Mechanics

MISFIRE

2003 Mazda Tribute

Engine Performance problem
2003 Mazda Tribute 6 cyl Four Wheel Drive Automatic 85,000 miles

I had my car start to misfire the other day had a scan toll put on it says # 5 is misfiring replace all spark plugs wires and such complete tune-up was done. Engine light still coming on and still running the same and scan tool still says # 5 is miss firing They rplace # 5 agin incase it was faulty and still smae thing. What should I do from here?
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Zenagirl113
January 24, 2009.



Hello. Thanks for the donation. Much appreciated

I would Try checking the wires to and removing and cleaning or replacing the CKP & CMP sensor. The next options you have are replace the coil and check #5 injector is working correctly. Let me know

Except Mazda6, MPV & Tribute 3.0L
The ignition system consists of a Camshaft Position (CMP) sensor, Crankshaft Position (CKP) sensor and PCM. On B2300 pickup, Mazda6 2.3L and Tribute 2.0L, one 4-tower coil pack containing two coils is used. On B3000 and B4000 pickups, one 6-tower coil pack is used. On Miata, Protege and Protege5, ignition coils are mounted on spark plugs No. 2 and 4, and have high tension leads connected to spark plugs No. 1 and 3.
During system operation, the PCM receives information from the CKP and CMP sensors. The PCM responds with a signal containing advance or retard timing information, which is sent to fire the ignition coils.
The CKP sensor is an electromagnetic device that senses movement of a 35 tooth wheel, located behind the crankshaft pulley. Each tooth is positioned in 10 degree increments with an empty slot (missing tooth) located BTDC. Detection of the missing tooth is what enables the PCM to identify crankshaft position and initiate correct firing order.
The PCM controls spark timing and coil firing, based on information from the CKP sensor. The ignition coils, are triggered by the PCM in pairs (On 4-cylinder models, cylinders No. 1 and 4 and No. 2 and 3. On 6-cylinder models, cylinders No. 1 and 4, No. 2 and 5 and No. 3 and 6.). One plug is fired on the compression stroke; the other plug fires on the exhaust stroke. On the next cycle, firing strategy is reversed.

Crankshaft Position Sensor (2.0L). On lower left side of engine block.
Crankshaft Position Sensor (3.0L). On front of engine block.

Fuel Injectors
The PCM controls fuel injector " on" time (pulse width) to meter fuel quantity into the intake ports. The PCM receives inputs from several engine sensors to compute fuel flow necessary to maintain correct air/fuel operation throughout engine operating range.
Each cylinder has a solenoid-operated injector that sprays fuel toward each intake valve. Each injector receives battery voltage from the main relay. A PCM-controlled ground circuit is used to complete the circuit and energize the injector. Fuel injectors " fire" sequentially (in engine firing order) once per complete cycle.
Injectors consist of solenoid-actuated pintle and needle valve assembly. The amount of fuel delivered to the engine is regulated by length of time the solenoid is energized (pulse width). The atomized spray pattern is obtained by the shape of the injector pintle.

Camshaft Position (CMP) Sensor
The CMP sensor detects camshaft angle at 180-degree intervals (4-cylinder) or 120-degree intervals (6-cylinder) and sends a signal to the PCM. The CMP sensor also detects cylinder No. 1 TDC (4-cylinder) or No. 1 and No. 4 TDC (6-cylinder) and sends a signal to the PCM. The CMP signal is used for fuel synchronization. For CMP sensor location, see CAMSHAFT POSITION SENSOR LOCATIONS table. On MPV, the CMP sensor pulses once per camshaft revolution. On Mazda6 3.0L, 2 CMP sensors are used.

Tribute CMP sensor location
2.0L. Right Rear Of Engine
3.0L. Front Of Left Cylinder Head

Dave H
Jan 25, 2009.