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marcy

marcy 6/30/2012

1999 Mazda Miata 10th Anniversary 4 Cyl 1.8L

Engine

why does my car hesitate when i step on the gas. this happens after sitting at a stop light for a few minutes.

the check engine light is not on. it is quirky...never know when it is going to act up. and it is driving me nuts.

1 Answer


Jimm

Jimm 7/1/2012

First step - have the check engine scanned - for free - at any local auto parts store, such as; Advance Auto, Auto Zone, NAPA. The stored fault code will give specific information about the component to check or repair to perform.
Then, post a reply with the specific code to Auto MD for further assistance.

Possible Causes of Engine Hesitation or Stumble:

Dirty fuel injectors (cleaning the injectors often fixes this).
Dirty / clogged air filter element (change the air filter)
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

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