Mechanics

ENGINE SKIPPING ON HIGHWAY

1991 Ford Escort

Engine Performance problem
1991 Ford Escort 4 cyl Two Wheel Drive Manual 85000 miles

Cars skips on the highway, not around town. No trouble lights. Otherwise starts and runs OK. Where do I begin?
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Lennoman58
July 13, 2009.




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 13, 2009.


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