 10 minutes—after that, the sound returned. My check engine light has triggered two OBD2 codes: 'Evaporative Emission System Leak (very small)' and 'Evapor-ative Emission Control System Leak (small)'. I'm wondering if these emission-related issues are connected to the power loss or unusual noise. Could this be a fuel system or vacuum leak issue? What should I check first?
The swishing sound might indicate a failing power steering pump—check if you're experiencing any steering issues, such as difficulty turning, hard steering, or weak kickbacks during turns. While the evaporative emission system is related to fuel vapors and vacuum pressure, a loose or faulty gas cap gasket could contribute to both the emission codes and minor surging. However, this sound is less likely to be directly caused by the emissions system itself.