* Injector Issues (Most Likely): A faulty injector on cylinder #2 is the prime suspect. It could be:
* Stuck Open: The injector is constantly spraying fuel, even when it shouldn't be. This is the most likely scenario given your description.
* Faulty Spray Pattern: While less likely to cause *only* one cylinder to flood, a poorly spraying injector might deliver a significantly larger amount of fuel to cylinder #2 than the others.
* Fuel Rail Pressure Regulator: Although less common, a faulty fuel pressure regulator could be causing excessive pressure in the fuel rail, leading to one or more injectors over-fueling. If it's failing, it might disproportionately affect one cylinder.
* Wiring/Electrical Problems:
* Injector Wiring Harness: Check the wiring harness connected to cylinder #2's injector for shorts, breaks, or poor connections. A short could create a constant "on" signal to the injector.
* ECM (Engine Control Module): In a less likely scenario, a faulty ECM could be sending incorrect signals to the injector for cylinder #2. This is typically diagnosed through diagnostics.
* Intake Manifold Leak (Less Likely): While less likely to cause only one cylinder to flood, a significant vacuum leak in the intake manifold *near* cylinder #2 could impact its air/fuel mixture, potentially making it overly rich.
Troubleshooting Steps:
1. Visual Inspection: Carefully inspect the injector and its wiring harness for any obvious damage or loose connections.
2. Fuel Pressure Test: Measure fuel pressure to ensure it's within specifications. A pressure gauge connected to the fuel rail is necessary.
3. Injector Testing: Ideally, you'd need to perform an injector flow test to verify if cylinder #2's injector is delivering too much fuel. This usually requires specialized equipment.
4. Vacuum Test: Check for vacuum leaks in the intake manifold, especially around cylinder #2's intake runner.
5. OBD-II Scan: Use an OBD-II scanner to check for any diagnostic trouble codes (DTCs). While it might not pinpoint the exact injector, it could point toward a broader fuel system problem.
Important Note: Working with fuel systems requires caution. Fuel is flammable, and working on the vehicle improperly could be dangerous. If you're not comfortable performing these diagnostics and repairs yourself, take your Geo Tracker to a qualified mechanic. The cost of repair is far less than a potential fire.
