CPI (Central Port Injection)
* Stalling: A bad CPI can cause the engine to stall, especially when idling or at low speeds.
* Hesitation: A bad CPI can also cause the engine to hesitate when accelerating.
* Rough idling: A bad CPI can cause the engine to idle roughly.
* Strong odor: A bad CPI can cause the engine to emit a strong odor of raw fuel.
* Poor gas mileage: A bad CPI can also cause the engine to get poor gas mileage.
EGR (Exhaust Gas Recirculation) Valve
* Stalling: A bad EGR valve can also cause the engine to stall, especially when idling or at low speeds.
* Hesitation: A bad EGR valve can also cause the engine to hesitate when accelerating.
* Rough idling: A bad EGR valve can also cause the engine to idle roughly.
* Pinging or knocking: A bad EGR valve can also cause the engine to ping or knock.
* Poor gas mileage: A bad EGR valve can also cause the engine to get poor gas mileage.
To test the CPI, you can use a scan tool to check the fuel pressure. The fuel pressure should be between 41 and 47 psi. You can also check the fuel injectors by spraying them with a can of carburetor cleaner. If the injectors are clogged, the engine will run rough or stall.
To test the EGR valve, you can use a scan tool to check the EGR valve position. The EGR valve should be open at idle and closed at high speeds. You can also check the EGR valve by disconnecting the vacuum hose. If the engine runs better with the vacuum hose disconnected, the EGR valve is bad.
If you are not sure if the CPI or EGR valve is bad, you can take your vehicle to a mechanic for diagnosis.
