Mechanics

FIRING ORDER

1998 Pontiac Montana

1998 Pontiac Montana 6 cyl Two Wheel Drive Automatic

hello.
I need a firing order for my pontiac montana. We did a diagnostic test and all it said was random misfire.
so will that be the problem for my van?
it'll do slight jerks when accelerated and less power than usual. But engine turns with no problem.
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Sidekik09
February 22, 2009.




http://www.2carpros.com/forum/automotive_pictures/12900_fo_38.jpg



Jerking could be caused by the following

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
Feb 22, 2009.