Mechanics

HESITATION

2003 Mazda 5

Transmission problem
2003 Mazda 5 4 cyl Front Wheel Drive Automatic 72000 miles

I just bought this car and I am noticing a hesitation betwen 60 to 80 kms per hr. At around 2000 rpms. It feels like it can't change smothly into the next gear?
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Sushimama
July 27, 2008.



Possible Causes of Engine Hesitation

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

Rasmataz
Jul 27, 2008.