Engine Performance problem
1996 Toyota Rav4 4 cyl Two Wheel Drive Automatic 230000 miles
Hi I just replaced the oxygen sensor on my car along with new platinum plugs. The car still has a noticible skip and the engine check light sometimes will stay on and sometimes it will blink especially when I need extra power going up hill. Do I need new plug wires also? Thanks.
Check and test the following below: Oxygen Sensor
Dirty fuel injectors (cleaning the injectors often fixes this).
Bad MAP (manifold absolute pressure) sensor
Bad TPS (throttle position) sensor
Bad or dirty MAF (mass airflow) sensor
Low fuel pressure (leaky fuel pressure regulator or weak fuel pump)
Vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve)
Bad gasoline (fuel contaminated with water or too much alcohol)
Sometimes, what feels like a hesitation is actually ignition misfire rather than lean misfire. The causes of ignition misfire may include: Dirty or worn spark plugs
Bad plug wires
Weak ignition coil
Wet plug wires
Coil and Rotor